Detection rules › Sigma
Potential DLL Sideloading Of DbgModel.DLL
Detects potential DLL sideloading of "DbgModel.dll"
Known false positives
- Legitimate applications loading their own versions of the DLL mentioned in this rule
MITRE ATT&CK coverage
| Tactic | Techniques |
|---|---|
| Execution | |
| Stealth |
Telemetry coverage
| Provider | Record / event type |
|---|---|
| Sysmon | Event ID 7: Image loaded |
Rule body
title: Potential DLL Sideloading Of DbgModel.DLL
id: fef394cd-f44d-4040-9b18-95d92fe278c0
status: test
description: Detects potential DLL sideloading of "DbgModel.dll"
references:
- https://hijacklibs.net/entries/microsoft/built-in/dbgmodel.html
author: Gary Lobermier
date: 2024-07-11
modified: 2024-07-22
tags:
- attack.privilege-escalation
- attack.persistence
- attack.execution
- attack.stealth
- attack.t1574.001
logsource:
product: windows
category: image_load
detection:
selection:
ImageLoaded|endswith: '\dbgmodel.dll'
filter_main_generic:
ImageLoaded|startswith:
- 'C:\Windows\System32\'
- 'C:\Windows\SysWOW64\'
- 'C:\Windows\WinSxS\'
filter_optional_windbg:
ImageLoaded|startswith: 'C:\Program Files\WindowsApps\Microsoft.WinDbg_'
filter_optional_windows_kits:
ImageLoaded|startswith:
- 'C:\Program Files (x86)\Windows Kits\'
- 'C:\Program Files\Windows Kits\'
condition: selection and not 1 of filter_main_* and not 1 of filter_optional_*
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_* and not 1 of filter_optional_*Stage 1: selection
selection:
ImageLoaded|endswith: '\dbgmodel.dll'
Stage 2: not filter_main_generic
filter_main_generic:
ImageLoaded|startswith:
- 'C:\Windows\System32\'
- 'C:\Windows\SysWOW64\'
- 'C:\Windows\WinSxS\'
Stage 3: not filter_optional_*
filter_optional_windbg:
ImageLoaded|startswith: 'C:\Program Files\WindowsApps\Microsoft.WinDbg_'
filter_optional_windows_kits:
ImageLoaded|startswith:
- 'C:\Program Files (x86)\Windows Kits\'
- 'C:\Program Files\Windows Kits\'
Exclusions
The rule actively suppresses these predicates.
| Field | Kind | Excluded values | Search |
|---|---|---|---|
ImageLoaded | starts_with | C:\Windows\SysWOW64\ | excludes:ImageLoaded field:"ImageLoaded" value:"C:\Windows\SysWOW64\" |
ImageLoaded | starts_with | C:\Windows\System32\ | excludes:ImageLoaded field:"ImageLoaded" value:"C:\Windows\System32\" |
ImageLoaded | starts_with | C:\Windows\WinSxS\ | excludes:ImageLoaded field:"ImageLoaded" value:"C:\Windows\WinSxS\" |
ImageLoaded | starts_with | C:\Program Files (x86)\Windows Kits\ | excludes:ImageLoaded field:"ImageLoaded" value:"C:\Program Files (x86)\Windows Kits\" |
ImageLoaded | starts_with | C:\Program Files\Windows Kits\ | excludes:ImageLoaded field:"ImageLoaded" value:"C:\Program Files\Windows Kits\" |
ImageLoaded | starts_with | C:\Program Files\WindowsApps\Microsoft.WinDbg_ | excludes:ImageLoaded field:"ImageLoaded" value:"C:\Program Files\WindowsApps\Microsoft.WinDbg_" |
Indicators
These rows show field, operator, and value matches.
| Field | Kind | Values | Search |
|---|---|---|---|
ImageLoaded | ends_with |
| field:"ImageLoaded" kind:ends_with value:"\dbgmodel.dll" |