mirror of
https://github.com/splunk/security_content
synced 2026-06-08 17:32:49 +00:00
Bhavin Patel
81 lines
3.6 KiB
YAML
81 lines
3.6 KiB
YAML
name: Disable Windows Behavior Monitoring
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id: 79439cae-9200-11eb-a4d3-acde48001122
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version: 6
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date: '2024-05-18'
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author: Steven Dick, Teoderick Contreras, Splunk
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status: production
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type: TTP
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description: The following analytic identifies modifications in the registry to disable
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Windows Defender's real-time behavior monitoring. It leverages data from the Endpoint.Registry
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data model, specifically monitoring changes to registry paths associated with Windows
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Defender settings. This activity is significant because disabling real-time protection
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is a common tactic used by malware such as RATs, bots, or Trojans to evade detection.
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If confirmed malicious, this action could allow an attacker to execute code, escalate
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privileges, or persist in the environment without being detected by antivirus software.
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data_source:
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- Sysmon EventID 12
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- Sysmon EventID 13
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search: '| tstats `security_content_summariesonly` count FROM datamodel=Endpoint.Registry
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WHERE (Registry.registry_path= "*\\SOFTWARE\\Policies\\Microsoft\\Windows Defender\\Real-Time
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Protection\\DisableBehaviorMonitoring" OR Registry.registry_path= "*\\SOFTWARE\\Policies\\Microsoft\\Windows
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Defender\\Real-Time Protection\\DisableOnAccessProtection" OR Registry.registry_path=
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"*\\SOFTWARE\\Policies\\Microsoft\\Windows Defender\\Real-Time Protection\\DisableScanOnRealtimeEnable"
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OR Registry.registry_path= "*\\SOFTWARE\\Microsoft\\Windows Defender\\Real-Time
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Protection\\DisableRealtimeMonitoring" OR Registry.registry_path= "*\\Real-Time
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Protection\\DisableIntrusionPreventionSystem" OR Registry.registry_path= "*\\Real-Time
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Protection\\DisableIOAVProtection" OR Registry.registry_path= "*\\Real-Time Protection\\DisableScriptScanning"
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AND Registry.registry_value_data = "0x00000001") BY _time span=1h Registry.dest
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Registry.user Registry.registry_path Registry.registry_key_name Registry.registry_value_name
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Registry.registry_value_data Registry.process_guid | `drop_dm_object_name(Registry)`
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| where isnotnull(registry_value_data) | `security_content_ctime(firstTime)` | `security_content_ctime(lastTime)`
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| `disable_windows_behavior_monitoring_filter`'
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how_to_implement: To successfully implement this search, you need to be ingesting
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logs with the registry value name, registry path, and registry value data from your
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endpoints. If you are using Sysmon, you must have at least version 2.0 of the offical
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Sysmon TA. https://splunkbase.splunk.com/app/5709
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known_false_positives: admin or user may choose to disable this windows features.
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references:
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- https://tccontre.blogspot.com/2020/01/remcos-rat-evading-windows-defender-av.html
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tags:
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analytic_story:
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- Azorult
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- Ransomware
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- Windows Registry Abuse
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- RedLine Stealer
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- Windows Defense Evasion Tactics
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- CISA AA23-347A
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- Revil Ransomware
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asset_type: Endpoint
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confidence: 100
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impact: 40
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message: Windows Defender real time behavior monitoring disabled on $dest
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mitre_attack_id:
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- T1562.001
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- T1562
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observable:
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- name: dest
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type: Endpoint
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role:
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- Victim
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product:
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- Splunk Enterprise
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- Splunk Enterprise Security
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- Splunk Cloud
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required_fields:
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- _time
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- Registry.dest
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- Registry.registry_value_name
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- Registry.registry_key_name
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- Registry.registry_path
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- Registry.registry_value_data
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- Registry.process_guid
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risk_score: 40
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security_domain: endpoint
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tests:
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- name: True Positive Test
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attack_data:
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- data:
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https://media.githubusercontent.com/media/splunk/attack_data/master/datasets/attack_techniques/T1562.001/win_app_defender_disabling/windows-sysmon.log
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source: XmlWinEventLog:Microsoft-Windows-Sysmon/Operational
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sourcetype: xmlwineventlog
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