disable_defender_spynet_reporting.yml

name: Disable Defender Spynet Reporting
id: 898debf4-3021-11ec-ba7c-acde48001122
version: 4
date: '2023-12-27'
author: Steven Dick, Teoderick Contreras, Splunk
status: production
type: TTP
description: This analytic is intended to detect a suspicious modification of registry
  to disable Windows Defender feature. This technique is intended to bypass or evade
  detection from Windows Defender AV product, specifically the spynet reporting for
  Defender telemetry.
data_source:
- Sysmon EventID 12
- Sysmon EventID 13
search: '| tstats `security_content_summariesonly` count FROM datamodel=Endpoint.Registry
  WHERE (Registry.registry_path = "*\\Microsoft\\Windows Defender\\SpyNet*" Registry.registry_value_name
  = SpynetReporting Registry.registry_value_data = 0x00000000) BY _time span=1h Registry.registry_path
  Registry.registry_key_name Registry.registry_value_name Registry.registry_value_data
  Registry.process_guid Registry.user Registry.dest  | `drop_dm_object_name(Registry)`
  | where isnotnull(registry_value_data) | `security_content_ctime(firstTime)` | `security_content_ctime(lastTime)`
  | `disable_defender_spynet_reporting_filter`'
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 2.0 of the offical
  Sysmon TA. https://splunkbase.splunk.com/app/5709
known_false_positives: admin or user may choose to disable windows defender product
references:
- https://thedfirreport.com/2021/10/18/icedid-to-xinglocker-ransomware-in-24-hours/
tags:
  analytic_story:
  - Azorult
  - Windows Registry Abuse
  - Qakbot
  - IcedID
  - CISA AA23-347A
  asset_type: Endpoint
  confidence: 70
  impact: 70
  message: modified/added/deleted registry entry $registry_path$ in $dest$
  mitre_attack_id:
  - T1562.001
  - T1562
  observable:
  - name: dest
    type: Hostname
    role:
    - Victim
  - name: user
    type: User
    role:
    - Victim
  product:
  - Splunk Enterprise
  - Splunk Enterprise Security
  - Splunk Cloud
  required_fields:
  - _time
  - Registry.dest
  - Registry.registry_value_name
  - Registry.registry_key_name
  - Registry.registry_path
  - Registry.registry_value_data
  - Registry.process_guid
  risk_score: 49
  security_domain: endpoint
tests:
- name: True Positive Test
  attack_data:
  - data: https://media.githubusercontent.com/media/splunk/attack_data/master/datasets/malware/icedid/disable_av/sysmon.log
    source: XmlWinEventLog:Microsoft-Windows-Sysmon/Operational
    sourcetype: xmlwineventlog