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In computing, a Trojan horse (or simply Trojan) is a malware that misleads users of its true intent by disguising itself as a normal program. The term is derived from the ancient Greek story of the deceptive Trojan Horse that led to the fall of the city of Troy. [1] Trojans are generally spread by some form of social engineering.
Microsoft subsequently modified the hotfix to prevent installation if an Alureon infection is present, [7] The malware author(s) also fixed the bug in the code. In November 2010, the press reported that the rootkit had evolved to the point that it was bypassing the mandatory kernel-mode driver signing requirement of 64-bit editions of Windows 7 .
The malware is able to modify the code on PLC devices unnoticed, and subsequently to mask its presence from WinCC if the control software attempts to read an infected block of memory from the PLC system. [67] The malware furthermore used a zero-day exploit in the WinCC/SCADA database software in the form of a hard-coded database password. [75]
Graybird is a Trojan horse that hides its presence on compromised computers and downloads files from remote Web sites. There are many variations of this virus. It was discovered on September 3, 2003 and affects Windows 2000, Windows 95, Windows 98, Windows Me, Windows NT, Windows Server 2003, Windows XP, and Windows Vista.
Zeus is very difficult to detect even with up-to-date antivirus and other security software as it hides itself using stealth techniques. [5] It is considered that this is the primary reason why the Zeus malware has become the largest botnet on the Internet: Damballa estimated that the malware infected 3.6 million PCs in the U.S. in 2009. [6]
Examples of e-mails with "Storm Worm" in the attachment. The Storm Worm (dubbed so by the Finnish company F-Secure) is a phishing backdoor [1] [2] Trojan horse that affects computers using Microsoft operating systems, [3] [4] [5] discovered on January 17, 2007. [3] The worm is also known as: Small.dam or Trojan-Downloader.Win32.Small.dam ; CME-711
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