Suspicious FromBase64String Usage On Gzip Archive - Process Creation
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About the rule
Rule Type
Standard
Rule Description
Detects attempts of decoding a base64 Gzip archive via PowerShell. This technique is often used as a method to load malicious content into memory afterward.
Severity
Trouble
Rule Requirement
Criteria
Action1: actionname = "Process started" AND COMMANDLINE contains "FromBase64String" AND COMMANDLINE contains "MemoryStream" AND COMMANDLINE contains "H4sI" select Action1.HOSTNAME,Action1.MESSAGE,Action1.COMMANDLINE,Action1.FILE_NAME,Action1.PROCESSNAME,Action1.USERNAME,Action1.PARENTPROCESSNAME
Detection
Execution Mode
realtime
Log Sources
Windows
Author
frack113
