Authorization Plugin Modification

Elastic Stack Serverless Security

Authorization plugins are used to extend the authorization services API and implement mechanisms that are not natively supported by the OS, such as multi-factor authentication with third party software. Adversaries may abuse this feature to persist and/or collect clear text credentials as they traverse the registered plugins during user logon.

Rule type: query

Rule indices:

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

Severity: medium

Risk score: 47

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://developer.apple.com/documentation/security/authorization_plug-ins
• https://www.xorrior.com/persistent-credential-theft/

Tags:

• Elastic
• Host
• macOS
• Threat Detection
• Persistence

Version: 3

Rule authors:

• Elastic

Rule license: Elastic License v2

event.category:file and not event.type:deletion and
  file.path:(/Library/Security/SecurityAgentPlugins/* and
  not /Library/Security/SecurityAgentPlugins/TeamViewerAuthPlugin.bundle/*) and
  not process.name:shove and process.code_signature.trusted:true

Framework: MITRE ATT&CKTM

• Tactic:

  • Name: Persistence
  • ID: TA0003
  • Reference URL: https://attack.mitre.org/tactics/TA0003/

• Technique:

  • Name: Boot or Logon Autostart Execution
  • ID: T1547
  • Reference URL: https://attack.mitre.org/techniques/T1547/

• Sub-technique:

  • Name: Authentication Package
  • ID: T1547.002
  • Reference URL: https://attack.mitre.org/techniques/T1547/002/