The certificate is added to a specific system store (e.g., Root , CA , My , TrustedPeople ). Unlike simpler add functions, this export often defaults to the store or the Intermediate Certification Authorities store. Evidence from API monitors suggests it primarily targets the Root or CA system stores relevant to machine trust.
The function name CryptExtAddCerMachineOnlyAndHwnd is largely self-explanatory if broken down: cryptextdll cryptextaddcermachineonlyandhwnd work
The function name CryptExtAddCERMachineOnlyAndHwnd contains explicitly descriptive naming conventions that explain exactly what the command does when invoked through the Windows command execution utility, rundll32.exe . The certificate is added to a specific system store (e
HRESULT CryptExtAddCERMachineOnlyAndHwnd( HWND hWndParent, DWORD dwFlags, LPCWSTR wszFileName, // possibly additional parameters ); Automated Malware Analysis Report for root
if (pFunc) HRESULT hr = pFunc(GetDesktopWindow(), 0x00000001, L"C:\\corp-root.cer", 0); if (SUCCEEDED(hr)) MessageBoxW(NULL, L"Certificate installed to Local Machine store", L"Success", MB_OK);
: Verify that the certificate you are loading is from a verified vendor. Legitimate Windows system files located in C:\Windows\System32\ signed by Microsoft are safe.
Automated Malware Analysis Report for root.cer - Joe Sandbox