Researchers have discovered an extremely rare form of “fileless” malware that executes entirely in memory without the need to save any files to the hard drive of a victim’s PC. The latest discovery was made by Kaspersky Lab, which received reports of a malware attack hitting a common Java vulnerability (CVE-2011-3544) on Russian websites. The malware is reminiscent of the infamous Code Red and Slammer worms of a decade ago, but both were built simply to spread as far and fast as possible.”]
Source: https://www.csoonline.com/article/2131218/researchers-find-new-type-of–fileless–malware.html