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sigmamediumHunting

VMGuestLib DLL Sideload

Detects DLL sideloading of VMGuestLib.dll by the WmiApSrv service.

MITRE ATT&CK

T1574.001
defense-evasionpersistenceprivilege-escalation

Detection Query

selection:
  ImageLoaded|contains|all:
    - \VMware\VMware Tools\vmStatsProvider\win32
    - \vmGuestLib.dll
  Image|endswith: \Windows\System32\wbem\WmiApSrv.exe
filter:
  Signed: "true"
condition: selection and not filter

Author

Nasreddine Bencherchali (Nextron Systems)

Created

2022-12-01

Data Sources

windowsImage Load Events

Platforms

windows

References

Tags

attack.defense-evasionattack.persistenceattack.privilege-escalationattack.t1574.001
Raw Content
title: VMGuestLib DLL Sideload
id: 70e8e9b4-6a93-4cb7-8cde-da69502e7aff
status: test
description: Detects DLL sideloading of VMGuestLib.dll by the WmiApSrv service.
references:
    - https://decoded.avast.io/martinchlumecky/png-steganography/
author: Nasreddine Bencherchali (Nextron Systems)
date: 2022-12-01
tags:
    - attack.defense-evasion
    - attack.persistence
    - attack.privilege-escalation
    - attack.t1574.001
logsource:
    category: image_load
    product: windows
detection:
    selection:
        ImageLoaded|contains|all:
            - '\VMware\VMware Tools\vmStatsProvider\win32'
            - '\vmGuestLib.dll'
        Image|endswith: '\Windows\System32\wbem\WmiApSrv.exe'
    filter:
        Signed: 'true'
    condition: selection and not filter
falsepositives:
    - FP could occur if the legitimate version of vmGuestLib already exists on the system
level: medium