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P4T12ICK
79 lines
2.5 KiB
YAML
79 lines
2.5 KiB
YAML
name: Windows Protocol Tunneling with Plink
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id: 8aac5e1e-0fab-4437-af0b-c6e60af23eed
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version: 1
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date: '2022-09-15'
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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: The following analytic identifies the use of Plink being utilized to
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proxy egress or laterally in an organization. The analytic is limited to specific
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Plink options on the command-line, including -R -L and -D which will have the remote
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and local IP address or port and -l for a username. Modify the options as seen fit
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for your organization.
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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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CommandLine:
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- '*-R *'
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- '*-L *'
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- '*-D *'
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- '*-l *'
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OriginalFileName: Plink
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selection2:
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Image|endswith: plink.exe
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condition: selection1 or selection2
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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: False positives may be present if the organization allows for
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SSH tunneling outbound or internally. Filter as needed.
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references:
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- https://thedfirreport.com/2022/06/06/will-the-real-msiexec-please-stand-up-exploit-leads-to-data-exfiltration/
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- https://www.chiark.greenend.org.uk/~sgtatham/putty/latest.html
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- https://attack.mitre.org/techniques/T1572/
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- https://documentation.help/PuTTY/using-cmdline-portfwd.html#S3.8.3.5
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tags:
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analytic_story:
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- CISA AA22-257A
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asset_type: Endpoint
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confidence: 80
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impact: 70
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message: An instance of $parent_process_name$ spawning $process_name$ was identified
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on endpoint $dest$ by user $user$ attempting to tunnel to a remote destination.
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mitre_attack_id:
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- T1572
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- T1021.004
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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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- name: parent_process_name
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type: Process
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role:
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- Parent Process
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- name: process_name
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type: Process
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role:
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- Child Process
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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: 56
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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/T1572/plink/plink-windows-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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