Detection rules › Sigma
Potential Exploitation of RCE Vulnerability CVE-2025-33053 - Image Load
Detects potential exploitation of remote code execution vulnerability CVE-2025-33053 by monitoring suspicious image loads from WebDAV paths. The exploit involves malicious executables from attacker-controlled WebDAV servers loading the Windows system DLLs like gdi32.dll, netapi32.dll, etc.
MITRE ATT&CK coverage
| Tactic | Techniques |
|---|---|
| Stealth | T1218 System Binary Proxy Execution |
| Command & Control | T1105 Ingress Tool Transfer |
Event coverage
| Provider | Event | Title |
|---|---|---|
| Sysmon | Event ID 7 | Image loaded |
Rule body yaml
title: Potential Exploitation of RCE Vulnerability CVE-2025-33053 - Image Load
id: 04fc4b22-91a6-495a-879d-0144fec5ec03
related:
- id: abe06362-a5b9-4371-8724-ebd00cd48a04
type: similar
- id: 9a2d8b3e-f5a1-4c68-9e21-7d9e1cf8a123
type: similar
status: experimental
description: |
Detects potential exploitation of remote code execution vulnerability CVE-2025-33053
by monitoring suspicious image loads from WebDAV paths. The exploit involves malicious executables from
attacker-controlled WebDAV servers loading the Windows system DLLs like gdi32.dll, netapi32.dll, etc.
references:
- https://msrc.microsoft.com/update-guide/en-US/vulnerability/CVE-2025-33053
- https://research.checkpoint.com/2025/stealth-falcon-zero-day/
author: Swachchhanda Shrawan Poudel (Nextron Systems)
date: 2025-06-13
tags:
- attack.command-and-control
- attack.execution
- attack.stealth
- attack.t1218
- attack.lateral-movement
- attack.t1105
- detection.emerging-threats
- cve.2025-33053
logsource:
category: image_load
product: windows
detection:
selection_img_path:
Image|startswith: '\\\\'
Image|contains: '\DavWWWRoot\'
selection_img_bin:
Image|endswith:
- '\route.exe'
- '\netsh.exe'
- '\makecab.exe'
- '\dxdiag.exe'
- '\ipconfig.exe'
- '\explorer.exe'
condition: all of selection_*
falsepositives:
- Unknown
level: high
Stages and Predicates
Stage 0: condition
all of selection_*Stage 1: selection_img_path
selection_img_path:
Image|startswith: '\\\\'
Image|contains: '\DavWWWRoot\'
Stage 2: selection_img_bin
selection_img_bin:
Image|endswith:
- '\route.exe'
- '\netsh.exe'
- '\makecab.exe'
- '\dxdiag.exe'
- '\ipconfig.exe'
- '\explorer.exe'
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.