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P4T12ICK
65 lines
2.2 KiB
YAML
65 lines
2.2 KiB
YAML
name: Linux Possible Access To Credential Files
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id: 16107e0e-71fc-11ec-b862-acde48001122
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version: 1
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date: '2022-01-10'
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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: This analytic is to detect a possible attempt to dump or access the content
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of /etc/passwd and /etc/shadow to enable offline credential cracking. "etc/passwd"
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store user information within linux OS while "etc/shadow" contain the user passwords
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hash. Adversaries and threat actors may attempt to access this to gain persistence
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and/or privilege escalation. This anomaly detection can be a good indicator of possible
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credential dumping technique but it might catch some normal administrator automation
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scripts or during credential auditing. In this scenario filter is needed.
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data_source:
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- Sysmon Event ID 1
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search:
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selection1:
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CommandLine:
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- '*/etc/shadow*'
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- '*/etc/passwd*'
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Image|endswith:
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- cat
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- nano*
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- vim*
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- vi*
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condition: selection1
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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://askubuntu.com/questions/445361/what-is-difference-between-etc-shadow-and-etc-passwd
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- https://attack.mitre.org/techniques/T1003/008/
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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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asset_type: Endpoint
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confidence: 50
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impact: 50
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message: A commandline $process$ executed on $dest$
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mitre_attack_id:
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- T1003.008
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- T1003
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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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risk_score: 25
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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/T1003.008/copy_file_stdoutpipe/sysmon_linux.log
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source: Syslog:Linux-Sysmon/Operational
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sourcetype: sysmon_linux
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