Detection rules › Sigma
DLL Load By System Process From Suspicious Locations
Detects when a system process (i.e. located in system32, syswow64, etc.) loads a DLL from a suspicious location or a location with permissive permissions such as "C:\Users\Public"
MITRE ATT&CK coverage
| Tactic | Techniques |
|---|---|
| Stealth | T1070 Indicator Removal |
Event coverage
| Provider | Event | Title |
|---|---|---|
| Sysmon | Event ID 7 | Image loaded |
Rule body yaml
title: DLL Load By System Process From Suspicious Locations
id: 9e9a9002-56c4-40fd-9eff-e4b09bfa5f6c
status: test
description: Detects when a system process (i.e. located in system32, syswow64, etc.) loads a DLL from a suspicious location or a location with permissive permissions such as "C:\Users\Public"
references:
- https://github.com/hackerhouse-opensource/iscsicpl_bypassUAC (Idea)
author: Nasreddine Bencherchali (Nextron Systems)
date: 2022-07-17
modified: 2023-09-18
tags:
- attack.stealth
- attack.t1070
logsource:
product: windows
category: image_load
detection:
selection:
Image|startswith: 'C:\Windows\'
ImageLoaded|startswith:
# TODO: Add more suspicious paths as you see fit in your env
- 'C:\Users\Public\'
- 'C:\PerfLogs\'
condition: selection
falsepositives:
- Unknown
level: medium
Stages and Predicates
Stage 0: condition
selectionStage 1: selection
selection:
Image|startswith: 'C:\Windows\'
ImageLoaded|startswith:
- 'C:\Users\Public\'
- 'C:\PerfLogs\'
Indicators
Each row is a field, operator, and value that the rule matches. The corpus column counts how many other rules in the catalog look for the same combination: high numbers point to widely-used, community-vetted indicators. Blank or 1 shows that the indicator is specific to this rule.
| Field | Kind | Values |
|---|---|---|
Image | starts_with |
|
ImageLoaded | starts_with |
|