Network Activity Detected via Kworker
editNetwork Activity Detected via Kworker
editThis rule monitors for network connections from a kworker process. kworker, or kernel worker, processes are part of the kernel’s workqueue mechanism. They are responsible for executing work that has been scheduled to be done in kernel space, which might include tasks like handling interrupts, background activities, and other kernel-related tasks. Attackers may attempt to evade detection by masquerading as a kernel worker process.
Rule type: new_terms
Rule indices:
- logs-endpoint.events.*
Severity: low
Risk score: 21
Runs every: 5m
Searches indices from: now-60m (Date Math format, see also Additional look-back time)
Maximum alerts per execution: 100
References: None
Tags:
- Domain: Endpoint
- OS: Linux
- Use Case: Threat Detection
- Tactic: Command and Control
- Data Source: Elastic Defend
Version: 2
Rule authors:
- Elastic
Rule license: Elastic License v2
Rule query
edithost.os.type:linux and event.category:network and event.action:(connection_attempted or connection_accepted) and process.name:kworker* and not destination.ip:( 10.0.0.0/8 or 127.0.0.0/8 or 169.254.0.0/16 or 172.16.0.0/12 or 192.168.0.0/16 or 224.0.0.0/4 or "::1" or "FE80::/10" or "FF00::/8" )
Framework: MITRE ATT&CKTM
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Tactic:
- Name: Command and Control
- ID: TA0011
- Reference URL: https://attack.mitre.org/tactics/TA0011/
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Tactic:
- Name: Defense Evasion
- ID: TA0005
- Reference URL: https://attack.mitre.org/tactics/TA0005/
-
Technique:
- Name: Masquerading
- ID: T1036
- Reference URL: https://attack.mitre.org/techniques/T1036/
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Technique:
- Name: Rootkit
- ID: T1014
- Reference URL: https://attack.mitre.org/techniques/T1014/
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Tactic:
- Name: Exfiltration
- ID: TA0010
- Reference URL: https://attack.mitre.org/tactics/TA0010/
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Technique:
- Name: Exfiltration Over C2 Channel
- ID: T1041
- Reference URL: https://attack.mitre.org/techniques/T1041/