DLL Execution via Rasautou.exe
This rule detects the use of 'rasautou.exe' to load and execute arbitrary DLLs. Adversaries can leverage 'rasautou.exe', a legitimate Windows utility, to proxy execution of malicious DLLs by specifying the DLL path with the '-d' option and an export function with the '-p' option. This technique is often used for defense evasion and to bypass application whitelisting. The rule specifically looks for the execution of 'rasautou.exe' or 'rasdlui.exe' with both '-d' and '-p' command-line arguments. This method is primarily relevant for Windows versions prior to Windows 10, as the '-d' and '-p' options were removed in later versions. For effective detection on Windows 7, Sysmon or KB3004375 for command-line auditing is required.
Sigma
