Potentially Suspicious Azure Front Door Connection
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About the rule
Rule Type
Standard
Rule Description
Detects connections with Azure Front Door (known legitimate service that can be leveraged for C2) that fall outside of known benign behavioral baseline (not using common apps or common azurefd.net endpoints)
Severity
Trouble
Rule Requirement
Criteria
Action1: actionname = "sa_network_connection" AND DESTINATIONHOST contains "azurefd.net" AND (PROCESSNAME notendswith "brave.exe,chrome.exe,chromium.exe,firefox.exe,msedge.exe,msedgewebview2.exe,opera.exe,vivaldi.exe" AND PROCESSNAME notendswith "searchapp.exe" AND DESTINATIONHOST notcontains "afdxtest.z01.azurefd.net,fp-afd.azurefd.net,fp-afdx-bpdee4gtg6frejfd.z01.azurefd.net,roxy.azurefd.net,powershellinfraartifacts-gkhedzdeaghdezhr.z01.azurefd.net,storage-explorer-publishing-feapcgfgbzc2cjek.b01.azurefd.net,graph.azurefd.net") 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
Isaac Dunham
