Trojan or Trojan horse can be considered as a program with a hidden intent or agenda. It is a malware which is responsible for huge amounts of data loss and system failures around the world. To trojan a program would be to add subversive functions to a program making it potentially dangerous and a tool most often used by hackers.
The name Trojan has been taken from the classical tale of "Trojan house" used in the legendary war. It was coined by Daniel Edwards of NSA who was credited first to have discovered such programs in his report "Computer Security Technology Planning Study". Trojans are classified on the basis of the way they attack into 6 trojan payloads : Remote Access , Data Destruction , Downloader ,Server Trojan, Security software disabler, Denial of Service attack.
They cause lot of damage in the form of data destruction, corrupting files, disabling security features, downloading and uploading files, key logging etc.
Due to these reasons protecting our system from trojans is of utmost importance and hence the trojan removal facilities has been included in all leading anti-virus programs. Sometimes separates patches may have to be downloaded and used to remove certain particular trojans as well. Due to the vast number of trojans reaching the internet each day one can never assume a system to be fully safe from its clutches.
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