Base64 Encoded PowerShell Command Detected

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About the rule

Rule Type

Standard

Rule Description

Detects usage of the "FromBase64String" function in the commandline which is used to decode a base64 encoded string

Severity

Trouble

Rule Requirement

Criteria

Action1: actionname = "Process started" AND COMMANDLINE contains "::FromBase64String(" 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)