Part of .NET
regasm.exe /U AllTheThingsx64.dll
Loads the target .DLL file and executes the UnRegisterClass function.
Execute code and bypass Application whitelisting
C:\Windows\Microsoft.NET\Framework\v2.0.50727\regasm.exe, C:\Windows\Microsoft.NET\Framework64\v2.0.50727\regasm.exe, C:\Windows\Microsoft.NET\Framework\v4.0.30319\regasm.exe, C:\Windows\Microsoft.NET\Framework64\v4.0.30319\regasm.exe
Sigma: https://github.com/SigmaHQ/sigma/blob/6312dd1d44d309608552105c334948f793e89f48/rules/windows/process_creation/proc_creation_win_lolbin_regasm.yml, Elastic: https://github.com/elastic/detection-rules/blob/12577f7380f324fcee06dab3218582f4a11833e7/rules/windows/execution_register_server_program_connecting_to_the_internet.toml, Splunk: https://github.com/splunk/security_content/blob/bc93e670f5dcb24e96fbe3664d6bcad92df5acad/docs/_stories/suspicious_regsvcs_regasm_activity.md, Splunk: https://github.com/splunk/security_content/blob/bee2a4cefa533f286c546cbe6798a0b5dec3e5ef/detections/endpoint/detect_regasm_with_network_connection.yml, IOC: regasm.exe executing dll file
Casey Smith (@subtee)