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Description

This analytic will detect suspicious driver loaded paths. This technique is commonly used by malicious software like coin miners (xmrig) to register its malicious driver from notable directories where executable or drivers do not commonly exist. During triage, validate this driver is for legitimate business use. Review the metadata and certificate information. Unsigned drivers from non-standard paths is not normal, but occurs. In addition, review driver loads into ntoskrnl.exe for possible other drivers of interest. Long tail analyze drivers by path (outside of default, and in default) for further review.

  • Type: TTP

  • Product: Splunk Enterprise, Splunk Enterprise Security, Splunk Cloud

  • Last Updated: 2021-04-29
  • Author: Teoderick Contreras, Splunk
  • ID: f880acd4-a8f1-11eb-a53b-acde48001122

Annotations

ATT&CK

ATT&CK

ID Technique Tactic
T1543.003 Windows Service Persistence, Privilege Escalation
T1543 Create or Modify System Process Persistence, Privilege Escalation
Kill Chain Phase
  • Installation
  • Exploitation
NIST
  • DE.CM
CIS20
  • CIS 10
CVE 


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`sysmon` EventCode=6 ImageLoaded = "*.sys" NOT (ImageLoaded IN("*\\WINDOWS\\inf","*\\WINDOWS\\System32\\drivers\\*", "*\\WINDOWS\\System32\\DriverStore\\FileRepository\\*")) 
|  stats  min(_time) as firstTime max(_time) as lastTime count by Computer ImageLoaded Hashes IMPHASH Signature Signed 
| `security_content_ctime(firstTime)` 
| `security_content_ctime(lastTime)` 
| `suspicious_driver_loaded_path_filter`

Macros

The SPL above uses the following Macros:

:information_source: suspicious_driver_loaded_path_filter is a empty macro by default. It allows the user to filter out any results (false positives) without editing the SPL.

Required fields

List of fields required to use this analytic.

  • _time
  • Computer
  • ImageLoaded
  • Hashes
  • IMPHASH
  • Signature
  • Signed

How To Implement

To successfully implement this search, you need to be ingesting logs with the driver loaded and Signature from your endpoints. If you are using Sysmon, you must have at least version 6.0.4 of the Sysmon TA.

Known False Positives

Limited false positives will be present. Some applications do load drivers

Associated Analytic Story

RBA

Risk Score Impact Confidence Message
63.0 70 90 Suspicious driver $ImageLoaded$ on $Computer$

:information_source: The Risk Score is calculated by the following formula: Risk Score = (Impact * Confidence/100). Initial Confidence and Impact is set by the analytic author.

Reference

Test Dataset

Replay any dataset to Splunk Enterprise by using our replay.py tool or the UI. Alternatively you can replay a dataset into a Splunk Attack Range

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