Wmiprvse Wbemcomn DLL Hijack

Status: test
Severity: high
Log source: category image_load, product windows
Author: Roberto Rodriguez (Cyb3rWard0g), OTR (Open Threat Research)
Source: github.com/SigmaHQ/sigma

Detects a threat actor creating a file named wbemcomn.dll in the C:\Windows\System32\wbem\ directory over the network and loading it for a WMI DLL Hijack scenario.

MITRE ATT&CK coverage

Tactic	Techniques
Execution	`T1047` Windows Management Instrumentation
Lateral Movement	`T1021.002` Remote Services: SMB/Windows Admin Shares

Telemetry coverage

Provider	Record / event type
Sysmon	Event ID 7: Image loaded

Rule body

title: Wmiprvse Wbemcomn DLL Hijack
id: 7707a579-e0d8-4886-a853-ce47e4575aaa
status: test
description: Detects a threat actor creating a file named `wbemcomn.dll` in the `C:\Windows\System32\wbem\` directory over the network and loading it for a WMI DLL Hijack scenario.
references:
    - https://threathunterplaybook.com/hunts/windows/201009-RemoteWMIWbemcomnDLLHijack/notebook.html
author: Roberto Rodriguez (Cyb3rWard0g), OTR (Open Threat Research)
date: 2020-10-12
modified: 2022-10-09
tags:
    - attack.execution
    - attack.t1047
    - attack.lateral-movement
    - attack.t1021.002
logsource:
    product: windows
    category: image_load
detection:
    selection:
        Image|endswith: '\wmiprvse.exe'
        ImageLoaded|endswith: '\wbem\wbemcomn.dll'
    condition: selection
falsepositives:
    - Unknown
level: high

Stages and Predicates

Stage 0: `condition`

selection

Stage 1: `selection`

selection:
    Image|endswith: '\wmiprvse.exe'
    ImageLoaded|endswith: '\wbem\wbemcomn.dll'

Indicators

These rows show field, operator, and value matches.

Field	Kind	Values	Search
`Image`	ends_with	`\wmiprvse.exe` corpus 2 (sigma 2)	`field:"Image" kind:ends_with value:"\wmiprvse.exe"`
`ImageLoaded`	ends_with	`\wbem\wbemcomn.dll`	`field:"ImageLoaded" kind:ends_with value:"\wbem\wbemcomn.dll"`