A free file hosting Mlfat4arab posted the source code of the product Kaspersky Lab. Experts claim it contained “a fragment of an older version of the antivirus engine, which had previously been circulated in closed hacking resources. Despite the poor quality of the leak, this case can still be called unprecedented for a company that deals with security. Antivirus kernel – the cornerstone of any business’s security company, and its source code, it tries to protect more than your financial records.
Source: https://thehackernews.com/2011/01/kasperskys-security-suite-source-code.html