Kerberos Traffic from Unusual Process

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:

logs-endpoint.events.*
winlogbeat-*
logs-windows.*

Severity: medium

Risk score: 47

Runs every: 5 minutes

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

Maximum alerts per execution: 100

Tags:

Elastic
Host
Windows
Threat Detection
Credential Access

Version: 4 (version history)

Added (Elastic Stack release): 7.11.0

Last modified (Elastic Stack release): 7.16.0

Rule authors: Elastic

Rule license: Elastic License v2

Potential false positives

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HTTP traffic on a non standard port. Verify that the destination IP address is not related to a Domain Controller.

Rule query

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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 !="127.0.0.1" and destination.address !="::1"
and /* insert False Positives here */ not process.name in
("swi_fc.exe", "fsIPcam.exe", "IPCamera.exe", "MicrosoftEdgeCP.exe",
"MicrosoftEdge.exe", "iexplore.exe", "chrome.exe", "msedge.exe",
"opera.exe", "firefox.exe")

Threat mapping

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Framework: MITRE ATT&CK^TM

Tactic:
- Name: Credential Access
- ID: TA0006
- Reference URL: https://attack.mitre.org/tactics/TA0006/
Technique:
- Name: Steal or Forge Kerberos Tickets
- ID: T1558
- Reference URL: https://attack.mitre.org/techniques/T1558/

Rule version history

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Version 4 (7.16.0 release)

Updated query, changed from:

network where event.type == "start" and network.direction ==
"outgoing" and destination.port == 88 and source.port >= 49152 and
process.executable != "C:\\Windows\\System32\\lsass.exe" and
destination.address !="127.0.0.1" and destination.address !="::1" and
/* insert False Positives here */ not process.name in ("swi_fc.exe",
"fsIPcam.exe", "IPCamera.exe", "MicrosoftEdgeCP.exe",
"MicrosoftEdge.exe", "iexplore.exe", "chrome.exe", "msedge.exe",
"opera.exe", "firefox.exe")

Version 3 (7.12.0 release)

Formatting only

Version 2 (7.11.2 release)

Formatting only

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