Suspicious PowerShell Download and Execute Pattern
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About the rule
Rule Type
Standard
Rule Description
Detects suspicious PowerShell download patterns that are often used in malicious scripts, stagers or downloaders (make sure that your backend applies the strings case-insensitive)
Severity
Trouble
Rule Requirement
Criteria
Action1: actionname = "Process started" AND COMMANDLINE contains "IEX ((New-Object Net.WebClient).DownloadString,IEX (New-Object Net.WebClient).DownloadString,IEX((New-Object Net.WebClient).DownloadString,IEX(New-Object Net.WebClient).DownloadString, -command (New-Object System.Net.WebClient).DownloadFile(, -c (New-Object System.Net.WebClient).DownloadFile(" 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)
