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P4T12ICK
51 lines
2.3 KiB
YAML
51 lines
2.3 KiB
YAML
name: Powershell Disable Security Monitoring
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id: c148a894-dd93-11eb-bf2a-acde48001122
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version: 1
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date: '2021-07-05'
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author: Michael Haag, Splunk
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type: TTP
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datamodel:
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- Endpoint
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description: This search is to identifies a modification in registry to disable the
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windows denfender real time behavior monitoring. This event or technique is commonly
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seen in RAT, bot, or Trojan to disable AV to evade detections.
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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.Processes where Processes.process_name IN ("powershell.exe",
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"pwsh.exe", "sqlps.exe", "sqltoolsps.exe") Processes.process="*set-mppreference*"
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AND Processes.process IN ("*disablerealtimemonitoring*","*disableioavprotection*","*disableintrusionpreventionsystem*","*disablescriptscanning*","*disableblockatfirstseen*")
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by Processes.dest Processes.user Processes.parent_process Processes.process_name
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Processes.process Processes.process_id Processes.parent_process_id | `drop_dm_object_name(Processes)`
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| `security_content_ctime(firstTime)` | `security_content_ctime(lastTime)` | `powershell_disable_security_monitoring_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 `Processes` node.
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known_false_positives: Limited false positives. However, tune based on scripts that
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may perform this action.
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references:
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- https://github.com/redcanaryco/atomic-red-team/blob/master/atomics/T1562.001/T1562.001.md#atomic-test-15---tamper-with-windows-defender-atp-powershell
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tags:
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analytic_story:
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- Ransomware
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- Revil Ransomware
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automated_detection_testing: passed
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dataset:
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- https://media.githubusercontent.com/media/splunk/attack_data/master/datasets/attack_techniques/T1562.001/pwh_defender_disabling/windows-sysmon.log
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kill_chain_phases:
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- Exploitation
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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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required_fields:
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- _time
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- Processes.dest
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- Processes.user
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- Processes.parent_process
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- Processes.process_name
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- Processes.process
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- Processes.process_id
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- Processes.parent_process_id
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security_domain: endpoint
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