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https://github.com/splunk/security_content
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Eric
76 lines
3.8 KiB
YAML
76 lines
3.8 KiB
YAML
name: Disabling Task Manager
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id: dac279bc-9202-11eb-b7fb-acde48001122
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version: 12
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date: '2025-05-02'
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author: Teoderick Contreras, Splunk, Steven Dick
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status: production
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type: TTP
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description: The following analytic identifies modifications to the Windows registry
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that disable Task Manager. It leverages data from the Endpoint.Registry data model,
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specifically looking for changes to the registry path "*\\SOFTWARE\\Microsoft\\Windows\\CurrentVersion\\Policies\\System\\DisableTaskMgr"
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with a value of "0x00000001". This activity is significant as it is commonly associated
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with malware such as RATs, Trojans, and worms, which disable Task Manager to prevent
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users from terminating malicious processes. If confirmed malicious, this could allow
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attackers to maintain persistence and control over the infected system.
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data_source:
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- Sysmon EventID 13
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search: '| tstats `security_content_summariesonly` count min(_time) as firstTime max(_time)
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as lastTime FROM datamodel=Endpoint.Registry WHERE (Registry.registry_path= "*\\SOFTWARE\\Microsoft\\Windows\\CurrentVersion\\Policies\\System\\DisableTaskMgr"
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Registry.registry_value_data = "0x00000001") by Registry.action Registry.dest Registry.process_guid
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Registry.process_id Registry.registry_hive Registry.registry_path Registry.registry_key_name
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Registry.registry_value_data Registry.registry_value_name Registry.registry_value_type
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Registry.status Registry.user Registry.vendor_product | `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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| `disabling_task_manager_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 official
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Sysmon TA. https://splunkbase.splunk.com/app/5709
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known_false_positives: admin may disable this application for non technical user.
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references:
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- https://any.run/report/ea4ea08407d4ee72e009103a3b77e5a09412b722fdef67315ea63f22011152af/a866d7b1-c236-4f26-a391-5ae32213dfc4#registry
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- https://blog.talosintelligence.com/2020/05/threat-roundup-0424-0501.html
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drilldown_searches:
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- name: View the detection results for - "$user$" and "$dest$"
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search: '%original_detection_search% | search user = "$user$" dest = "$dest$"'
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earliest_offset: $info_min_time$
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latest_offset: $info_max_time$
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- name: View risk events for the last 7 days for - "$user$" and "$dest$"
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search: '| from datamodel Risk.All_Risk | search normalized_risk_object IN ("$user$",
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"$dest$") starthoursago=168 | stats count min(_time) as firstTime max(_time)
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as lastTime values(search_name) as "Search Name" values(risk_message) as "Risk
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Message" values(analyticstories) as "Analytic Stories" values(annotations._all)
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as "Annotations" values(annotations.mitre_attack.mitre_tactic) as "ATT&CK Tactics"
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by normalized_risk_object | `security_content_ctime(firstTime)` | `security_content_ctime(lastTime)`'
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earliest_offset: $info_min_time$
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latest_offset: $info_max_time$
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rba:
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message: The Windows Task Manager was disabled on $dest$ by $user$.
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risk_objects:
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- field: user
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type: user
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score: 42
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- field: dest
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type: system
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score: 42
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threat_objects: []
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tags:
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analytic_story:
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- Windows Defense Evasion Tactics
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- Windows Registry Abuse
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- NjRAT
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asset_type: Endpoint
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mitre_attack_id:
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- T1562.001
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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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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: 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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