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Description

This search looks for registry activity associated with application compatibility shims, which can be leveraged by attackers for various nefarious purposes.

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

  • Last Updated: 2020-01-28
  • Author: Bhavin Patel, Patrick Bareiss, Teoderick Contreras, Splunk
  • ID: f5f6af30-7aa7-4295-bfe9-07fe87c01bbb

Annotations

ATT&CK
ID Technique Tactic
T1546.011 Application Shimming Persistence, Privilege Escalation
T1546 Event Triggered Execution Persistence, Privilege Escalation
Kill Chain Phase
  • Actions on Objectives
NIST
  • PR.PT
  • DE.CM
CIS20
  • CIS 8
CVE
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| tstats `security_content_summariesonly` count FROM datamodel=Endpoint.Registry where Registry.registry_path=*CurrentVersion\\AppCompatFlags\\Custom* OR Registry.registry_path=*CurrentVersion\\AppCompatFlags\\InstalledSDB* by _time span=1h Registry.dest Registry.user Registry.registry_path Registry.registry_value_name Registry.registry_value_data Registry.process_guid 
| `drop_dm_object_name(Registry)` 
|rename process_guid as proc_guid 
|join proc_guid, _time [
| tstats `security_content_summariesonly` count FROM datamodel=Endpoint.Processes by _time span=1h Processes.process_id Processes.process_name Processes.process Processes.dest Processes.parent_process_name Processes.parent_process Processes.process_guid 
| `drop_dm_object_name(Processes)` 
|rename process_guid as proc_guid 
| fields _time dest user parent_process_name parent_process process_name process_path process proc_guid registry_path registry_value_name registry_value_data] 
| table _time dest user parent_process_name parent_process process_name process_path process proc_guid registry_path registry_value_name registry_value_data 
| `registry_keys_for_creating_shim_databases_filter`

Macros

The SPL above uses the following Macros:

Note that registry_keys_for_creating_shim_databases_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
  • Registry.registry_key_name
  • Registry.registry_path
  • Registry.dest
  • Registry.user

How To Implement

To successfully implement this search, you must populate the Change_Analysis data model. This is typically populated via endpoint detection and response product, such as Carbon Black or other 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

There are many legitimate applications that leverage shim databases for compatibility purposes for legacy applications

Associated Analytic story

RBA

Risk Score Impact Confidence Message
56.0 70 80 A registry activity in $registry_path$ related to shim modication 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: 4