Getuidx64 Require Administrator Privileges ◉

Since the operation requires Administrator privileges, the user is already trusted by the OS. Therefore, standard permission models fail here. Detection must focus on behavior.

First, it’s important to clarify that getuidx64 is not a standard Windows API call. Windows uses functions like GetCurrentProcessId() or GetTokenInformation() to retrieve user identities. Instead, getuidx64 likely appears in:

The x64 suffix explicitly denotes a 64-bit implementation or context.

If getuidx64 comes from Cygwin, MSYS2, or a similar package, reinstalling can replace broken binary files. getuidx64 require administrator privileges

getuidx64 is almost certainly a custom function or a symbol exported from a third-party library, typically written in C/C++ or Delphi, compiled for 64-bit architectures (hence the x64 suffix). The name itself borrows from POSIX standards – getuid() (Get User ID) is a Unix/Linux system call that retrieves the real user ID of the calling process.

In a Windows context, a developer might create a getuidx64 function to:

DWORD getuidx64(UIDX64_INFO* pInfo) 
    HANDLE hToken;
    DWORD dwResult = GETUID_E_ADMIN_REQUIRED;
// Check administrator privilege
if (!IsProcessElevated()) 
    SetLastError(ERROR_ACCESS_DENIED);
    return GETUID_E_ADMIN_REQUIRED;
// Open process token
if (!OpenProcessToken(GetCurrentProcess(), TOKEN_QUERY, &hToken)) 
    return GETUID_E_ACCESS_DENIED;
// Retrieve SID, user info, session, integrity level
// ... (implementation details)
CloseHandle(hToken);
return GETUID_SUCCESS;

Granting administrator privileges to any software is not a trivial decision. Here is what you risk when you elevate an application that triggers getuidx64:

| Type of Risk | Description | |--------------|-------------| | Privilege Escalation | If the application is malicious, it can install rootkits, steal SAM hashes, or disable security software. | | Ransomware | With admin rights, ransomware can encrypt shadow copies, map network drives, and disable recovery options. | | Persistent Backdoors | Admin access allows installation of scheduled tasks or services that survive reboots. | | Accidental System Damage | Even non-malicious but buggy software can delete critical system files or corrupt registry hives when running at high integrity levels. | The x64 suffix explicitly denotes a 64-bit implementation

Best Practice: Before clicking "Yes" on the UAC prompt, ask yourself:

If the answer to any of the above is "no," consider running the software in a sandbox (e.g., Windows Sandbox, Sandboxie) or a virtual machine.