Server. 2. Beast Trojan (2002) Beast is a Windows-based backdoor trojan horse more commonly known in the underground cracker community as a RAT (Remote Administration Tool). It was created in Delphi and released first by its author Tataye in 2002. Beast was one of the first trojans to feature a 'reverse connection' to its victims and once established, it gave the attacker complete control over the infected computer. Once connected to the victim computer, via Beast hacker can access victim's all computer file and directories along with the power to upload, download, delete or execute any file or folder. 3. SQL Slammer (2003) ALIAS: Sapphire, Worm.SQL.Helkern, SQLSlammer Appeared first in 27th January 2003 and soon got a high rank in the list of most dangerous worms of the year because it is the first fileless worm. Slammer was able to spread by taking advantage of the vulnerability found in the SQL Server. ]