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P4T12ICK
75 lines
2.7 KiB
YAML
75 lines
2.7 KiB
YAML
name: Linux SSH Remote Services Script Execute
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id: aa1748dd-4a5c-457a-9cf6-ca7b4eb711b3
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version: 1
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date: '2023-03-03'
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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 SSH being utilized to move laterally
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and execute a script or file on the remote host.
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data_source:
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- Sysmon Event ID 1
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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=ssh Processes.process IN ("*oStrictHostKeyChecking*", "*oConnectTimeout*", "*oBatchMode*") AND Processes.process IN ("*http:*","*https:*") by Processes.dest Processes.user Processes.parent_process_name Processes.process_name Processes.process Processes.process_id Processes.parent_process_id
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| `drop_dm_object_name(Processes)`
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| `security_content_ctime(firstTime)`
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| `security_content_ctime(lastTime)`
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| `linux_ssh_remote_services_script_execute_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. 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: This is not a common command to be executed. Filter as needed.
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references:
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- https://redcanary.com/blog/lateral-movement-with-secure-shell/
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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: 70
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impact: 80
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message: An instance of $process_name$ was identified on endpoint $dest$ by user
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$user$ attempting to move laterally and download a file.
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mitre_attack_id:
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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: 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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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_name
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- Processes.parent_process
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- Processes.original_file_name
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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_path
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- Processes.process_path
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- Processes.parent_process_id
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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/T1021.004/atomic_red_team/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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