Reporting malware samples to the Avast Threat Lab

Avast Antivirus protects your PC via technology that proactively detects threats, such as malicious websites and files, and stops them from attacking your system. Acquiring samples of malicious code enables us to provide this protection by continuously updating our products to recognize new threats before they can infect your devices.

If you encounter a suspicious website or file, we encourage you to submit it to our Avast Threat Lab for analysis and further action if required. This article answers common questions related to submitting malware samples to us.

Who can submit files and websites?

Anyone can submit files and websites to the Avast Threat Lab for analysis. Our automated system check all submitted files and websites for malicious or potentially unwanted activity, then take one of the following actions:

  1. If the system determines that the file or website is malicious, the file or website is blocked by our virus definition updates.
  2. If the system cannot determine whether the file or website is malicious, the file or website is sent to our Avast Threat Lab for manual analysis.

Files and websites that require manual analysis are prioritized according to their level of severity and the number of users the file or website may harm. After manual analysis, the file or website is categorized as safe or harmful.

What types of files can I submit?

We encourage you to send us any type of file that you believe may be malicious.

We do not send replies following file submissions or evaluations.

How can I submit files?

Submit suspicious files to the Avast Threat Lab using the file submission form.

To submit multiple files, send them as single, compressed files (for example, in ZIP, RAR, or 7z format). For more information, refer to the following article:

If you are unable to use the submission form, attach the file to an email and send it to submit@virus.avast.com with the subject line Undetected Malware. For files that are larger than 50 MB, use the anonymous FTP server.

How can I submit websites?

Notify the Avast Threat Lab of suspicious websites by sending an email to submit@virus.avast.com with the subject line Undetected Malware. In the body of your message, include your reason for notifying us of the website, and the full URL. To report multiple websites, send one email and include the full url of each website and reasons for submitting them.

How can I submit samples that are too large?

If the file you want to submit to us is larger than 50 MB, upload it to our anonymous FTP server. After uploading a file to our FTP server, send an email to virus@avast.com and specify the file name.

For detailed instructions about how to use our anonymous FTP server to upload samples, refer to the following article:

Can I submit samples confidentially?

Avast does not collect any personal information about you when you submit files and websites to the Avast Threat Lab. All submitted files and websites are used to improve our software's ability to protect our users from threats.

To upload a malware sample confidentially, upload the file to our anonymous FTP server.

  • All available Avast antivirus software
  • All supported operating systems

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