MSIL/Agent.DEF!tr.spy is classified as a spy trojan.
A spy trojan is a type of malware that has the capability to gather information from the infected system without consent from the user. This information is then sent to a remote attacker.
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.