W32/NanoBot.OSW!tr.bdr is classified as a backdoor trojan.
A backdoor trojan is a type of malware that enables a remote user to have unauthorized access to the infected computer. Common backdoor capabilities include capturing keyboard input, collecting system information, downloading/uploading files, performing denial-of-service (DoS) attacks, and running/terminating processes.
The Fortinet Antivirus Analyst Team is constantly updating our descriptions. Please check the FortiGuard Encyclopedia regularly for updates.
- Make sure that your FortiGate/FortiClient system is using the latest AV database.
- Quarantine/delete files that are detected and replace infected files with clean backup copies.