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Suspicious Renaming of ESXI index.html File

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Suspicious Renaming of ESXI index.html File

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Identifies instances where the "index.html" file within the "/usr/lib/vmware/*" directory is renamed on a Linux system. The rule monitors for the "rename" event action associated with this specific file and path, which could indicate malicious activity.

Rule type: eql

Rule indices:

logs-endpoint.events.*

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.bleepingcomputer.com/news/security/massive-esxiargs-ransomware-attack-targets-vmware-esxi-servers-worldwide/

Tags:

Domain: Endpoint
OS: Linux
Use Case: Threat Detection
Tactic: Defense Evasion

Version: 2

Rule authors:

Elastic

Rule license: Elastic License v2

Rule query

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file where host.os.type == "linux" and event.action == "rename" and file.name : "index.html" and
file.Ext.original.path : "/usr/lib/vmware/*"

Framework: MITRE ATT&CK^TM

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/
Sub-technique:
- Name: Rename System Utilities
- ID: T1036.003
- Reference URL: https://attack.mitre.org/techniques/T1036/003/

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