New Root Certificate Installed Via CertMgr.EXE
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About the rule
Rule Type
Standard
Rule Description
Detects execution of "certmgr" with the "add" 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 "\CertMgr.exe" OR ORIGINALFILENAME = "CERTMGT.EXE") AND (COMMANDLINE contains "/add" 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
