What Is A Trojan Horse Virus?

A computer trojan horse virus is a program (virus) which spreads by fooling an unsuspecting user into executing it. It appears to be something good and interesting but actually conceals something malicious. For e.g. a simple Trojan horse virus could be a program named 'waterfalls.scr.exe' claiming to be free waterfalls screensavers which, when executed it begins to erase all the files on the computer.

The term came from the classical myth of the Trojan horse. The Trojans believed that the horse left by the Greeks to be a gift from Odysseus as a symbol of friendship and peace. Instead, the horse was filled with Greek warriors.

Another common way of sending a trojan horse virus is through email which required the user to open the attachment in MS Outlook to activate. The attacker will send the attachment naming something interesting like 'preetygirls.exe.' Once activated, the trojan horse virus would send copies of itself to people in the MSOutlook address book.

The Trojan horse itself would typically be a Windows executable program file, and thus must have an executable filename extension such as .exe, .com, .scr, .bat, or .pif. Since Windows is sometimes configured by default to hide filename extensions from a user, the Trojan horse is an extension that might be "masked" by giving it a name such as 'Readme.txt.exe'. When the recipient double-clicks on the attachment, the trojan horse might superficially do what the user expects it to do (open a text file, for example), so as to keep the victim unaware of its real, concealed, objectives.

Anti virus programs can detect known trojan horses and update it regularly. If there is an auto-update option included in your anti virus program you should turn it on. If you receive e-mail from someone you do not know or you receive an unknown attachment never open it right away. Confirm the source.

A Trojan Horse is an email virus usually
released by an email attachment. If opened, it will scour your hard drive for
any personal and financial information such as your social security, account,
and PIN numbers. Once it has collected your info, it is sent to a thief’s database.

Trojan Horse Virus, also known as Trojan, is another type of malware named after the wooden horse that the Greeks used to infiltrate Troy. It is a harmful piece of software that looks legitimate. Users are typically tricked into loading and executing it on their systems. After it is activated, it can achieve any number of attacks on the host, from irritating the user (popping up windows or changing desktops) to damaging the host (deleting files, stealing data, or activating and spreading other malware, such as viruses). Trojans are also known to create backdoors to give malicious users access to the system. Unlike viruses and worms, Trojans do not reproduce by infecting other files nor do they self-replicate. Trojans must spread through user interaction such as opening an email attachment or downloading and running a file from the Internet.