Authorization Plugin Modification

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: 101

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/