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Title: Malware  
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Subject: Mobile security, Form grabbing, Asprox botnet, Trojan horse (computing), Computer security
Collection: Malware
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Beast, a Windows-based backdoor Trojan horse.

Malware, short for malicious software, is any software used to disrupt computer operation, gather sensitive information, or gain access to private computer systems.[1] It can appear in the form of executable code, scripts, active content, and other software.[2] 'Malware' is a general term used to refer to a variety of forms of hostile or intrusive software.[3] The term badware is sometimes used, and applied to both true (malicious) malware and unintentionally harmful software.[4]

Malware may be stealthy, intended to steal information or spy on computer users for an extended period without their knowledge, as for example Regin, or it may be designed to cause harm, often as sabotage (e.g., Stuxnet), or to extort payment (CryptoLocker). Malware includes computer viruses, worms, trojan horses, ransomware, spyware, adware, scareware, and other malicious programs. As of 2011 the majority of active malware threats were worms or trojans rather than viruses.[5] In law, malware is sometimes known as a computer contaminant, as in the legal codes of several U.S. states.[6][7] Malware is often disguised as, or embedded in, non-malicious files.

Spyware or other malware is sometimes found embedded in programs supplied officially by companies, e.g., downloadable from websites, that appear useful or attractive, but may have, for example, additional hidden tracking functionality that gathers marketing statistics.

An example of such software, which was described as illegitimate, is the Sony rootkit, a Trojan embedded into CDs sold by Sony, which silently installed and concealed itself on purchasers' computers with the intention of preventing illicit copying; it also reported on users' listening habits, and unintentionally created vulnerabilities that were exploited by unrelated malware.[8]

The term malware only applies to software that intentionally causes harm. Software that causes harm due to bugs or poor design are not classified as malware; for example some legitimate software written before the year 2000 had errors that caused serious malfunctions when the year changed from 1999 to 2000 – these programs are not considered malware.

Software such as

  • Malicious Software at DMOZ
  • Further Reading: Research Papers and Documents about Malware on IDMARCH (Int. Digital Media Archive)
  • Advanced Malware Cleaning - a Microsoft video

