Hello,
Could you please let us know the File name and path of the File, SEP is detecting??
Trojan.Gen is a generic detection for many individual but varied Trojans for which specific definitions have not been created. A generic detection is used because it protects against many Trojans that share similar characteristics.
There is nothing to worry and you need not require any steps to be performed when a file is Quarantined.
Quarantine is a special location that is reserved for infected files and related system side effects. For security risks, the client quarantines the infected files and removes or repairs their side effects. The client logs the detection if it cannot repair the file.
NOTE: In the Quarantine, the virus cannot spread. When the client moves a file to the Quarantine, you do not have access to the file.
When Symantec Endpoint Protection repairs a virus-infected file, you do not need to take further action to protect your computer. If the client quarantines a security risk-infected file, and then removes and repairs it, you do not need to take additional action.
However, if you could let us know the answers to the above Questions to understand the Threat and its path of detection.