: If the nssm.exe binary or its directory has "Full Control" or "Modify" permissions for the "Everyone" or "Users" group, an attacker can replace the legitimate service binary with a malicious one.
Security Operations Center (SOC) teams should monitor their environments for the following anomalous behaviors:
If the directory containing the target executable (or the NSSM.exe binary itself) has weak Access Control Lists (ACLs), a low-privileged user can modify or replace the binary. nssm224 privilege escalation updated
: Regularly audit system event logs for new service installations, as attackers often use NSSM to establish persistence .
NSSM is used to run applications as Windows services. Privilege escalation occurs if the service is configured to run as LocalSystem but points to an executable or DLL that a low-privileged user can modify. : If the nssm
gwmi win32_service | ? $_.PathName -notlike '"*' -and $_.PathName -like '* *' | select Name, PathName Use code with caution. 4. Use Managed Service Accounts (gMSAs)
The most reliable detection method is to audit the permissions of every nssm.exe instance on your Windows systems. Use the icacls command: NSSM is used to run applications as Windows services
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move "C:\Program Files\Amateur Service\app.exe" "C:\Program Files\Amateur Service\app.exe.bak" move service.exe "C:\Program Files\Amateur Service\app.exe" Use code with caution.
If your environment utilizes NSSM 2.24, immediate action is recommended to secure service binaries: Audit Permissions: Ensure that only Administrators