Even if it doesn't seem to cause any harm, users should get rid of botnet malware as soon as possible, since otherwise they may become accomplices in the cybercriminals´ activities, the expert added.

Trojans got their name from the legendary wooden horse built by the Greeks to defeat Troy. They pretend to serve users, but in fact they are designed to cheat their victims. Many trojans set off (fake) alarm bells warning the user of a virus infection, and then download a rogue antivirus application.

The downloaded program promises to clean the machine, but it either does nothing (the better option), or starts some malicious activity. The user is often charged for such a download, so these trojans are, in fact, tools for fraud. They mostly come in e-mail attachments. Spammers disguise them as some useful file, such as an order confirmation. Opening the attachment, however, launches the infection mechanism.

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Source: VirusBuster