Ruby Inline Command Execution

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About the rule

Rule Type

Standard

Rule Description

Detects execution of ruby using the "-e" flag. This is could be used as a way to launch a reverse shell or execute live ruby code.

Severity

Trouble

Rule Requirement

Criteria

Action1: actionname = "Process started" AND (PROCESSNAME endswith "\ruby.exe" OR ORIGINALFILENAME = "ruby.exe") AND COMMANDLINE contains " -e" select Action1.HOSTNAME,Action1.MESSAGE,Action1.COMMANDLINE,Action1.FILE_NAME,Action1.PROCESSNAME,Action1.USERNAME,Action1.PARENTPROCESSNAME

Detection

Execution Mode

realtime

Log Sources

Windows

Author

Nasreddine Bencherchali (Nextron Systems)