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P4T12ICK
74 lines
2.6 KiB
YAML
74 lines
2.6 KiB
YAML
name: Linux Doas Conf File Creation
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id: f6343e86-6e09-11ec-9376-acde48001122
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version: 1
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date: '2022-01-05'
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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 is to detect the creation of doas.conf file in linux host
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platform. This configuration file can be use by doas utility tool to allow or permit
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standard users to perform tasks as root, the same way sudo does. This tool is developed
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as a minimalistic alternative to sudo application. This tool can be abused advesaries,
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attacker or malware to gain elevated privileges to the targeted or compromised host.
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On the other hand this can also be executed by administrator for a certain task
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that needs admin rights. In this case filter is needed.
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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.Filesystem where Filesystem.file_path IN ("*/etc/doas.conf")
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by Filesystem.dest Filesystem.file_create_time Filesystem.file_name Filesystem.process_guid
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Filesystem.file_path | `drop_dm_object_name(Filesystem)` | `security_content_ctime(lastTime)`
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| `security_content_ctime(firstTime)` | `linux_doas_conf_file_creation_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://wiki.gentoo.org/wiki/Doas
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- https://www.makeuseof.com/how-to-install-and-use-doas/
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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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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/T1548.003/doas/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 file $file_name$ is created in $file_path$ on $dest$
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mitre_attack_id:
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- T1548.003
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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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- Filesystem.dest
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- Filesystem.file_create_time
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- Filesystem.file_name
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- Filesystem.process_guid
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- Filesystem.file_path
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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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