Packed.Generic.377 is a heuristic detection for files that may have been obfuscated or encrypted in order to conceal themselves from antivirus software. This heuristic detection is used to detect malware associated with the Trojan.Zeroaccess
family of threats.
Files that are detected as Packed.Generic.377 are considered malicious. We suggest that any files you believe are incorrectly detected be submitted to Symantec Security Response. For instructions on how to do this using Scan and Deliver, read Submit Virus Samples
Symantec Security Response encourages all users and administrators to adhere to the following basic security "best practices":