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71 lines
2.9 KiB
YAML
71 lines
2.9 KiB
YAML
name: Linux Auditd Doas Tool Execution
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id: 91b8ca78-f205-4826-a3ef-cd8d6b24e97b
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version: 1
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date: '2024-09-04'
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author: Teoderick Contreras, Splunk
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status: production
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type: Anomaly
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description: The following analytic detects the execution of the 'doas' tool on a
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Linux host. This tool allows standard users to perform tasks with root privileges,
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similar to 'sudo'. The detection leverages data from Linux Auditd, focusing on process names and command-line executions. This activity
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is significant as 'doas' can be exploited by adversaries to gain elevated privileges
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on a compromised host. If confirmed malicious, this could lead to unauthorized administrative
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access, potentially compromising the entire system.
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data_source:
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- Linux Auditd Syscall
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search: '`linux_auditd` type=SYSCALL comm=doas | rename host as dest | stats count
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min(_time) as firstTime max(_time) as lastTime by comm exe SYSCALL UID ppid pid
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success dest | `security_content_ctime(firstTime)` | `security_content_ctime(lastTime)`|
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`linux_auditd_doas_tool_execution_filter`'
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how_to_implement: To implement this detection, the process begins by ingesting auditd
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data, that consist SYSCALL, TYPE, EXECVE and PROCTITLE events, which captures command-line
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executions and process details on Unix/Linux systems. These logs should be ingested
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and processed using Splunk Add-on for Unix and Linux (https://splunkbase.splunk.com/app/833),
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which is essential for correctly parsing and categorizing the data. The next step
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involves normalizing the field names to match the field names set by the Splunk
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Common Information Model (CIM) to ensure consistency across different data sources
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and enhance the efficiency of data modeling. This approach enables effective monitoring
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and detection of linux endpoints where auditd is deployed
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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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- Compromised Linux Host
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asset_type: Endpoint
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confidence: 70
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impact: 70
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message: A SYSCALL - [$comm$] event was executed on host - [$dest$] to execute the "doas" tool.
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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: Endpoint
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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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- comm
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- exe
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- SYSCALL
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- UID
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- ppid
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- pid
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risk_score: 49
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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/T1548.003/linux_auditd_doas/linux_auditd_doas.log
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source: /var/log/audit/audit.log
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sourcetype: linux:audit
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