Office Application Initiated Network Connection Over Uncommon Ports
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About the rule
Rule Type
Standard
Rule Description
Detects an office suit application (Word, Excel, PowerPoint, Outlook) communicating to target systems over uncommon ports.
Severity
Trouble
Rule Requirement
Criteria
Action1:
actionname = "Network Connection" AND (IS_INITIATED = "true" AND PROCESSNAME endswith "\excel.exe,\outlook.exe,\powerpnt.exe,\winword.exe,\wordview.exe") AND (DEST_PORT != "53,80,139,443,445" AND (PROCESSNAME notcontains ":\Program Files\Microsoft Office" OR PROCESSNAME notendswith "\OUTLOOK.EXE" OR DEST_PORT != "143,465,587,993,995"))
select Action1.HOSTNAME,Action1.MESSAGE,Action1.USERNAME,Action1.PROCESSNAME,Action1.DESTINATIONHOST,Action1.DESTINATION_IPV6,Action1.DEST_IP,Action1.SOURCEHOST,Action1.SOURCE_IP,Action1.SOURCE_IPV6
Detection
Execution Mode
realtime
Log Sources
Windows
Author
X__Junior (Nextron Systems), Nasreddine Bencherchali (Nextron Systems)
