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Bhavin Patel
71 lines
2.2 KiB
YAML
71 lines
2.2 KiB
YAML
name: Linux SSH Authorized Keys Modification
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id: f5ab595e-28e5-4327-8077-5008ba97c850
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version: 1
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date: '2022-07-27'
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author: Michael Haag, Splunk
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status: production
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type: Anomaly
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description: The following analytic identifies based on process execution the modification
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of SSH Authorized Keys. Adversaries perform this behavior to persist on endpoints.
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During triage, review parallel processes and capture any additional file modifications
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for review.
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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: '*/authorized_keys*'
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Image|endswith:
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- bash
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- cat
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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 `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: Filtering will be required as system administrators will add
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and remove. One way to filter query is to add "echo".
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references:
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- https://redcanary.com/blog/lateral-movement-with-secure-shell/
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- https://github.com/redcanaryco/atomic-red-team/blob/master/atomics/T1098.004/T1098.004.md
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tags:
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analytic_story:
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- Linux Living Off The Land
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asset_type: Endpoint
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confidence: 50
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impact: 30
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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 $user$ modifying SSH Authorized Keys.
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mitre_attack_id:
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- T1098.004
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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: 15
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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/T1098.004/ssh_authorized_keys/authkey_linux-sysmon.log
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source: Syslog:Linux-Sysmon/Operational
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sourcetype: sysmon:linux
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update_timestamp: true
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