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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.
RavMonE, also known as RJump, is a Trojan that opens a backdoor on computers running Microsoft Windows.Once a computer is infected, the virus allows unauthorized users to gain access to the computer's contents.
A backdoor is a typically covert method of bypassing normal authentication or encryption in a computer, product, embedded device (e.g. a home router), or its embodiment (e.g. part of a cryptosystem, algorithm, chipset, or even a "homunculus computer"—a tiny computer-within-a-computer such as that found in Intel's AMT technology).
An example of a virus that informs the owner of the infected machine to pay a ransom is the virus nicknamed Tro_Ransom.A. [9] This virus asks the owner of the infected machine to send $10.99 to a given account through Western Union. Virus.Win32.Gpcode.ag is a classic cryptovirus. [10]
The first IBM PC virus in the wild was a boot sector virus dubbed (c)Brain, created in 1986 by the Farooq Alvi brothers in Pakistan. [14] Malware distributors would trick the user into booting or running from an infected device or medium. For example, a virus could make an infected computer add autorunnable code to any USB stick plugged into it.
Computer viruses generally require a host program. [11] The virus writes its own code into the host program. When the program runs, the written virus program is executed first, causing infection and damage. A worm does not need a host program, as it is an independent program or code chunk.
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.
Hupigon (also Graftor) detected as (Backdoor.Win32.Hupigon, Trojan.Win32.Hupigon, Backdoor.Win32.Graftor, and Trojan.Win32.Graftor) is a backdoor Trojan. Its first known detection goes back to November 2008, according to Securelist from Kaspersky Labs .