W32/Sidex.A@mm is classified as a mass mailer.
A mass mailer is a type of worm that has the capability to spread itself to other systems at a great rate via email. It commonly captures email addresses in the infected system and uses them as a target list.
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.