name: Powershell Disable Security Monitoring
id: c148a894-dd93-11eb-bf2a-acde48001122
version: 1
date: '2021-07-05'
author: Michael Haag, Splunk
type: batch
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.Processes where Processes.process_name IN ("powershell.exe",
  "pwsh.exe", "sqlps.exe", "sqltoolsps.exe") Processes.process="*set-mppreference*"
  AND Processes.process IN ("*disablerealtimemonitoring*","*disableioavprotection*","*disableintrusionpreventionsystem*","*disablescriptscanning*","*disableblockatfirstseen*")
  by Processes.dest Processes.user Processes.parent_process Processes.process_name
  Processes.process Processes.process_id Processes.parent_process_id | `drop_dm_object_name(Processes)`
  | `security_content_ctime(firstTime)` | `security_content_ctime(lastTime)` | `powershell_disable_security_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 `Processes` node.
known_false_positives: Limited false positives. However, tune based on scripts that
  may perform this action.
references:
- https://github.com/redcanaryco/atomic-red-team/blob/master/atomics/T1562.001/T1562.001.md#atomic-test-15---tamper-with-windows-defender-atp-powershell
tags:
  analytic_story:
  - Ransomware
  - Revil Ransomware
  kill_chain_phases:
  - Exploitation
  mitre_attack_id:
  - T1562.001
  product:
  - Splunk Enterprise
  - Splunk Enterprise Security
  - Splunk Cloud
  required_fields:
  - _time
  - Processes.dest
  - Processes.user
  - Processes.parent_process
  - Processes.process_name
  - Processes.process
  - Processes.process_id
  - Processes.parent_process_id
  security_domain: endpoint
  automated_detection_testing: passed
  dataset:
  - https://media.githubusercontent.com/media/splunk/attack_data/master/datasets/attack_techniques/T1562.001/pwh_defender_disabling/windows-sysmon.log