Nssm224 Privilege Escalation Updated Best Direct

Avoid running NSSM services under LocalSystem or SYSTEM unless absolutely necessary. Instead, configure the service to run under a Group Managed Service Account (gMSA) or a dedicated local user account with the bare minimum privileges required to perform its specific task. 5. Monitor and Audit Service Changes

copy /y c:\Temp\reverse_shell.exe "C:\Program Files\Vendor Software\nssm.exe"

The attacker moves the original executable aside and drops their malicious binary into the folder, renaming it to match the expected service file: nssm224 privilege escalation updated

Binary folders under C:\Program Files\ or custom paths should only grant Write access to Administrators and SYSTEM .

Q: How does the NSSM224 privilege escalation exploit work? A: The NSSM224 privilege escalation exploit works by exploiting a vulnerability in the NSSM224 service manager, allowing an attacker to execute arbitrary code with elevated privileges. Avoid running NSSM services under LocalSystem or SYSTEM

Set-MpPreference -AttackSurfaceReductionRules_Ids 3B576869-A4EC-41E9-8E09-387D72F48587 -AttackSurfaceReductionRules_Actions Enabled

The directory where the NSSM executable, its configuration, or the target application resides is given overly permissive Access Control Lists (e.g., the Users group or the Everyone group has Modify or Write access). nssm224 privilege escalation updated

: If a low-privileged user has "Write" or "Full Control" over the folder where nssm.exe or the application it wraps is located, they can replace the binary with a malicious one .

The most critical defense is ensuring that only administrators have write access to directories where service binaries and configurations are stored. Low-privileged accounts should only have Read & Execute permissions.

In environments using NSSM 2.24, attackers typically look for the following misconfigurations to escalate to SYSTEM privileges:

Monitor Windows Security Event ID 7045 (A new service was created) and Event ID 7040 (The start type of a service was changed).