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Description

The search looks for reg.exe modifying registry keys that define Windows services and their configurations.

  • Type: TTP
  • Product: Splunk Enterprise, Splunk Enterprise Security, Splunk Cloud
  • Datamodel: Endpoint- Datasource: Splunk Add-on for Sysmon
  • Last Updated: 2020-11-26
  • Author: Rico Valdez, Splunk
  • ID: 8470d755-0c13-45b3-bd63-387a373c10cf

Annotations

ATT&CK
ID Technique Tactic
T1574.011 Services Registry Permissions Weakness Defense Evasion, Persistence, Privilege Escalation
T1574 Hijack Execution Flow Defense Evasion, Persistence, Privilege Escalation
Kill Chain Phase
  • Installation
NIST
  • PR.IP
  • PR.PT
  • PR.AC
  • PR.AT
  • DE.CM
CIS20
  • CIS 3
  • CIS 5
  • CIS 8
CVE
1
2
3
4
5
6
| tstats `security_content_summariesonly` count min(_time) as firstTime max(_time) as lastTime values(Processes.process_name) as process_name values(Processes.parent_process_name) as parent_process_name values(Processes.user) as user FROM datamodel=Endpoint.Processes where Processes.process_name=reg.exe Processes.process=*reg* Processes.process=*add* Processes.process=*Services* by Processes.process_id Processes.dest Processes.process 
| `drop_dm_object_name("Processes")` 
| `security_content_ctime(firstTime)` 
| `security_content_ctime(lastTime)` 
| `reg_exe_manipulating_windows_services_registry_keys_filter`

Macros

The SPL above uses the following Macros:

Note that reg_exe_manipulating_windows_services_registry_keys_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.process_name
  • Processes.parent_process_name
  • Processes.user
  • Processes.process
  • Processes.process_id
  • Processes.dest

How To Implement

To successfully implement this search, you must be ingesting data that records registry activity from your hosts to populate the endpoint data model in the registry node. This is typically populated via endpoint detection-and-response product, such as Carbon Black or endpoint data sources, such as Sysmon. The data used for this search is typically generated via logs that report reads and writes to the registry.

Known False Positives

It is unusual for a service to be created or modified by directly manipulating the registry. However, there may be legitimate instances of this behavior. It is important to validate and investigate, as appropriate.

Associated Analytic story

RBA

Risk Score Impact Confidence Message
45.0 75 60 A reg.exe process $process_name$ with commandline $process$ in host $dest$

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: 5