What is a Trojan virus?

The short answer

A Trojan virus is harmful software disguised as a normal app or file so you run it yourself.

How it works

A Trojan usually looks like something useful, such as:

• A fake software update
• A cracked app or game
• An email attachment that seems important

Once opened, it can:

• Steal passwords or bank details
• Spy on what you type
• Install more malware
• Give someone remote control of your device

Why it is called a “Trojan”

The name comes from the Trojan Horse story: danger hidden inside something that looks harmless.

When should you worry?

Watch for signs like:

• Your device suddenly slows down
• Unknown apps appear
• Browser redirects or pop-ups increase
• Accounts show logins you did not make
• Security software gets turned off

How to fix it

1. Disconnect from the internet to limit damage.
2. Run a trusted antivirus scan and remove threats.
3. Uninstall suspicious apps you did not intend to install.
4. Change important passwords from a clean device.
5. Turn on automatic updates for your OS and apps.

How to avoid Trojans

• Download only from official sources
• Do not open unexpected attachments
• Avoid pirated software and “free cracks”
• Keep backups so recovery is easier if something goes wrong