Potential Regsvr32 Commandline Flag Anomaly

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About the rule

Rule Type

Standard

Rule Description

Detects a potential command line flag anomaly related to "regsvr32" in which the "/i" flag is used without the "/n" which should be uncommon.

Severity

Trouble

Rule Requirement

Criteria

Action1: actionname = "Process started" AND (PROCESSNAME endswith "\regsvr32.exe" AND COMMANDLINE contains " -i:, /i:, –i:, —i:, ―i:") AND COMMANDLINE notcontains " -n , /n , –n , —n , ―n " 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)