As previously stated, malware is an umbrella term that covers multiple security threats.

Infectious malware is comprised of viruses and worms, while Trojans, backdoors and rootkits are concealed pieces of malicious code. Last, but not least, malware for profit gathers spyware, botnets, keystroke loggers, as well as telephony dialers.

1. Viruses

Computer viruses are pieces of software that can replicate themselves and stealthily infect the host computer. Due to the fact that viruses are associated with destructive behaviors, they are wrongfully used to define multiple types of malware. Depending on its complexity, the initial virus may modify its next copies, in order to escape the simple string detection algorithms in antivirus software. Viruses can spread using either the network / Internet, or by infecting files on removable media (floppy disk, CD or USB drives).

About the author


Bogdan Botezatu is living his second childhood at Bitdefender as senior e-threat analyst. When he is not documenting sophisticated strains of malware or writing removal tools, he teaches extreme sports such as surfing the web without protection or rodeo with wild Trojan horses. He believes that most things in life can be beat with strong heuristics and that antimalware research is like working for a secret agency: you need to stay focused at all times, but you get all the glory when you catch the bad guys.