W32.Extrat!gen1 is a heuristic detection used to detect threats associated with the W32.Extrat
family of worms.
Files that are detected as W32.Extrat!gen1 are considered malicious. We suggest that any files you believe are incorrectly detected as W32.Extrat!gen1 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":