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P4T12ICK
60 lines
2.4 KiB
YAML
60 lines
2.4 KiB
YAML
name: Windows Remote Services Allow Remote Assistance
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id: 9bce3a97-bc97-4e89-a1aa-ead151c82fbb
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version: 1
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date: '2022-06-21'
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author: Teoderick Contreras, Splunk
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status: production
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type: Anomaly
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description: The following analytic is to identify a modification in the Windows registry
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to enable remote desktop assistance on a targeted machine. This technique was seen
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in several adversaries, malware or red teamer like azorult to remotely access the
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compromised or targeted host by enabling this protocol in registry. Even this protocol
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might be allowed in some production environment, This Anomaly behavior is a good
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pivot to check who and why the user want to enable this feature through registry
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which is un-common. And as per stated in microsoft documentation the default value
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of this registry is false that makes this a good indicator of suspicious behavior.
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data_source:
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- Sysmon Event ID 13
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search:
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selection1:
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Details: '0x00000001'
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TargetObject: '*\\Control\\Terminal Server\\fAllowToGetHelp*'
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condition: selection1
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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. Also make sure
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that this registry was included in your config files ex. sysmon config to be monitored.
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known_false_positives: administrators may enable or disable this feature that may
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cause some false positive.
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references:
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- https://docs.microsoft.com/en-us/windows-hardware/customize/desktop/unattend/microsoft-windows-remoteassistance-exe-fallowtogethelp
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- https://app.any.run/tasks/a6f2ffe2-e6e2-4396-ae2e-04ea0143f2d8/
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tags:
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analytic_story:
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- Azorult
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asset_type: Endpoint
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confidence: 70
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impact: 70
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message: the registry for rdp protocol was modified to enable in $dest$
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mitre_attack_id:
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- T1021.001
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- T1021
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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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risk_score: 49
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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/malware/azorult/sysmon.log
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source: XmlWinEventLog:Microsoft-Windows-Sysmon/Operational
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sourcetype: xmlwineventlog
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update_timestamp: true
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