The Autoprotect and Download Insight of the SEP client 12.1 seem to be working.
Why some threats are only detected after being downloaded to the machine while others are blocked during the download attempt?
Files can be downloaded using one of two available methods:
Type 1: serial download - "traditional" downloads
Type 2: random chunks download - typical for communities file sharing downloads and download managers
When files are download using method 1, it will be possible to match a threat pattern during the download phase. If files are downloaded using method 2, the random chunks have to be reassembled to form a file, only then a threat can exist and be detected.
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