Trojan-downloader malware known as Trojan-Downloader.Win32.win32.Diehard has surged to the top of Kaspersky Labs “Virus Top Twenty” list for December because of its “explosive propagation” The worst virus of the month in terms of sightings was not the Diehard downloader but a variant on the old NetSky.q worm that is still spreading almost four years after being discovered. Security firm says “classic e-mail worms” may still rank high, but they tend to quickly disappear.”]
Source: https://www.csoonline.com/article/2122563/network-world—diehard–virus-variants-flexing-muscle.html