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P4T12ICK
86 lines
3.0 KiB
YAML
86 lines
3.0 KiB
YAML
name: Linux Ngrok Reverse Proxy Usage
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id: bc84d574-708c-467d-b78a-4c1e20171f97
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version: 1
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date: '2023-01-12'
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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 the use of Ngrok being utilized on
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the Linux operating system. Unfortunately, there is no original file name for Ngrok,
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so it may be worth an additional hunt to identify any command-line arguments. The
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sign of someone using Ngrok is not malicious, however, more recently it has become
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an adversary tool.
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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=ngrok
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Processes.process IN ("*start*", "*--config*","*http*","*authtoken*", "*http*",
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"*tcp*") by Processes.dest Processes.user Processes.parent_process_name Processes.process_name
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Processes.original_file_name Processes.process Processes.process_id Processes.parent_process_id
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| `drop_dm_object_name(Processes)` | `security_content_ctime(firstTime)` | `security_content_ctime(lastTime)`
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| `linux_ngrok_reverse_proxy_usage_filter`'
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how_to_implement: To successfully implement this search, you need to be ingesting
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logs with the process name, parent process, and command-line executions from your
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endpoints into the Endpoint datamodel. If you are using Sysmon, you can use the
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Add-on for Linux Sysmon from Splunkbase.
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known_false_positives: False positives may be present if Ngrok is an authorized utility.
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Filter as needed.
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references:
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- https://ngrok.com
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- https://www.cisa.gov/uscert/sites/default/files/publications/aa22-320a_joint_csa_iranian_government-sponsored_apt_actors_compromise_federal%20network_deploy_crypto%20miner_credential_harvester.pdf
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tags:
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analytic_story:
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- Reverse Network Proxy
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asset_type: Endpoint
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confidence: 100
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impact: 50
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message: A reverse proxy was identified spawning from $parent_process_name$ - $process_name$
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on endpoint $dest$ by user $user$.
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mitre_attack_id:
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- T1572
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- T1090
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- T1102
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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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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: 50
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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/ngrok/ngrok_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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