Exploit: Nssm-2.24

The attacker didn't even have to force a reboot. They waited. Three days later, a scheduled Windows Update triggered a system restart. As the server hummed back to life, the Service Control Manager (SCM) reached out to start the "Automation Task." It looked for the path to nssm.exe , which was configured to run under the LocalSystem account.

It started with a single, low-priority alert: "Unexpected Process Termination." To a junior analyst, it looked like a routine crash of a legacy background service. But to Senior Architect Elias, it was a "canary in the coal mine." The service in question was managed by NSSM 2.24 , a popular open-source tool used by the company to keep their custom automation scripts running. nssm-2.24 exploit

Ensure that only SYSTEM and Administrators have write access to the directory where nssm.exe is stored. The attacker didn't even have to force a reboot

Malware often uses NSSM to ensure persistent background operation of coinminers (like XMRig) or reverse shells (like ngrok) because NSSM automatically restarts the process if it is killed or crashes. Exploit-DB Vulnerability References Description CVE-2016-8742 Insecure file permissions in Apache CouchDB allow replacing CVE-2016-20033 Wowza Streaming Engine grants "Everyone" group access to nssm_x64.exe Unquoted service path vulnerability in Odoo 12.0 using CVE-2025-41686 Recent vulnerability involving improper permissions on Mitigation Recommendations As the server hummed back to life, the