splunk-security_content/docs/_posts/2021-10-18-disable_defender_mpengine_registry.md

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title	excerpt	categories	last_modified_at	toc	toc_label	tags
Disable Defender MpEngine Registry	Disable or Modify Tools, Impair Defenses	Endpoint	2021-10-18	true		Disable or Modify Tools Defense Evasion Impair Defenses Defense Evasion Splunk Enterprise Splunk Enterprise Security Splunk Cloud Endpoint

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Description

This particular behavior is typically executed when an adversaries or malware gains access to an endpoint and beings to perform execution and to evade detections. Usually, a batch (.bat) will be executed and multiple registry and scheduled task modifications will occur. During triage, review parallel processes and identify any further file modifications. Endpoint should be isolated.

• Type: TTP
• Product: Splunk Enterprise, Splunk Enterprise Security, Splunk Cloud
• Datamodel: Endpoint
• Last Updated: 2021-10-18
• Author: Teoderick Contreras, Splunk
• ID: cc391750-3024-11ec-955a-acde48001122

ATT&CK

ID	Technique	Tactic
T1562.001	Disable or Modify Tools	Defense Evasion

| T1562 | Impair Defenses | Defense Evasion |

Search

| tstats `security_content_summariesonly` count min(_time) as firstTime max(_time) as lastTime from datamodel=Endpoint.Registry where Registry.registry_path = "*\\Policies\\Microsoft\\Windows Defender\\MpEngine*" Registry.registry_value_name = MpEnablePus Registry.registry_value_data = 0x00000000 by Registry.dest Registry.user Registry.registry_path Registry.registry_value_name Registry.registry_value_data 
| `drop_dm_object_name(Registry)` 
| `security_content_ctime(lastTime)` 
| `security_content_ctime(firstTime)` 
| `disable_defender_mpengine_registry_filter`

Associated Analytic Story

• IceID

How To Implement

To successfully implement this search, you need to be ingesting logs with the registry value name, registry path, and registry value data from your endpoints. If you are using Sysmon, you must have at least version 6.0.4 of the Sysmon TA.

Required field

• _time
• Registry.dest
• Registry.user
• Registry.registry_value_name
• Registry.registry_key_name
• Registry.registry_path
• Registry.registry_value_data

Kill Chain Phase

• Exploitation

Known False Positives

admin or user may choose to disable windows defender product

RBA

Risk Score	Impact	Confidence	Message
49.0	70	70	modified/added/deleted registry entry registry_path in dest

Reference

• https://thedfirreport.com/2021/10/18/icedid-to-xinglocker-ransomware-in-24-hours/

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

• https://media.githubusercontent.com/media/splunk/attack_data/master/datasets/malware/icedid/disable_av/sysmon.log

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