User manual

Viruses and more
Avira Professional Security - User Manual (Status: 14 Dec. 2012) 88
which differentiates them from viruses and worms. Most of them have an interesting name
(SEX.EXE or STARTME.EXE) with the intention to induce the user to start the Trojan.
Immediately after execution they become active and can, for example, format the hard
disk. A dropper is a special form of Trojan that 'drops' viruses, i.e. embeds viruses on the
computer system.
Zombie
A zombie PC is a computer that is infected with malware programs and that enables
hackers to abuse computers via remote control for criminal purposes. On command, the
affected PC starts denial-of-service (DoS) attacks, for example, or sends spam and
phishing emails.