mirror of
https://github.com/splunk/security_content
synced 2026-06-08 17:32:49 +00:00
Gowthamaraj rajendran
75 lines
3.3 KiB
YAML
75 lines
3.3 KiB
YAML
name: Powershell Disable Security Monitoring
|
|
id: c148a894-dd93-11eb-bf2a-acde48001122
|
|
version: 3
|
|
date: '2022-07-15'
|
|
author: Michael Haag, Splunk
|
|
status: production
|
|
type: TTP
|
|
description: This search identifies a modification in registry to disable the windows
|
|
defender real time behavior monitoring. This event or technique is commonly seen
|
|
in RATs, bots, or Trojans to disable AV to evade detections.
|
|
data_source:
|
|
- Sysmon Event ID 1
|
|
search: '| tstats `security_content_summariesonly` count min(_time) as firstTime max(_time)
|
|
as lastTime from datamodel=Endpoint.Processes where `process_powershell` Processes.process="*set-mppreference*"
|
|
AND Processes.process IN ("*disablerealtimemonitoring*","*disableioavprotection*","*disableintrusionpreventionsystem*","*disablescriptscanning*","*disableblockatfirstseen*","*DisableBehaviorMonitoring*","*drtm
|
|
*","*dioavp *","*dscrptsc *","*dbaf *","*dbm *") by Processes.dest Processes.user
|
|
Processes.parent_process Processes.original_file_name 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: The detection is based on data that originates from Endpoint Detection
|
|
and Response (EDR) agents. These agents are designed to provide security-related
|
|
telemetry from the endpoints where the agent is installed. To implement this search,
|
|
you must ingest logs that contain the process GUID, process name, and parent process.
|
|
Additionally, you must ingest complete command-line executions. These logs must
|
|
be processed using the appropriate Splunk Technology Add-ons that are specific to
|
|
the EDR product. The logs must also be mapped to the `Processes` node of the `Endpoint`
|
|
data model. Use the Splunk Common Information Model (CIM) to normalize the field
|
|
names and speed up the data modeling process.
|
|
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
|
|
- https://docs.microsoft.com/en-us/powershell/module/defender/set-mppreference?view=windowsserver2022-ps
|
|
tags:
|
|
analytic_story:
|
|
- Ransomware
|
|
- Revil Ransomware
|
|
asset_type: Endpoint
|
|
confidence: 50
|
|
impact: 50
|
|
message: Windows Defender Real-time Behavior Monitoring disabled on $dest$
|
|
mitre_attack_id:
|
|
- T1562.001
|
|
- T1562
|
|
observable:
|
|
- name: dest
|
|
type: Hostname
|
|
role:
|
|
- Victim
|
|
product:
|
|
- Splunk Enterprise
|
|
- Splunk Enterprise Security
|
|
- Splunk Cloud
|
|
required_fields:
|
|
- _time
|
|
- Processes.dest
|
|
- Processes.user
|
|
- Processes.parent_process_name
|
|
- Processes.parent_process
|
|
- Processes.original_file_name
|
|
- Processes.process_name
|
|
- Processes.process
|
|
- Processes.process_id
|
|
- Processes.parent_process_path
|
|
- Processes.process_path
|
|
- Processes.parent_process_id
|
|
risk_score: 25.0
|
|
security_domain: endpoint
|
|
tests:
|
|
- name: True Positive Test
|
|
attack_data:
|
|
- data: https://media.githubusercontent.com/media/splunk/attack_data/master/datasets/attack_techniques/T1562.001/pwh_defender_disabling/windows-sysmon.log
|
|
source: XmlWinEventLog:Microsoft-Windows-Sysmon/Operational
|
|
sourcetype: xmlwineventlog
|