mirror of
https://github.com/splunk/security_content
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Michael Haag
80 lines
3.0 KiB
YAML
80 lines
3.0 KiB
YAML
name: Linux Setuid Using Chmod Utility
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id: bf0304b6-6250-11ec-9d7c-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 suspicious chmod utility execution to enable
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SUID bit. This allows a user to temporarily gain root access, usually in order to
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run a program. For example, only the root account is allowed to change the password
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information contained in the password database; If the SUID bit appears as an s,
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the file's owner also has execute permission to the file; if it appears as an S,
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the file's owner does not have execute permission. The second specialty permission
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is the SGID, or set group id bit. It is similar to the SUID bit, except it can temporarily
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change group membership, usually to execute a program. The SGID bit is set if an
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s or an S appears in the group section of permissions.
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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 = chmod
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OR Processes.process = "*chmod *") AND Processes.process IN("* g+s *", "* u+s *",
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"* 4777 *", "* 4577 *") by Processes.dest Processes.user Processes.parent_process_name
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Processes.process_name Processes.process Processes.process_id Processes.parent_process_id
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Processes.process_guid | `drop_dm_object_name(Processes)` | `security_content_ctime(firstTime)`
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| `security_content_ctime(lastTime)` | `linux_setuid_using_chmod_utility_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://www.hackingarticles.in/linux-privilege-escalation-using-capabilities/
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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: 70
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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: 70
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kill_chain_phases:
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- Exploitation
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message: a commandline $process$ that may set suid or sgid on $dest$
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mitre_attack_id:
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- T1548.001
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- T1548
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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: 49
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security_domain: endpoint
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asset_type: Endpoint
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