Untrusted Driver Loaded

Elastic Stack Serverless Security

Identifies attempt to load an untrusted driver. Adversaries may modify code signing policies to enable execution of unsigned or self-signed code.

Rule type: eql

Rule indices:

• 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/hfiref0x/TDL
• https://docs.microsoft.com/en-us/previous-versions/windows/hardware/design/dn653559(v=vs.85)?redirectedfrom=MSDN

Tags:

• Elastic
• Host
• macOS
• Threat Detection
• Defense Evasion

Version: 1

Rule authors:

• Elastic

Rule license: Elastic License v2

library where process.pid == 4 and
  dll.code_signature.trusted != true and
  not dll.code_signature.status : ("errorExpired", "errorRevoked")

Framework: MITRE ATT&CKTM

• Tactic:

  • Name: Defense Evasion
  • ID: TA0005
  • Reference URL: https://attack.mitre.org/tactics/TA0005/

• Technique:

  • Name: Subvert Trust Controls
  • ID: T1553
  • Reference URL: https://attack.mitre.org/techniques/T1553/

• Sub-technique:

  • Name: Code Signing Policy Modification
  • ID: T1553.006
  • Reference URL: https://attack.mitre.org/techniques/T1553/006/