External links

  1. ^ "Malware definition". Retrieved 26 August 2013. 
  2. ^ "An Undirected Attack Against Critical Infrastructure" (PDF).  
  3. ^ "Defining Malware: FAQ". Retrieved 10 September 2009. 
  4. ^ stop badware Web site: What is badware?
  5. ^ "Evolution of Malware-Malware Trends". Microsoft Security Intelligence Report-Featured Articles. Retrieved 28 April 2013. 
  6. ^ "Virus/Contaminant/Destructive Transmission Statutes by State".  
  7. ^ "§18.2-152.4:1 Penalty for Computer Contamination" (PDF). Joint Commission on Technology and Science. Retrieved 17 September 2010. 
  8. ^ Russinovich, Mark (2005-10-31). "Sony, Rootkits and Digital Rights Management Gone Too Far". Mark's Blog. Microsoft MSDN. Retrieved 2009-07-29. 
  9. ^ "Protect Your Computer from Malware". Retrieved 26 August 2013. 
  10. ^ "Malware". FEDERAL TRADE COMMISSION- CONSUMER INFORMATION. Retrieved 27 March 2014. 
  11. ^ Hernandez, Pedro. "Microsoft Vows to Combat Government Cyber-Spying". eWeek. Retrieved 15 December 2013. 
  12. ^ Kovacs, Eduard. "MiniDuke Malware Used Against European Government Organizations". Softpedia. Retrieved 27 February 2013. 
  13. ^ "'"South Korea network attack 'a computer virus. BBC. Retrieved 20 March 2013. 
  14. ^ "Malware Revolution: A Change in Target". March 2007. 
  15. ^ "Child Porn: Malware's Ultimate Evil". November 2009. 
  16. ^ PC World - Zombie PCs: Silent, Growing Threat.
  17. ^ "Peer To Peer Information". NORTH CAROLINA STATE UNIVERSITY. Retrieved 25 March 2011. 
  18. ^ Microsoft TechNet Blogs, Microsoft Malware Protection Center: Another way Microsoft is disrupting the malware ecosystem, 29 November 2012
  19. ^ Computer Weekly: Shamoon is latest malware to target energy sector
  20. ^ Computer Weekly: Computer-killing malware used in Sony attack a wake-up call
  21. ^ "Symantec Internet Security Threat Report: Trends for July–December 2007 (Executive Summary)" (PDF) XIII. Symantec Corp. April 2008. p. 29. Retrieved 11 May 2008. 
  22. ^ "F-Secure Reports Amount of Malware Grew by 100% during 2007" (Press release). F-Secure Corporation. 4 December 2007. Retrieved 11 December 2007. 
  23. ^ "F-Secure Quarterly Security Wrap-up for the first quarter of 2008". F-Secure. 31 March 2008. Retrieved 25 April 2008. 
  24. ^ "Continuing Business with Malware Infected Customers". Gunter Ollmann. October 2008. 
  25. ^ "New Research Shows Remote Users Expose Companies to Cybercrime". Webroot. April 2013. 
  26. ^ "Symantec names Shaoxing, China as world's malware capital". Engadget. Retrieved 15 April 2010. 
  27. ^ Rooney, Ben (2011-05-23). "Malware Is Posing Increasing Danger". Wall Street Journal. 
  28. ^ Suarez-Tangil, Guillermo; Juan E. Tapiador, Pedro Peris-Lopez, Arturo Ribagorda (2014). "Evolution, Detection and Analysis of Malware in Smart Devices". IEEE Communications Surveys & Tutorials. 
  29. ^ "computer virus - Encyclopedia Britannica". Retrieved 28 April 2013. 
  30. ^ "All about Malware and Information Privacy"
  31. ^ McDowell, Mindi. "Understanding Hidden Threats: Rootkits and Botnets". US-CERT. Retrieved 6 February 2013. 
  32. ^ "". Retrieved 15 April 2010. 
  33. ^ Vincentas (11 July 2013). "Malware in". Spyware Loop. Retrieved 28 July 2013. 
  34. ^ Staff, SPIEGEL. "Inside TAO: Documents Reveal Top NSA Hacking Unit". SPIEGEL. Retrieved 23 January 2014. 
  35. ^ Edwards, John. "Top Zombie, Trojan Horse and Bot Threats". IT Security. Retrieved 25 September 2007. 
  36. ^ Appelbaum, Jacob. "Shopping for Spy Gear:Catalog Advertises NSA Toolbox". SPIEGEL. Retrieved 29 December 2013. 
  37. ^ "Global Web Browser... Security Trends". Kaspersky lab. November 2012. 
  38. ^ Rashid, Fahmida Y. (27 November 2012). "Updated Browsers Still Vulnerable to Attack if Plugins Are Outdated". 
  39. ^ Danchev, Dancho (18 August 2011). "Kaspersky: 12 different vulnerabilities detected on every PC". 
  40. ^ "Adobe Security bulletins and advisories". Retrieved 19 January 2013. 
  41. ^ Rubenking, Neil J. "Secunia Personal Software Inspector 3.0 Review & Rating". Retrieved 19 January 2013. 
  42. ^ a b c CNet: USB devices spreading viruses - Defense Department suspends use of USB drives as experts warn of USB-related virus outbreaks, 21 November 2008
  43. ^ "LNCS 3786 - Key Factors Influencing Worm Infection", U. Kanlayasiri, 2006, web (PDF): SL40-PDF.
  44. ^ "Microsoft Security Essentials". Microsoft. Retrieved 21 June 2012. 
  45. ^ "Malicious Software Removal Tool". Microsoft. Retrieved 21 June 2012. 
  46. ^ "Windows Defender". Microsoft. Retrieved 21 June 2012. 
  47. ^ a b Rubenking, Neil J. (8 January 2014). "The Best Free Antivirus for 2014". 
  48. ^ "How do I remove a computer virus?". Microsoft. Retrieved 26 August 2013. 
  49. ^ "Microsoft Safety Scanner". Microsoft. Retrieved 26 August 2013. 
  50. ^ "Glasswall". Glasswall. 
  51. ^ "Nexor Merlin". Nexor. 
  53. ^ "An example of a website vulnerability scanner". Retrieved 19 January 2013. 
  54. ^ "Redleg's File Viewer. Used to check a webpage for malicious redirects or malicious HTML coding". Retrieved 19 January 2013. 
  55. ^ "Example Safe Browsing Diagnostic page". Retrieved 19 January 2013. 
  56. ^ "Safe Browsing (Google Online Security Blog)". Retrieved 21 June 2012. 
  57. ^ Hanspach, Michael; Goetz, Michael (November 2013). "On Covert Acoustical Mesh Networks in Air". Journal of Communications.  
  58. ^ Vincentas (11 July 2013). "Grayware in". Spyware Loop. Retrieved 28 July 2013. 
  59. ^ "Threat Encyclopedia - Generic Grayware". Trend Micro. Retrieved 27 November 2012. 
  60. ^ "Rating the best anti-malware solutions". Arstechnica. Retrieved 28 January 2014. 
  61. ^ Nick Farrell (20 February 2006). "Linux worm targets PHP flaw". The Register. Retrieved 19 May 2010. 
  62. ^ John Leyden (28 March 2001). "Highly destructive Linux worm mutating". The Register. Retrieved 19 May 2010. 
  63. ^ "Aggressive net bug makes history". BBC News. 3 February 2003. Retrieved 19 May 2010. 
  64. ^ John von Neumann, "Theory of Self-Reproducing Automata", Part 1: Transcripts of lectures given at the University of Illinois, December 1949, Editor: A. W. Burks, University of Illinois, USA, 1966.
  65. ^ Fred Cohen, "Computer Viruses", PhD Thesis, University of Southern California, ASP Press, 1988.


