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Before deletion of any malware undetected by avast, ensure you send a sample to avast to help improve detection.

Send the sample to virus@avast.com zipped and password protected with password in email body and undetected malware in the subject. Or you can also add the file to the User Files (File, Add) section of the avast chest where it can do no harm and send it from there (select the file, right click, email to Alwil Software). No need to zip and PW protect when the sample is sent from chest.