Untrusted Driver Loaded

Last updated 11 days ago on 2026-05-01

Created 3 years ago on 2023-01-27

About

Identifies an untrusted driver loaded by the Windows kernel. Adversaries may modify code signing policies to enable execution of unsigned or self-signed kernel code.

Tags

Domain: EndpointOS: WindowsUse Case: Threat DetectionTactic: Defense EvasionData Source: Elastic DefendLanguage: eql

Severity

high

Risk Score

MITRE ATT&CK™

Defense Evasion (TA0005)(external, opens in a new tab or window)

↳ Masquerading (T1036)(external, opens in a new tab or window)

License

Elastic License v2(external, opens in a new tab or window)

Definition

Rule Type: Event Correlation Rule
Integration Pack: Prebuilt Security Detection Rules
Index Patterns: logs-endpoint.events.library-*
Related Integrations: endpoint(external, opens in a new tab or window)
Query

✄𐘗text code block:
✄𐘗driver where host.os.type == "windows" and process.pid == 4 and
  (dll.code_signature.trusted == false or dll.code_signature.exists == false) and
  /* errorExpired and errorRevoked are handled by d12bac54-ab2a-4159-933f-d7bcefa7b61d */
  not dll.code_signature.status : ("errorExpired", "errorRevoked", "errorCode_endpoint:*") and
  
  /* HP DOT4 printer driver family FPs (Dot4.sys, Dot4Prt.sys, Dot4usb.sys, Dot4Scan.sys) */
  not dll.hash.sha256 : (
        "f21c1d478180bc5e932bb2c2e4618e3ed463ca87acedeb139682d218435f82f1",
        "7e2f2a139e897eae56038b920bda9381094bc0ae9e626f6634e6b444b8b0c91f",
        "12ffdf5f48a79b1b4adbb88ba2cb6c59dd6719554e8ea6beefe99b3e3c66f1ac",
        "dbc6afaf80141e2480e19878f581edfe9c2b018da2ec527c4025ff04d5587afd"
  )

Install detection rules in Elastic Security

Detect Untrusted Driver Loaded in the Elastic Security detection engine by installing this rule into your Elastic Stack.

To setup this rule, check out the installation guide for Prebuilt Security Detection Rules(external, opens in a new tab or window).