See also

The notion of a self-reproducing computer program can be traced back to initial theories about the operation of complex automata.[64] John von Neumann showed that in theory a program could reproduce itself. This constituted a plausibility result in computability theory. Fred Cohen experimented with computer viruses and confirmed Neumann's postulate and investigated other properties of malware such as detectability, self-obfuscation using rudimentary encryption, and others. His Doctoral dissertation was on the subject of computer viruses.[65]

Academic research

Today, worms are most commonly written for the Windows OS, although a few like Mare-D[61] and the L10n worm[62] are also written for Linux and Unix systems. Worms today work in the same basic way as 1988's Internet Worm: they scan the network and use vulnerable computers to replicate. Because they need no human intervention, worms can spread with incredible speed. The SQL Slammer infected thousands of computers in a few minutes in 2003.[63]

With the rise of the Microsoft Windows platform in the 1990s, and the flexible macros of its applications, it became possible to write infectious code in the macro language of Microsoft Word and similar programs. These macro viruses infect documents and templates rather than applications (executables), but rely on the fact that macros in a Word document are a form of executable code.

The first worms, network-borne infectious programs, originated not on personal computers, but on multitasking Unix systems. The first well-known worm was the Internet Worm of 1988, which infected SunOS and VAX BSD systems. Unlike a virus, this worm did not insert itself into other programs. Instead, it exploited security holes (vulnerabilities) in network server programs and started itself running as a separate process. This same behavior is used by today's worms as well.

Before Internet access became widespread, viruses spread on personal computers by infecting the executable boot sectors of floppy disks. By inserting a copy of itself into the machine code instructions in these executables, a virus causes itself to be run whenever a program is run or the disk is booted. Early computer viruses were written for the Apple II and Macintosh, but they became more widespread with the dominance of the IBM PC and MS-DOS system. Executable-infecting viruses are dependent on users exchanging software or boot-able floppies and thumb drives so they spread rapidly in computer hobbyist circles.

History of viruses and worms

Another term, PUP, which stands for Potentially Unwanted Program (or PUA Potentially Unwanted Application),[60] refers to applications that would be considered unwanted despite often having been downloaded by the user, possibly after failing to read a download agreement. PUPs include spyware, adware, fraudulent dialers. Many virus checkers classify unauthorised key generators as grayware, although they frequently carry true malware in addition to their ostensible purpose.

It describes applications that behave in an annoying or undesirable manner, and yet are less serious or troublesome than malware. Grayware encompasses spyware, adware, fraudulent dialers, joke programs, remote access tools and other unwanted programs that harm the performance of computers or cause inconvenience. The term came into use around 2004.[59]

Grayware is a term applied to unwanted applications or files that are not classified as malware, but can worsen the performance of computers and may cause security risks.[58]


As a last resort, computers can be protected from malware, and infected computers can be prevented from disseminating trusted information, by imposing an "air gap" (i.e. completely disconnecting them from all networks). However, information can be transmitted in unrecognised ways; in December 2013 researchers in Germany showed one way that an apparent air gap can be defeated.[57]

"Air gap" isolation

As malware also harms the compromised websites (by breaking reputation, blacklisting in search engines, etc.), some websites offer vulnerability scanning.[53][54][55][56] Such scans check the website, detect malware, may note outdated software, and may report known security issues.

Website security scans

Typical malware products detect issues based on heuristics or signatures – i.e., based on information that can be assessed to be bad. Some products[50][51] take an alternative approach when scanning documents such as Word and PDF, by regenerating a new, clean file, based on what is known to be good from schema definitions of the file (a patent for this approach exists).[52]

Known good

Hardware implants can be of any type, so there can be no general way to detect them.

