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Quarantined files are likely to be dangerous. Encrypting files for quarantine can help protect against accidental reinfection or the effects of some other type of malicious code.
Trend Micro recommends that if you choose to quarantine rather than delete suspect files, that you encrypt them before saving to the quarantine directory.
Click HTTP > HTTP Malware Scan > Policies, and then either choose an existing policy from the list, or click Add to create a new one.
Open the Virus Scan Rule tab. At the bottom of the page, click Encrypt quarantined files.
Click FTP > Scan Rules.
Decrypting Quarantined Files
Quarantine Directory