Potentially Suspicious Command Executed Via Run Dialog Box - Registry
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About the rule
Rule Type
Standard
Rule Description
Detects execution of commands via the run dialog box on Windows by checking values of the "RunMRU" registry key. This technique was seen being abused by threat actors to deceive users into pasting and executing malicious commands, often disguised as CAPTCHA verification steps.
Severity
Trouble
Rule Requirement
Criteria
Action1: actionname = "Registry value modified" AND (OBJECTNAME contains "\Microsoft\Windows\CurrentVersion\Explorer\RunMRU" OR (OBJECTNAME endswith "\Microsoft\Windows\CurrentVersion\Explorer" AND OBJECTVALUENAME startswith "RunMRU")) AND ((INFORMATION contains "powershell,pwsh" AND INFORMATION contains " -e , -ec , -en , -enc , -enco,ftp,Hidden,http,iex,Invoke-") OR (INFORMATION contains "wmic" AND INFORMATION contains "shadowcopy,process call create")) select Action1.HOSTNAME,Action1.MESSAGE,Action1.OBJECTNAME,Action1.PROCESSNAME,Action1.PREVVAL,Action1.CHANGES
Detection
Execution Mode
realtime
Log Sources
Windows
Author
Ahmed Farouk, Nasreddine Bencherchali
