name: Disable Windows Behavior Monitoring
id: 79439cae-9200-11eb-a4d3-acde48001122
version: 1
date: '2021-03-31'
author: Teoderick Contreras, Splunk
type: TTP
datamodel:
- Endpoint
description: This search is to identifies a modification in registry to disable the
  windows denfender real time behavior monitoring. This event or technique is commonly
  seen in RAT, bot, or Trojan to disable AV to evade detections.
search: '| tstats `security_content_summariesonly` count min(_time) as firstTime max(_time)
  as lastTime from datamodel=Endpoint.Registry where Registry.registry_path= "*\\SOFTWARE\\Policies\\Microsoft\\Windows
  Defender\\Real-Time Protection\\DisableBehaviorMonitoring" OR Registry.registry_path=
  "*\\SOFTWARE\\Policies\\Microsoft\\Windows Defender\\Real-Time Protection\\DisableOnAccessProtection"
  OR Registry.registry_path= "*\\SOFTWARE\\Policies\\Microsoft\\Windows Defender\\Real-Time
  Protection\\DisableScanOnRealtimeEnable" OR Registry.registry_path= "*\\SOFTWARE\\Microsoft\\Windows
  Defender\\Real-Time Protection\\DisableRealtimeMonitoring" OR Registry.registry_path=
  "*\\Real-Time Protection\\DisableIntrusionPreventionSystem" OR Registry.registry_path=
  "*\\Real-Time Protection\\DisableIOAVProtection" OR Registry.registry_path= "*\\Real-Time
  Protection\\DisableScriptScanning" Registry.registry_value_data = "0x00000001" by
  Registry.registry_path Registry.registry_key_name Registry.registry_value_data Registry.dest
  | `drop_dm_object_name(Registry)` | `security_content_ctime(firstTime)` |`security_content_ctime(lastTime)`
  | `disable_windows_behavior_monitoring_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 `Registry` node. Also make sure
  that this registry was included in your config files ex. sysmon config to be monitored.
known_false_positives: admin or user may choose to disable this windows features.
references:
- https://tccontre.blogspot.com/2020/01/remcos-rat-evading-windows-defender-av.html
tags:
  analytic_story:
  - Windows Defense Evasion Tactics
  - Ransomware
  - Revil Ransomware
  automated_detection_testing: passed
  confidence: 100
  context:
  - Source: Endpoint
  - Stage: Defense Evasion
  dataset:
  - https://media.githubusercontent.com/media/splunk/attack_data/master/datasets/attack_techniques/T1562.001/win_app_defender_disabling/windows-security.log
  - https://media.githubusercontent.com/media/splunk/attack_data/master/datasets/attack_techniques/T1562.001/win_app_defender_disabling/windows-system.log
  - https://media.githubusercontent.com/media/splunk/attack_data/master/datasets/attack_techniques/T1562.001/win_app_defender_disabling/windows-sysmon.log
  impact: 40
  kill_chain_phases:
  - Exploitation
  message: Windows Defender real time behavior monitoring disabled on $dest
  mitre_attack_id:
  - T1562.001
  - T1562
  observable:
  - name: dest
    type: Endpoint
    role:
    - Victim
  product:
  - Splunk Enterprise
  - Splunk Enterprise Security
  - Splunk Cloud
  required_fields:
  - _time
  - Registry.registry_key_name
  - Registry.registry_path
  - Registry.user
  - Registry.dest
  - Registry.registry_value_name
  risk_score: 40
  security_domain: endpoint