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Description

This analytic is to look for suspicious registry modification related to file compression color and information tips. This IOC was seen in hermetic wiper where it has a thread that will create this registry entry to change the color of compressed or encrypted files in NTFS file system as well as the pop up information tips. This is a good indicator that a process tries to modified one of the registry GlobalFolderOptions related to file compression attribution in terms of color in NTFS file system.

  • Type: TTP
  • Product: Splunk Enterprise, Splunk Enterprise Security, Splunk Cloud
  • Datamodel: Endpoint
  • Last Updated: 2022-03-02
  • Author: Teoderick Contreras, Splunk
  • ID: b7548c2e-9a10-11ec-99e3-acde48001122

Annotations

ATT&CK
ID Technique Tactic
T1112 Modify Registry Defense Evasion
Kill Chain Phase
  • Exploitation
NIST
  • DE.CM
CIS20
  • CIS 3
  • CIS 5
  • CIS 16
CVE 
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| tstats `security_content_summariesonly` count from datamodel=Endpoint.Registry where Registry.registry_path = "*\\Microsoft\\Windows\\CurrentVersion\\Explorer\\Advanced*" AND Registry.registry_value_name  IN("ShowCompColor", "ShowInfoTip") 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 
| `windows_modify_show_compress_color_and_info_tip_registry_filter`

Macros

The SPL above uses the following Macros:

Note that windows_modify_show_compress_color_and_info_tip_registry_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.registry_value_name
  • Registry.dest Registry.user

How To Implement

To successfully implement this search you need to be ingesting information on process that include the name of the Filesystem responsible for the changes from your endpoints into the Endpoint datamodel in the Processes and Registry node.

Known False Positives

unknown

Associated Analytic story

RBA

Risk Score Impact Confidence Message
25.0 50 50 Registry modification in “ShowCompColor” and “ShowInfoTips” on $dest$

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: 1