New Root Certificate Installed Via Certutil.EXE
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About the rule
Rule Type
Standard
Rule Description
Detects execution of "certutil" with the "addstore" flag in order to install a new certificate on the system. Adversaries may install a root certificate on a compromised system to avoid warnings when connecting to adversary controlled web servers.
Severity
Trouble
Rule Requirement
Criteria
Action1: actionname = "Process started" AND (PROCESSNAME endswith "\certutil.exe" OR ORIGINALFILENAME = "CertUtil.exe") AND COMMANDLINE contains "-addstore,/addstore,–addstore,—addstore,―addstore" AND COMMANDLINE contains "root" select Action1.HOSTNAME,Action1.MESSAGE,Action1.COMMANDLINE,Action1.FILE_NAME,Action1.PROCESSNAME,Action1.USERNAME,Action1.PARENTPROCESSNAME
Detection
Execution Mode
realtime
Log Sources
Windows
Author
oscd.community, @redcanary, Zach Stanford @svch0st
