Because antivirus software relies heavily on constantly updated "signatures" (cloud-based definitions), having the underlying engine code didn't automatically grant the ability to bypass new detections. A Lesson in Insider Threats
KASPERSKY.AV.2008.SRCS.ELCRABE.RAR is the filename of a widely circulated archive containing the leaked source code for Kaspersky Anti-Virus products from the 2008 era. The leak gained major public attention in January 2011 when the archive was uploaded to public file-sharing sites and torrent trackers like The Pirate Bay. 看雪安全社区 Origin and Background Source of the Leak KASPERSKY.AV.2008.SRCS.ELCRABE.RAR
Competitors or malicious actors can gain insight into proprietary algorithms, such as the advanced heuristic analysis that Kaspersky was famous for. The "El_Crabe" Legacy 看雪安全社区 Origin and Background Source of the Leak
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, which was Kaspersky's primary antivirus engine at the time.