Detection rules › Sigma
VMMap Unsigned Dbghelp.DLL Potential Sideloading
Detects potential DLL sideloading of an unsigned dbghelp.dll by the Sysinternals VMMap.
MITRE ATT&CK coverage
| Tactic | Techniques |
|---|---|
| Execution | |
| Stealth |
Telemetry coverage
| Provider | Record / event type |
|---|---|
| Sysmon | Event ID 7: Image loaded |
Rule body
title: VMMap Unsigned Dbghelp.DLL Potential Sideloading
id: 273a8dd8-3742-4302-bcc7-7df5a80fe425
related:
- id: 98ffaed4-aec2-4e04-9b07-31492fe68b3d
type: similar
status: test
description: Detects potential DLL sideloading of an unsigned dbghelp.dll by the Sysinternals VMMap.
references:
- https://techcommunity.microsoft.com/t5/sysinternals-blog/zoomit-v7-1-procdump-2-0-for-linux-process-explorer-v17-05/ba-p/3884766
author: Nasreddine Bencherchali (Nextron Systems)
date: 2023-07-28
modified: 2023-09-05
tags:
- attack.persistence
- attack.privilege-escalation
- attack.execution
- attack.stealth
- attack.t1574.001
logsource:
category: image_load
product: windows
detection:
selection:
ImageLoaded|contains: 'C:\Debuggers\dbghelp.dll'
Image|endswith:
- '\vmmap.exe'
- '\vmmap64.exe'
filter_main_signed:
Signed: 'true'
condition: selection and not 1 of filter_main_*
falsepositives:
- Unknown
level: high
Stages and Predicates
Stage 0: condition
selection and not 1 of filter_main_*Stage 1: selection
selection:
ImageLoaded|contains: 'C:\Debuggers\dbghelp.dll'
Image|endswith:
- '\vmmap.exe'
- '\vmmap64.exe'
Stage 2: not filter_main_signed
filter_main_signed:
Signed: 'true'
Exclusions
The rule actively suppresses these predicates.
| Field | Kind | Excluded values | Search |
|---|---|---|---|
Signed | eq | true | excludes:Signed field:"Signed" value:"true" |
Indicators
These rows show field, operator, and value matches.
| Field | Kind | Values | Search |
|---|---|---|---|
Image | ends_with |
| field:"Image" kind:ends_with |
ImageLoaded | match |
| field:"ImageLoaded" kind:match value:"C:\Debuggers\dbghelp.dll" |