Some viruses disable System Restore and other important Windows tools such as Task Manager and Command Prompt. Many such viruses can be removed by rebooting the computer, entering Windows safe mode with networking,[48] and then using system tools or Microsoft Safety Scanner.[49]

Examples of Microsoft Windows antivirus and anti-malware software include the optional Microsoft Security Essentials[44] (for Windows XP, Vista, Windows 7 and Windows 8) for real-time protection, the Windows Malicious Software Removal Tool[45] (now included with Windows (Security) Updates on "Patch Tuesday", the second Tuesday of each month), and Windows Defender (an optional download in the case of Windows XP).[46] Additionally, several capable antivirus software programs are available for free download from the Internet (usually restricted to non-commercial use).[47] Tests found some free programs to be competitive with commercial ones.[47] Microsoft's System File Checker can be used to check for and repair corrupted system files.

Real-time protection from malware works identically to real-time antivirus protection: the software scans disk files at download time, and blocks the activity of components known to represent malware. In some cases, it may also intercept attempts to install start-up items or to modify browser settings. Because many malware components are installed as a result of browser exploits or user error, using security software (some of which are anti-malware, though many are not) to "sandbox" browsers (essentially isolate the browser from the computer and hence any malware induced change) can also be effective in helping to restrict any damage done.

  1. They can provide real time protection against the installation of malware software on a computer. This type of malware protection works the same way as that of antivirus protection in that the anti-malware software scans all incoming network data for malware and blocks any threats it comes across.
  2. Anti-malware software programs can be used solely for detection and removal of malware software that has already been installed onto a computer. This type of anti-malware software scans the contents of the Windows registry, operating system files, and installed programs on a computer and will provide a list of any threats found, allowing the user to choose which files to delete or keep, or to compare this list to a list of known malware components, removing files that match.

Anti-malware programs can combat malware in two ways:

A specific component of the anti-virus and anti-malware software commonly referred as the on-access or real-time scanner, hooks deep into the operating system's core or kernel functions in a manner similar to how certain malware itself would attempt to operate, though with the user's informed permission for protecting the system. Any time the operating system accesses a file, the on-access scanner checks if the file is a 'legitimate' file or not. If the file is considered a malware by the scanner, the access operation will be stopped, the file will be dealt by the scanner in pre-defined way (how the Anti-virus program was configured during/post installation) and the user will be notified. This may considerably slow down the operating system depending on how well the scanner was programmed. The goal is to stop any operations the malware may attempt on the system before they occur, including activities which might exploit bugs or trigger unexpected operating system behavior.

Anti-virus and anti-malware software

As malware attacks become more frequent, attention has begun to shift from viruses and spyware protection, to malware protection, and programs that have been specifically developed to combat malware. (Other preventive and recovery measures, such as backup and recovery methods, are mentioned in the computer virus article).

Anti-malware strategies

  • Homogeneity: e.g. when all computers in a network run the same operating system; upon exploiting one, one worm can exploit them all:[43] For example, Microsoft Windows or Mac OS X have such a large share of the market that concentrating on either could enable an exploited vulnerability to subvert a large number of systems. Instead, introducing diversity, purely for the sake of robustness, could increase short-term costs for training and maintenance. However, having a few diverse nodes would deter total shutdown of the network, and allow those nodes to help with recovery of the infected nodes. Such separate, functional redundancy could avoid the cost of a total shutdown.

Use of the same operating system

  • Over-privileged code: some systems allow code executed by a user to access all rights of that user. Also standard operating procedure for early microcomputer and home computer systems. Malware, running as over-privileged code, can use this privilege to subvert the system. Almost all currently popular operating systems, and also many scripting applications allow code too many privileges, usually in the sense that when a user executes code, the system allows that code all rights of that user. This makes users vulnerable to malware in the form of e-mail attachments, which may or may not be disguised.
  • Over-privileged users: some systems allow all users to modify their internal structures. This was the standard operating procedure for early microcomputer and home computer systems, where there was no distinction between an Administrator or root, and a regular user of the system. In some systems, non-administrator users are over-privileged by design, in the sense that they are allowed to modify internal structures of the system. In some environments, users are over-privileged because they have been inappropriately granted administrator or equivalent status.

Over-privileged users and over-privileged code

Older email software would automatically open HTML email containing potentially malicious JavaScript code; users may also execute disguised malicious email attachments and infected executable files supplied in other ways.

This form of infection can largely be avoided by setting up computers by default to boot from the internal hard drive, if available, and not to autorun from devices.[42] Intentional booting from another device is always possible by pressing certain keys during boot.

