name: Disable Windows Behavior Monitoring
id: 79439cae-9200-11eb-a4d3-acde48001122
version: 2
date: '2022-01-27'
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 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"
  AND Registry.registry_value_data = "0x00000001" 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 | `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
  - Windows Registry Abuse
  - Azorult
  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
  asset_type: Endpoint