Kerberos Traffic from Unusual Processedit

Identifies network connections to the standard Kerberos port from an unusual process. On Windows, the only process that normally performs Kerberos traffic from a domain joined host is lsass.exe.

Rule type: eql

Rule indices:

  • winlogbeat-*
  • logs-windows.*

Severity: medium

Risk score: 47

Runs every: 5m

Searches indices from: now-9m (Date Math format, see also Additional look-back time)

Maximum alerts per execution: 100

References: None


  • Elastic
  • Host
  • Windows
  • Threat Detection
  • Credential Access

Version: 5

Rule authors:

  • Elastic

Rule license: Elastic License v2

Rule queryedit

network where event.type == "start" and network.direction : ("outgoing", "egress") and
 destination.port == 88 and source.port >= 49152 and
 process.executable != "C:\\Windows\\System32\\lsass.exe" and destination.address !="" and destination.address !="::1" and
 /* insert false positives here */
 not in ("swi_fc.exe", "fsIPcam.exe", "IPCamera.exe", "MicrosoftEdgeCP.exe", "MicrosoftEdge.exe", "iexplore.exe", "chrome.exe", "msedge.exe", "opera.exe", "firefox.exe")