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Potential Linux Credential Dumping via Unshadow

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Potential Linux Credential Dumping via Unshadow

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Identifies the execution of the unshadow utility which is part of John the Ripper, a password-cracking tool on the host machine. Malicious actors can use the utility to retrieve the combined contents of the /etc/shadow and /etc/password files. Using the combined file generated from the utility, the malicious threat actors can use them as input for password-cracking utilities or prepare themselves for future operations by gathering credential information of the victim.

Rule type: eql

Rule indices:

logs-endpoint.events.*
endgame-*

Severity: medium

Risk score: 47

Runs every: 5m

Searches indices from: now-9m (Date Math format, see also Additional look-back time)

Maximum alerts per execution: 100

References:

https://www.cyberciti.biz/faq/unix-linux-password-cracking-john-the-ripper/

Tags:

Data Source: Elastic Endgame
Domain: Endpoint
OS: Linux
Use Case: Threat Detection
Tactic: Credential Access

Version: 3

Rule authors:

Elastic

Rule license: Elastic License v2

Rule query

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process where host.os.type == "linux" and process.name == "unshadow" and
  event.type == "start" and event.action in ("exec", "exec_event") and process.args_count >= 2

Framework: MITRE ATT&CK^TM

Tactic:
- Name: Credential Access
- ID: TA0006
- Reference URL: https://attack.mitre.org/tactics/TA0006/
Technique:
- Name: OS Credential Dumping
- ID: T1003
- Reference URL: https://attack.mitre.org/techniques/T1003/
Sub-technique:
- Name: /etc/passwd and /etc/shadow
- ID: T1003.008
- Reference URL: https://attack.mitre.org/techniques/T1003/008/

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