Suspicious FromBase64String Usage On Gzip Archive - Ps Script
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About the rule
Rule Type
Standard
Rule Description
Detects attempts of decoding a base64 Gzip archive in a PowerShell script. This technique is often used as a method to load malicious content into memory afterward.
Severity
Trouble
Rule Requirement
Criteria
Action1:
actionname = "PowerShell Script Block Logged" AND SCRIPTEXECUTED contains "FromBase64String" AND SCRIPTEXECUTED contains "MemoryStream" AND SCRIPTEXECUTED contains "H4sI"
select Action1.HOSTNAME,Action1.MESSAGE,Action1.SCRIPTEXECUTED,Action1.DOMAIN,Action1.PATH,Action1.USERNAME
Detection
Execution Mode
realtime
Log Sources
Windows
Author
frack113
