mirror of
https://github.com/splunk/security_content
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Michael Haag
77 lines
2.8 KiB
YAML
77 lines
2.8 KiB
YAML
name: Linux Change File Owner To Root
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id: c1400ea2-6257-11ec-ad49-acde48001122
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version: 1
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date: '2021-12-21'
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author: Teoderick Contreras, Splunk
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type: Anomaly
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datamodel:
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- Endpoint
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description: This analytic looks for a commandline that change the file owner to root
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using chown utility tool. This technique is commonly abuse by adversaries, malware
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author and red teamers to escalate privilege to the targeted or compromised host
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by changing the owner of their malicious file to root. This event is not so common
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in corporate network except from the administrator doing normal task that needs
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high privilege.
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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 = chown
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OR Processes.process = "*chown *") AND Processes.process = "* root *" 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)` | `security_content_ctime(lastTime)` | `linux_change_file_owner_to_root_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. If you are using Sysmon, you can use the Add-on for Linux Sysmon from
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Splunkbase.
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known_false_positives: Administrator or network operator can execute this command.
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Please update the filter macros to remove false positives.
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references:
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- https://unix.stackexchange.com/questions/101073/how-to-change-permissions-from-root-user-to-all-users
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- https://askubuntu.com/questions/617850/changing-from-user-to-superuser
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tags:
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analytic_story:
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- Linux Privilege Escalation
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- Linux Persistence Techniques
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- Linux Living Off The Land
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automated_detection_testing: passed
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cis20:
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- CIS 3
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- CIS 5
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- CIS 16
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confidence: 80
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context:
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- Source:Endpoint
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- Stage:Privilege Escalation
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- Stage:Persistence
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dataset:
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- https://media.githubusercontent.com/media/splunk/attack_data/master/datasets/attack_techniques/T1548.001/chmod_uid/sysmon_linux.log
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impact: 80
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kill_chain_phases:
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- Exploitation
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message: A commandline $process$ that may change ownership to root on $dest$
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mitre_attack_id:
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- T1222.002
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- T1222
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nist:
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- DE.CM
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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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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: 64
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security_domain: endpoint
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asset_type: Endpoint
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