Testing Usage of Uncommonly Used Port
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About the rule
Rule Type
Standard
Rule Description
Adversaries may communicate using a protocol and port paring that are typically not associated. For example, HTTPS over port 8088(Citation: Symantec Elfin Mar 2019) or port 587(Citation: Fortinet Agent Tesla April 2018) as opposed to the traditional port 443.
Severity
Trouble
Rule Requirement
Criteria
Action1:
actionname = "PowerShell Script Block Logged" AND (SCRIPTEXECUTED contains "Test-NetConnection" AND SCRIPTEXECUTED contains "-ComputerName " AND SCRIPTEXECUTED contains "-port ") AND SCRIPTEXECUTED notcontains " 443 , 80 "
select Action1.HOSTNAME,Action1.MESSAGE,Action1.SCRIPTEXECUTED,Action1.DOMAIN,Action1.PATH,Action1.USERNAME
Detection
Execution Mode
realtime
Log Sources
Windows
Author
frack113
