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https://github.com/splunk/security_content
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Patrick
75 lines
3.0 KiB
YAML
75 lines
3.0 KiB
YAML
name: Disabling CMD Application
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id: ff86077c-9212-11eb-a1e6-acde48001122
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version: 6
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date: '2024-05-16'
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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 detects modifications to the registry that disable
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the CMD prompt application. It leverages data from the Endpoint.Registry data model,
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specifically looking for changes to the "DisableCMD" registry value. This activity
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is significant because disabling CMD can hinder an analyst's ability to investigate
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and remediate threats, a tactic often used by malware such as RATs, Trojans, or
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Worms. If confirmed malicious, this could prevent security teams from using CMD
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for directory and file traversal, complicating incident response and allowing the
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attacker to maintain persistence.
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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\\System\\DisableCMD"
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Registry.registry_value_data = "0x00000001") BY _time span=1h Registry.dest Registry.user
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Registry.registry_path Registry.registry_key_name Registry.registry_value_name Registry.registry_value_data
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Registry.process_guid | `drop_dm_object_name(Registry)` | where isnotnull(registry_value_data)
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| `security_content_ctime(firstTime)` | `security_content_ctime(lastTime)` | `disabling_cmd_application_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 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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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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confidence: 50
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impact: 50
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message: The Windows command prompt was disabled on $dest$ by $user$.
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mitre_attack_id:
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- T1562.001
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- T1562
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- T1112
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observable:
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- name: user
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type: User
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role:
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- Victim
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- name: dest
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type: Hostname
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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: 25
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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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