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P4T12ICK
73 lines
2.3 KiB
YAML
73 lines
2.3 KiB
YAML
name: Linux OpenVPN Privilege Escalation
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id: d25feebe-fa1c-4754-8a1e-afb03bedc0f2
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version: 1
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date: '2022-08-11'
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author: Gowthamaraj Rajendran, Splunk
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status: production
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type: Anomaly
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description: OpenVPN is a virtual private network system that implements techniques
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to create secure point-to-point or site-to-site connections in routed or bridged
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configurations and remote access facilities. It implements both client and server
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applications. If sudo right is given to the OpenVPN application for the user, then
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the user can run system commands as root and possibly get a root shell.
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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: '*--dev*'
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selection2:
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CommandLine: '*openvpn*'
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selection3:
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CommandLine: '*--script-security*'
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selection4:
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CommandLine: '*--up*'
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selection5:
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CommandLine: '*sudo*'
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condition: selection1 and selection2 and selection3 and selection4 and selection5
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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, filter as needed.
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references:
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- https://gtfobins.github.io/gtfobins/openvpn/
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- https://en.wikipedia.org/wiki/OpenVPN
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tags:
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analytic_story:
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- Linux Privilege Escalation
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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: 60
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message: An instance of $parent_process_name$ spawning $process_name$ was identified
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on endpoint $dest$
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mitre_attack_id:
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- T1548.003
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- T1548
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observable:
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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: 30
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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/T1548/openvpn/sysmon_linux.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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