Unusual SSHD Child Process

This rule detects the creation of an unusual SSHD child process through the usage of the new_terms rule type. Attackers may abuse SSH to maintain persistence on a compromised system, or to establish a backdoor for remote access, potentially resulting in an unusual SSHD child process being created.

Rule type: new_terms

Rule indices:

logs-endpoint.events.process*

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://hadess.io/the-art-of-linux-persistence/

Tags:

Domain: Endpoint
OS: Linux
Use Case: Threat Detection
Tactic: Persistence
Data Source: Elastic Defend

Version: 1

Rule authors:

Elastic

Rule license: Elastic License v2

Rule query

edit

event.category:process and host.os.type:linux and event.type:start and event.action:exec and
process.parent.name:(ssh or sshd) and process.args_count:2 and
not process.command_line:(-bash or -zsh or -sh)

Framework: MITRE ATT&CK^TM

Tactic:
- Name: Persistence
- ID: TA0003
- Reference URL: https://attack.mitre.org/tactics/TA0003/
Technique:
- Name: Event Triggered Execution
- ID: T1546
- Reference URL: https://attack.mitre.org/techniques/T1546/
Sub-technique:
- Name: Unix Shell Configuration Modification
- ID: T1546.004
- Reference URL: https://attack.mitre.org/techniques/T1546/004/
Tactic:
- Name: Lateral Movement
- ID: TA0008
- Reference URL: https://attack.mitre.org/tactics/TA0008/
Technique:
- Name: Remote Services
- ID: T1021
- Reference URL: https://attack.mitre.org/techniques/T1021/
Sub-technique:
- Name: SSH
- ID: T1021.004
- Reference URL: https://attack.mitre.org/techniques/T1021/004/
Technique:
- Name: Remote Service Session Hijacking
- ID: T1563
- Reference URL: https://attack.mitre.org/techniques/T1563/
Sub-technique:
- Name: SSH Hijacking
- ID: T1563.001
- Reference URL: https://attack.mitre.org/techniques/T1563/001/
Tactic:
- Name: Command and Control
- ID: TA0011
- Reference URL: https://attack.mitre.org/tactics/TA0011/

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