Kirbi File Creation

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Identifies the creation of .kirbi files. The creation of this kind of file is an indicator of an attacker running Kerberos ticket dump utilities, such as Mimikatz, and precedes attacks such as Pass-The-Ticket (PTT), which allows the attacker to impersonate users using Kerberos tickets.

Rule type: eql

Rule indices:

  • logs-endpoint.events.*
  • logs-windows.sysmon_operational-*

Severity: medium

Risk score: 47

Runs every: 60m

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

Maximum alerts per execution: 100

References: None

Tags:

  • Domain: Endpoint
  • OS: Windows
  • Use Case: Threat Detection
  • Tactic: Credential Access
  • Data Source: Elastic Defend
  • Data Source: Sysmon

Version: 4

Rule authors:

  • Elastic

Rule license: Elastic License v2

Rule query

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file where host.os.type == "windows" and event.type == "creation" and file.extension : "kirbi"

Framework: MITRE ATT&CKTM