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P4T12ICK
79 lines
2.9 KiB
YAML
79 lines
2.9 KiB
YAML
name: Linux GNU Awk Privilege Escalation
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id: 0dcf43b9-50d8-42a6-acd9-d1c9201fe6ae
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version: 1
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date: '2022-08-09'
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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: gawk command in Linux is used for pattern scanning and processing language.
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The awk command requires no compiling and allows the user to use variables, numeric
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functions, string functions, and logical operators. It is a utility that enables
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programmers to write tiny and effective programs in the form of statements that
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define text patterns that are to be searched for, in a text document and the action
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that is to be taken when a match is found within a line. If sudo right is given
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to gawk tool for the user, then the user can run system commands as root and possibly
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get a root shell.
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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="*gawk*" AND
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Processes.process="*BEGIN*{system*" AND Processes.process="*sudo*" by Processes.dest
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Processes.user Processes.parent_process_name Processes.process_name Processes.process
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Processes.process_id Processes.parent_process_id Processes.process_guid | `drop_dm_object_name(Processes)`
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| `security_content_ctime(firstTime)` | `linux_gnu_awk_privilege_escalation_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, filter as needed.
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references:
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- https://gtfobins.github.io/gtfobins/gawk/
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- https://www.geeksforgeeks.org/gawk-command-in-linux-with-examples/
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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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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.process_name
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- Processes.process
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- Processes.process_id
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- Processes.parent_process_id
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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/gawk/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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