(C++) Heap Flag by External

Created the Wednesday 22 June 2022. Updated 1 year, 9 months ago.

Description:

Original source code available here: https://anti-debug.checkpoint.com/techniques/debug-flags.html#manual-checks-heap-flags

Code

            bool Check()
{
#ifndef _WIN64
    PPEB pPeb = (PPEB)__readfsdword(0x30);
    PVOID pHeapBase = !m_bIsWow64
        ? (PVOID)(*(PDWORD_PTR)((PBYTE)pPeb + 0x18))
        : (PVOID)(*(PDWORD_PTR)((PBYTE)pPeb + 0x1030));
    DWORD dwHeapFlagsOffset = IsWindowsVistaOrGreater()
        ? 0x40
        : 0x0C;
    DWORD dwHeapForceFlagsOffset = IsWindowsVistaOrGreater()
        ? 0x44 
        : 0x10;
#else
    PPEB pPeb = (PPEB)__readgsqword(0x60);
    PVOID pHeapBase = (PVOID)(*(PDWORD_PTR)((PBYTE)pPeb + 0x30));
    DWORD dwHeapFlagsOffset = IsWindowsVistaOrGreater()
        ? 0x70 
        : 0x14;
    DWORD dwHeapForceFlagsOffset = IsWindowsVistaOrGreater()
        ? 0x74 
        : 0x18;
#endif // _WIN64

    PDWORD pdwHeapFlags = (PDWORD)((PBYTE)pHeapBase + dwHeapFlagsOffset);
    PDWORD pdwHeapForceFlags = (PDWORD)((PBYTE)pHeapBase + dwHeapForceFlagsOffset);
    return (*pdwHeapFlags & ~HEAP_GROWABLE) || (*pdwHeapForceFlags != 0);
}

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