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Who Writes Malicious Programs and Why?
Virus writers: four general types
Virus writers belong to one of four broad groups: cyber-vandals, who can be divided into two categories, and more serious programmers, who can again be split into two groups.
Cyber vandalism - stage 1
In the past, most malware was written by young programmers: kids who just had learned to program who wanted to test their skills. Fortunately most of these programs did not spread widely - the majority of such malware died when disks were reformatted or upgraded. Viruses like these were not written with a concrete aim or a definite target, but simply for the writers to assert themselves.
Cyber vandalism - stage 2
The second largest group of contributors to malware coding were young people, usually students. They were still learning programming, but had already made a conscious decision to devote their skills to virus writing. These were people who had chosen to disrupt the computing community by committing acts of cyber hooliganism and cyber vandalism. Viruses authored by members of this group were usually extremely primitive and the code contained a large number of errors.
Professional virus writers
And then these 'script kiddies' grew up. Unfortunately, some of them did not grow out of virus writing. Instead, they looked for commercial applications for their dubious talents. This group remains the most secretive and dangerous section of the computer underground: they have created a network of professional and talented programmers who are very serious about writing and spreading viruses.
Virus researchers: the 'proof-of-concept' malware authors
The fourth and smallest group of virus writers is rather unusual. These virus writers call themselves researchers, and they are often talented programmers who devote their skills to developing new methods for penetrating and infecting systems, fooling antivirus programs and so forth. They are usually among the first to penetrate new operating systems and hardware. Nevertheless, these virus writers are not writing viruses for money, but for research purposes. They usually do not spread the source code of their 'proof of concept viruses', but do actively discuss their innovations on Internet resources devoted to virus writing.
Why write viruses?
The computer underground has realised that paid for Internet services, such as Internet access, email and web hosting, provides new opportunities for illegal activity with the additional satisfaction of getting something for nothing. Virus writers have authored a range of Trojans which steal login information and passwords to gain free access to other users' Internet resources.
Organised cyber crime
The most dangerous virus writers are individuals and groups who have turned professional. These people either extract money directly from end users (either by theft or by fraud) or use zombie machines to earn money in other ways, such as creating and selling a spamming platform, or organizing DoS attacks, with the aim here being blackmail.
Currently, virus writers either work for particular spammers or sell their wares to the highest bidder. Today, one standard procedure is for virus writers to create bot networks, i.e. networks of zombie computer infected with identical malicious code. In the case of networks used as spamming platforms, a Trojan proxy server will penetrate the victim machines. These networks number from a thousand to tens of thousands of infected machines. The virus writers then sell these networks to the highest bidder in the computer underground.
Apart from servicing spam and adware, professional virus writers also create Tojan spies which they use to steal money from e-wallets, Pay Pal accounts and/or directly from Internet bank accounts. These Trojans harvest banking and payment information from local machines or even corporate servers and then forward it to the master.
The third major form of contemporary cyber crime is extortion or Internet rackets. Usually, virus writers create a network of zombie machines capable of conducting an organized DoS attack. Then they blackmail companies by threatening to conduct a DoS attack against the corporate website. Popular targets include estores, banking and gambling sites, i.e. companies whose revenues are generated directly by their on-line presence.
Virus writers and hackers also ensure that adware, dialers, utilities that redirect browsers to pay-to-view sites and other types of unwanted software function efficiently. Such programs can generate profits for the computer underground, so it's in the interests of virus writers and hackers to make sure that these programs are not detected and are regularly updated.