Detection rules › Splunk
Windows Modify Registry Tamper Protection
The following analytic detects a suspicious modification to the Windows Defender Tamper Protection registry setting. It leverages data from the Endpoint datamodel, specifically targeting changes where the registry path is set to disable Tamper Protection. This activity is significant because disabling Tamper Protection can allow adversaries to make further undetected changes to Windows Defender settings, potentially leading to reduced security on the system. If confirmed malicious, this could enable attackers to evade detection, persist in the environment, and execute further malicious activities without interference from Windows Defender.
Known false positives
- Administrators may enable or disable this feature that may cause some false positive.
MITRE ATT&CK coverage
| Tactic | Techniques |
|---|---|
| Persistence | |
| Defense Impairment |
Telemetry coverage
| Provider | Record / event type |
|---|---|
| Sysmon | Event ID 13: RegistryEvent (Value Set) |
Rule body
name: Windows Modify Registry Tamper Protection
id: 12094335-88fc-4c3a-b55f-e62dd8c93c23
version: 12
creation_date: '2023-04-26'
modification_date: '2026-05-13'
author: Teoderick Contreras, Splunk
status: production
type: TTP
description: The following analytic detects a suspicious modification to the Windows Defender Tamper Protection registry setting. It leverages data from the Endpoint datamodel, specifically targeting changes where the registry path is set to disable Tamper Protection. This activity is significant because disabling Tamper Protection can allow adversaries to make further undetected changes to Windows Defender settings, potentially leading to reduced security on the system. If confirmed malicious, this could enable attackers to evade detection, persist in the environment, and execute further malicious activities without interference from Windows Defender.
data_source:
- Sysmon EventID 13
search: '| tstats `security_content_summariesonly` count min(_time) as firstTime max(_time) as lastTime from datamodel=Endpoint.Registry where Registry.registry_path="*\\SOFTWARE\\Microsoft\\Windows Defender\\Features\\TamperProtection" AND Registry.registry_value_data="0x00000000" by Registry.action Registry.dest Registry.process_guid Registry.process_id Registry.registry_hive Registry.registry_path Registry.registry_key_name Registry.registry_value_data Registry.registry_value_name Registry.registry_value_type Registry.status Registry.user Registry.vendor_product | `drop_dm_object_name(Registry)` | `security_content_ctime(lastTime)` | `security_content_ctime(firstTime)` | `windows_modify_registry_tamper_protection_filter`'
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: Administrators may enable or disable this feature that may cause some false positive.
references:
- https://malpedia.caad.fkie.fraunhofer.de/details/win.redline_stealer
finding:
title: A registry modification to tamper Windows Defender protection on $dest$
entity:
field: dest
type: system
score: 50
analytic_story:
- Scattered Lapsus$ Hunters
- RedLine Stealer
asset_type: Endpoint
atomic_guid:
- 12e03af7-79f9-4f95-af48-d3f12f28a260
mitre_attack_id:
- T1112
product:
- Splunk Enterprise
- Splunk Enterprise Security
- Splunk Cloud
category: endpoint
security_domain: endpoint
Stages and Predicates
Stage 1: tstats
| tstats `security_content_summariesonly` count min(_time) as firstTime max(_time) as lastTime from datamodel=Endpoint.Registry where Registry.registry_path="*\\SOFTWARE\\Microsoft\\Windows Defender\\Features\\TamperProtection" AND Registry.registry_value_data="0x00000000" by Registry.action Registry.dest Registry.process_guid Registry.process_id Registry.registry_hive Registry.registry_path Registry.registry_key_name Registry.registry_value_data Registry.registry_value_name Registry.registry_value_type Registry.status Registry.user Registry.vendor_product
Stage 2: search
| `drop_dm_object_name(Registry)`
Stage 3: search
| `security_content_ctime(lastTime)`
Stage 4: search
| `security_content_ctime(firstTime)`
Stage 5: search
| `windows_modify_registry_tamper_protection_filter`
Indicators
These rows show field, operator, and value matches.
| Field | Kind | Values | Search |
|---|---|---|---|
Registry.registry_path | eq |
| field:"registry_path" kind:eq |
Registry.registry_value_data | eq |
| field:"Details" kind:eq |