PowerShell Base64 Encoded FromBase64String Cmdlet
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About the rule
Rule Type
Standard
Rule Description
Detects usage of a base64 encoded "FromBase64String" cmdlet in a process command line
Severity
Trouble
Rule Requirement
Criteria
Action1:
actionname = "Process started" AND COMMANDLINE contains "OjpGcm9tQmFzZTY0U3RyaW5n,o6RnJvbUJhc2U2NFN0cmluZ,6OkZyb21CYXNlNjRTdHJpbm" OR COMMANDLINE contains "OgA6AEYAcgBvAG0AQgBhAHMAZQA2ADQAUwB0AHIAaQBuAGcA,oAOgBGAHIAbwBtAEIAYQBzAGUANgA0AFMAdAByAGkAbgBnA,6ADoARgByAG8AbQBCAGEAcwBlADYANABTAHQAcgBpAG4AZw"
select Action1.HOSTNAME,Action1.MESSAGE,Action1.COMMANDLINE,Action1.FILE_NAME,Action1.PROCESSNAME,Action1.USERNAME,Action1.PARENTPROCESSNAME,Action1.DOMAIN,Action1.ORIGINALFILENAME,Action1.PARENTPROCESSID,Action1.PROCESSID,Action1.PRODUCT_NAME,Action1.SECURITYID
Detection
Execution Mode
realtime
Log Sources
Windows
Author
Florian Roth (Nextron Systems)
