Detection rules › Sigma

Potential DLL Sideloading Of MpSvc.DLL

Status
test
Severity
medium
Log source
category image_load, product windows
Author
Nasreddine Bencherchali (Nextron Systems), Wietze Beukema
Source
github.com/SigmaHQ/sigma

Detects potential DLL sideloading of "MpSvc.dll".

Known false positives

  • Legitimate applications loading their own versions of the DLL mentioned in this rule.

MITRE ATT&CK coverage

Telemetry coverage

ProviderRecord / event type
SysmonEvent ID 7: Image loaded

Rule body

title: Potential DLL Sideloading Of MpSvc.DLL
id: 5ba243e5-8165-4cf7-8c69-e1d3669654c1
status: test
description: Detects potential DLL sideloading of "MpSvc.dll".
references:
    - https://hijacklibs.net/entries/microsoft/built-in/mpsvc.html
author: Nasreddine Bencherchali (Nextron Systems), Wietze Beukema
date: 2024-07-11
tags:
    - attack.privilege-escalation
    - attack.persistence
    - attack.execution
    - attack.stealth
    - attack.t1574.001
logsource:
    product: windows
    category: image_load
detection:
    selection:
        ImageLoaded|endswith: '\MpSvc.dll'
    filter_main_generic:
        ImageLoaded|startswith:
            - 'C:\Program Files\Windows Defender\'
            - 'C:\ProgramData\Microsoft\Windows Defender\Platform\'
            - 'C:\Windows\WinSxS\'
    condition: selection and not 1 of filter_main_*
falsepositives:
    - Legitimate applications loading their own versions of the DLL mentioned in this rule.
level: medium

Stages and Predicates

Stage 0: condition

selection and not 1 of filter_main_*

Stage 1: selection

selection:
    ImageLoaded|endswith: '\MpSvc.dll'

Stage 2: not filter_main_generic

filter_main_generic:
    ImageLoaded|startswith:
        - 'C:\Program Files\Windows Defender\'
        - 'C:\ProgramData\Microsoft\Windows Defender\Platform\'
        - 'C:\Windows\WinSxS\'

Exclusions

The rule actively suppresses these predicates.

FieldKindExcluded valuesSearch
ImageLoadedstarts_withC:\Program Files\Windows Defender\excludes:ImageLoaded field:"ImageLoaded" value:"C:\Program Files\Windows Defender\"
ImageLoadedstarts_withC:\ProgramData\Microsoft\Windows Defender\Platform\excludes:ImageLoaded field:"ImageLoaded" value:"C:\ProgramData\Microsoft\Windows Defender\Platform\"
ImageLoadedstarts_withC:\Windows\WinSxS\excludes:ImageLoaded field:"ImageLoaded" value:"C:\Windows\WinSxS\"

Indicators

These rows show field, operator, and value matches.