Potential Kerberos Attack via Bifrost

Elastic Stack Serverless Security

Identifies use of Bifrost, a known macOS Kerberos pentesting tool, which can be used to dump cached Kerberos tickets or attempt unauthorized authentication techniques such as pass-the-ticket/hash and kerberoasting.

Rule type: query

Rule indices:

• auditbeat-*
• logs-endpoint.events.*

Severity: high

Risk score: 73

Runs every: 5m

Searches indices from: now-9m (https://www.elastic.co/guide/en/elasticsearch/reference/current/common-options.html#date-math[Date Math format], see also Additional look-back time)

Maximum alerts per execution: 100

References:

• https://github.com/its-a-feature/bifrost

Tags:

• Elastic
• Host
• macOS
• Threat Detection
• Credential Access
• Lateral Movement

Version: 2

Rule authors:

• Elastic

Rule license: Elastic License v2

event.category:process and event.type:start and
 process.args:("-action" and ("-kerberoast" or askhash or asktgs or asktgt or s4u or ("-ticket" and ptt) or (dump and (tickets or keytab))))

Framework: MITRE ATT&CKTM

• Tactic:

  • Name: Lateral Movement
  • ID: TA0008
  • Reference URL: https://attack.mitre.org/tactics/TA0008/

• Technique:

  • Name: Use Alternate Authentication Material
  • ID: T1550
  • Reference URL: https://attack.mitre.org/techniques/T1550/

• Sub-technique:

  • Name: Pass the Ticket
  • ID: T1550.003
  • Reference URL: https://attack.mitre.org/techniques/T1550/003/

• 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/

• Sub-technique:

  • Name: Kerberoasting
  • ID: T1558.003
  • Reference URL: https://attack.mitre.org/techniques/T1558/003/