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Potential Exploitation of CVE-2024-37085 - Suspicious ESX Admins Group Activity

Status
test
Severity
high
Log source
product windows, service security
Author
Nasreddine Bencherchali (Nextron Systems)
Source
github.com/SigmaHQ/sigma

Detects any creation or modification to a windows domain group with the name "ESX Admins". This could indicates a potential exploitation attempt of CVE-2024-37085, which allows an attacker to elevate their privileges to full administrative access on an domain-joined ESXi hypervisor. VMware ESXi hypervisors joined to an Active Directory domain consider any member of a domain group named "ESX Admins" to have full administrative access by default.

MITRE ATT&CK coverage

TacticTechniques
ExecutionNo specific technique

Event coverage

ProviderEventTitle
Security-AuditingEvent ID 4727A security-enabled global group was created.
Security-AuditingEvent ID 4728A member was added to a security-enabled global group.
Security-AuditingEvent ID 4731A security-enabled local group was created.
Security-AuditingEvent ID 4737A security-enabled global group was changed.
Security-AuditingEvent ID 4754A security-enabled universal group was created.
Security-AuditingEvent ID 4755A security-enabled universal group was changed.
Security-AuditingEvent ID 4756A member was added to a security-enabled universal group.

Rule body yaml

title: Potential Exploitation of CVE-2024-37085 - Suspicious ESX Admins Group Activity
id: 47a1658b-67a4-48e2-8ab1-c10437fc0148
status: test
description: |
    Detects any creation or modification to a windows domain group with the name "ESX Admins".
    This could indicates a potential exploitation attempt of CVE-2024-37085, which allows an attacker to elevate their privileges to full administrative access on an domain-joined ESXi hypervisor.
    VMware ESXi hypervisors joined to an Active Directory domain consider any member of a domain group named "ESX Admins" to have full administrative access by default.
references:
    - https://www.microsoft.com/en-us/security/blog/2024/07/29/ransomware-operators-exploit-esxi-hypervisor-vulnerability-for-mass-encryption/
author: Nasreddine Bencherchali (Nextron Systems)
date: 2024-07-30
tags:
    - attack.execution
    - cve.2024-37085
    - detection.emerging-threats
logsource:
    product: windows
    service: security
detection:
    selection:
        EventID:
            - 4727
            - 4728
            - 4731
            - 4737
            - 4754
            - 4755
            - 4756
    keyword_group:
        - 'ESX Admins'
    condition: selection and keyword_group
falsepositives:
    - Unknown
level: high

Stages and Predicates

Stage 0: condition

selection and keyword_group

Stage 1: selection

selection:
    EventID:
        - 4727
        - 4728
        - 4731
        - 4737
        - 4754
        - 4755
        - 4756

Stage 2: keyword_group

keyword_group:
    - 'ESX Admins'