Trojan (Malware)

A Trojan is a type of malware that hides inside, or pretends to be, a harmless program, named after the wooden horse that Greek soldiers used to enter the city of Troy. Unlike a virus or worm, a Trojan does not usually spread by itself; it relies on the victim being persuaded to install it, for example through a fake app, a pirated program, an email attachment or a bogus software update. Once running, it can open a backdoor for remote control, record keystrokes like a keylogger, spy on activity like spyware or download further threats such as ransomware. Banking Trojans overlay fake login screens on genuine apps to steal credentials, and crypto-focused versions swap copied wallet addresses or harvest seed phrases. Defences include installing software only from official sources, keeping systems updated and using anti-malware tools.