As many of you know, ClamAV has a limit on the maximum file size that may be scanned. The default max file size is 100MB in the latest release. You can raise the limit up to 2000MB (2GB). But it cannot be set higher at this time. Some users who have a requirement to scan much larger files (and can tolerate the extended scan times required) have needed to work around this limitation on their own, but now we can offer a new alternative.
We have created the ClamAV Large Archive Scanner utility in order to meet that need in the case where these files consist of large archives or disk images. https://github.com/Cisco-Talos/clamav-large-archive-scanner The ClamAV Large Archive Scanner utility is a wrapper around the ClamAV clamd and clamdscan programs that provides a way to scan archives which exceed ClamAV's maximum file size limit. The ClamAV Large Archive Scanner makes use of system utilities to recursively extract or mount large archives, as needed and then scan the contents. You may run the ClamAV Large Archive Scanner in your local environment, or you may run the utility in a Docker container. The Docker container is easier. The ClamAV Large Archive Scanner supports extraction or mounting of the following types of archives: * TAR * ZIP * ISO * VMDK * TARGZ * QCOW2 Disclaimer: The ClamAV Large Archive Scanner is NOT intended as a replacement for clamscan or clamd. It was created as a workaround for people who absolutely need to scan archives larger than 2000MB, until such a time as we can increase or eliminate ClamAV's hard limit for max file size. We have no intention of trying to make this tool match all of the features in clamscan or clamd. If the content you are scanning is smaller than 2GB, then this tool is not for you and will only add overhead to your scanning process. Regards, Micah Snyder Micah Snyder (they/them) ClamAV Development Talos Cisco Systems, Inc.
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