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Active Rule
Potential Notepad++ CVE-2025-49144 Exploitation
Target Profile
Splunk
Splunk SPL & tstats data model queries
Format Mode
Default
Plain SPL queries
Conversion Output
Potential Notepad++ CVE-2025-49144 Exploitation
Using Splunk · Default · sigma-cli 2.0.2
Translation controls
Adjust the rule on the left, then regenerate when you want a fresh backend-native query.
BackendSplunkFormatDefaultVersion2.0.2
title: Potential Notepad++ CVE-2025-49144 Exploitation
id: 933f0bb5-0681-4fe7-8a17-4e6cccbaac44
status: experimental
description: |
Detects potential exploitation of CVE-2025-49144, a local privilege escalation vulnerability in Notepad++ installers (v8.8.1 and prior) where the installer calls regsvr32.exe without specifying the full path.
This allows an attacker to execute arbitrary code with elevated privileges by placing a malicious regsvr32.exe alongside this Legitimate Notepad++ installer.
The vulnerability is triggered when the installer attempts to register the NppShell.dll file, which is a component of Notepad++.
references:
- https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2025-49144
- https://x.com/NullSecurityX/status/1937444064867029179
author: Swachchhanda Shrawan Poudel (Nextron Systems)
date: 2025-06-26
tags:
- attack.persistence
- attack.privilege-escalation
- attack.defense-evasion
- attack.t1574.008
- cve.2025-49144
- detection.emerging-threats
logsource:
product: windows
category: process_creation
detection:
selection:
Image|endswith: '\regsvr32.exe'
CommandLine|startswith: 'regsvr32 /s'
CommandLine|contains: '\contextMenu\NppShell.dll'
filter_main_legit_regsvr32:
Image:
- 'C:\Windows\System32\regsvr32.exe'
- 'C:\Windows\SysWOW64\regsvr32.exe'
condition: selection and not 1 of filter_main_*
falsepositives:
- Unknown
level: high
CLI command
Copy the exact command to reproduce this translation locally.
sigma convert --without-pipeline -t splunk -f default rules-emerging-threats/2025/Exploits/CVE-2025-49144/proc_creation_win_exploit_cve_2025_49144.yml