PUA - NirCmd Execution

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About the rule

Rule Type

Standard

Rule Description

Detects the use of NirCmd tool for command execution, which could be the result of legitimate administrative activity

Severity

Trouble

Rule Requirement

Criteria

Action1: actionname = "Process started" AND ((PROCESSNAME endswith "\NirCmd.exe" OR ORIGINALFILENAME = "NirCmd.exe") OR COMMANDLINE contains " execmd ,.exe script ,.exe shexec , runinteractive ") OR (COMMANDLINE contains " exec , exec2 " AND COMMANDLINE contains " show , hide ") select Action1.HOSTNAME,Action1.MESSAGE,Action1.COMMANDLINE,Action1.FILE_NAME,Action1.PROCESSNAME,Action1.USERNAME,Action1.PARENTPROCESSNAME

Detection

Execution Mode

realtime

Log Sources

Windows

Author

Florian Roth (Nextron Systems), Nasreddine Bencherchali (Nextron Systems)