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Description

The following analytic identifes a new kernel driver being added to Windows using sc.exe. Adding a Kernel driver is not common day to day and should be investigated to further understand the source.

  • Type: TTP
  • Product: Splunk Enterprise, Splunk Enterprise Security, Splunk Cloud
  • Datamodel: Endpoint
  • Last Updated: 2022-05-05
  • Author: Michael Haag, Splunk
  • ID: 0b4e3b06-1b2b-4885-b752-cf06d12a90cb

Annotations

ATT&CK
ID Technique Tactic
T1543.003 Windows Service Persistence, Privilege Escalation
T1543 Create or Modify System Process Persistence, Privilege Escalation
T1068 Exploitation for Privilege Escalation Privilege Escalation
Kill Chain Phase
  • Installation
NIST
  • DE.CM
CIS20
  • CIS 3
  • CIS 5
  • CIS 16
CVE
1
2
3
4
5
6
| tstats `security_content_summariesonly` count min(_time) as firstTime max(_time) as lastTime from datamodel=Endpoint.Processes where Processes.process_name=sc.exe Processes.process="*kernel*" by Processes.dest Processes.user Processes.parent_process_name Processes.process_name Processes.process Processes.process_id Processes.parent_process_id 
| `drop_dm_object_name(Processes)` 
| `security_content_ctime(firstTime)` 
| `security_content_ctime(lastTime)` 
| `windows_service_create_kernel_mode_driver_filter`

Macros

The SPL above uses the following Macros:

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

Required field

  • _time
  • Processes.dest
  • Processes.user
  • Processes.original_file_name
  • Processes.process_name
  • Processes.process
  • Processes.process_id
  • Processes.parent_process_path
  • Processes.process_path
  • Processes.parent_process_id

How To Implement

To successfully implement this search you need to be ingesting information on process that include the name of the process responsible for the changes from your endpoints into the Endpoint datamodel in the Processes node. In addition, confirm the latest CIM App 4.20 or higher is installed and the latest TA for the endpoint product.

Known False Positives

False positives may be present based on common applications adding new drivers, however, filter as needed.

Associated Analytic story

RBA

Risk Score Impact Confidence Message
48.0 60 80 Service control, $process_name$, loaded a new kernel mode driver on $dest$ by $user$.

: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

source | version: 1