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P4T12ICK
82 lines
2.6 KiB
YAML
82 lines
2.6 KiB
YAML
name: Powershell Disable Security Monitoring
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id: c148a894-dd93-11eb-bf2a-acde48001122
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version: 3
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date: '2022-07-15'
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author: Michael Haag, Splunk
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status: production
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type: TTP
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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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data_source:
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- Sysmon Event ID 1
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search:
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selection1:
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OriginalFileName: pwsh.dll
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selection2:
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Image|endswith:
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- pwsh.exe
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- sqlps.exe
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- sqltoolsps.exe
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- powershell.exe
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- powershell_ise.exe
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selection3:
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OriginalFileName: PowerShell.EXE
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selection4:
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OriginalFileName: powershell_ise.EXE
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selection5:
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CommandLine: '*set-mppreference*'
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selection6:
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CommandLine:
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- '*disablerealtimemonitoring*'
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- '*disableioavprotection*'
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- '*disableintrusionpreventionsystem*'
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- '*disablescriptscanning*'
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- '*disableblockatfirstseen*'
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- '*DisableBehaviorMonitoring*'
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- '*drtm *'
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- '*dioavp *'
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- '*dscrptsc *'
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- '*dbaf *'
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- '*dbm *'
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condition: (selection1 or selection2 or selection3 or selection4) and selection5
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and selection6
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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. In addition,
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confirm the latest CIM App 4.20 or higher is installed and the latest TA for the
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endpoint product.
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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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- https://docs.microsoft.com/en-us/powershell/module/defender/set-mppreference?view=windowsserver2022-ps
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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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asset_type: Endpoint
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confidence: 50
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impact: 50
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message: ''
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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: ComputerName
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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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risk_score: 25.0
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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/pwh_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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