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P4T12ICK
70 lines
2.7 KiB
YAML
70 lines
2.7 KiB
YAML
name: Windows DisableAntiSpyware Registry
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id: 23150a40-9301-4195-b802-5bb4f43067fb
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version: 2
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date: '2021-03-02'
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author: Rod Soto, Jose Hernandez, Michael Haag, Splunk
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type: TTP
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datamodel:
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- Endpoint
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description: The search looks for the Registry Key DisableAntiSpyware set to disable.
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This is consistent with Ryuk infections across a fleet of endpoints. This particular
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behavior is typically executed when an ransomware actor gains access to an endpoint
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and beings to perform execution. Usually, a batch (.bat) will be executed and multiple
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registry and scheduled task modifications will occur. During triage, review parallel
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processes and identify any further file modifications. Endpoint should be isolated.
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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_key_name="DisableAntiSpyware"
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AND Registry.registry_value_name="DWORD (0x00000001)" by Registry.dest Registry.user
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Registry.registry_path Registry.registry_value_name | `drop_dm_object_name(Registry)`
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| `security_content_ctime(lastTime)` | `security_content_ctime(firstTime)` | `windows_disableantispyware_registry_filter`'
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how_to_implement: To successfully implement this search you need to be ingesting information
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on process that include the name of the process responsible for the changes from
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your endpoints into the `Endpoint` datamodel in the `Registry` node.
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known_false_positives: It is unusual to turn this feature off a Windows system since
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it is a default security control, although it is not rare for some policies to disable
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it. Although no false positives have been identified, use the provided filter macro
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to tune the search.
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references:
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- https://blog.malwarebytes.com/malwarebytes-news/2021/02/lazyscripter-from-empire-to-double-rat/
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tags:
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analytic_story:
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- Ryuk Ransomware
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- Windows Defense Evasion Tactics
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asset_type: Endpoint
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automated_detection_testing: passed
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cis20:
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- CIS 8
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confidence: 80
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context:
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- Source:Endpoint
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- Stage:Defense Evasion
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dataset:
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- https://media.githubusercontent.com/media/splunk/attack_data/master/datasets/attack_techniques/T1562.001/atomic_red_team/windows-sysmon.log
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impact: 30
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kill_chain_phases:
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- Delivery
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message: Windows DisableAntiSpyware registry key set to 'disabled' on $dest$
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mitre_attack_id:
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- T1562.001
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nist:
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- PR.PT
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- DE.CM
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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.registry_key_name
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- Registry.registry_value_name
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- Registry.dest
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- Registry.user
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- Registry.registry_path
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risk_score: 24
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security_domain: endpoint
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