Malicious software distributors would trick the user into booting or running from an infected device or medium; for example, a virus could make an infected computer add autorunnable code to any USB stick plugged into it; anyone who then attached the stick to another computer set to autorun from USB would in turn become infected, and also pass on the infection in the same way.[42] More generally, any device that plugs into a USB port-—"including gadgets like lights, fans, speakers, toys, even a digital microscope"—can be used to spread malware. Devices can be infected during manufacturing or supply if quality control is inadequate.[42]

Early PCs had to be booted from floppy disks; when built-in hard drives became common the operating system was normally started from them, but it was possible to boot from another boot device if available, such as a floppy disk, CD-ROM, DVD-ROM, or USB flash drive. It was common to configure the computer to boot from one of these devices when available. Normally none would be available; the user would intentionally insert, say, a CD into the optical drive to boot the computer in some special way, for example to install an operating system. Even without booting, computers can be configured to execute software on some media as soon as they become available, e.g. to autorun a CD or USB device when inserted.

Insecure design or user error

Malware authors target bugs, or loopholes, to exploit. A common method is exploitation of a buffer overrun vulnerability, where software designed to store data in a specified region of memory does not prevent more data than the buffer can accommodate being supplied. Malware may provide data that overflows the buffer, with malicious executable code or data after the end; when this payload is accessed it does what the attacker, not the legitimate software, determines.

Malware exploits security defects (security bugs or vulnerabilities) in the design of the operating system, in applications (such as browsers, e.g. older versions of Microsoft Internet Explorer supported by Windows XP[37]), or in vulnerable versions of browser plugins such as Adobe Flash Player, Adobe Acrobat or Reader, or Java (see Java SE critical security issues).[38][39] Sometimes even installing new versions of such plugins does not automatically uninstall old versions. Security advisories from plug-in providers announce security-related updates.[40] Common vulnerabilities are assigned CVE IDs and listed in the US National Vulnerability Database. Secunia PSI[41] is an example of software, free for personal use, that will check a PC for vulnerable out-of-date software, and attempt to update it.

Security defects in software

  • In this context, and throughout, what is called the "system" under attack may be anything from a single application, through a complete computer and operating system, to a large network.
  • Various factors make a system more vulnerable to malware:

Vulnerability to malware

The idea has often been suggested that computer manufacturers preinstall backdoors on their systems to provide technical support for customers, but this has never been reliably verified. It was reported in 2014 that US government agencies had been diverting computers purchased by those considered "targets" to secret workshops where software or hardware permitting remote access by the agency was installed, considered to be among the most productive operations to obtain access to networks around the world.[34] Backdoors may be installed by Trojan horses, worms, implants, or other methods.[35][36]

A backdoor is a method of bypassing normal authentication procedures, usually over a connection to a network such as the Internet. Once a system has been compromised, one or more backdoors may be installed in order to allow access in the future,[33] invisibly to the user.


Each ghost-job would detect the fact that the other had been killed, and would start a new copy of the recently-stopped program within a few milliseconds. The only way to kill both ghosts was to kill them simultaneously (very difficult) or to deliberately crash the system.[32]

Some malicious programs contain routines to defend against removal, not merely to hide themselves. An early example of this behavior is recorded in the Jargon File tale of a pair of programs infesting a Xerox CP-V time sharing system:

Once a malicious program is installed on a system, it is essential that it stays concealed, to avoid detection. Software packages known as rootkits allow this concealment, by modifying the host's operating system so that the malware is hidden from the user. Rootkits can prevent a malicious process from being visible in the system's list of processes, or keep its files from being read.[31]


In the case of some spyware, adware, etc. the supplier may require the user to acknowledge or accept its installation, describing its behavior in loose terms that may easily be misunderstood or ignored, with the intention of deceiving the user into installing it without the supplier technically in breach of the law.

For a malicious program to accomplish its goals, it must be able to run without being detected, shut down, or deleted. When a malicious program is disguised as something normal or desirable, users may unwittingly install it. This is the technique of the Trojan horse or trojan. In broad terms, a Trojan horse is any program that invites the user to run it, concealing harmful or malicious executable code of any description. The code may take effect immediately and can lead to many undesirable effects, such as encrypting the user's files or downloading and implementing further malicious functionality.

Trojan horses


(These categories are not mutually exclusive.)[30] This section only applies to malware designed to operate undetected, not sabotage and ransomware.

Concealment: Viruses, trojan horses, rootkits, and backdoors

The best-known types of malware, viruses and worms, are known for the manner in which they spread, rather than any specific types of behavior. The term computer virus is used for a program that embeds itself in some other executable software (including the operating system itself) on the target system without the users consent and when that is run causes the virus to spread to other executables. On the other hand, a worm is a stand-alone malware program that actively transmits itself over a network to infect other computers. These definitions lead to the observation that a virus requires the user to run an infected program or operating system for the virus to spread, whereas a worm spreads itself.[29]

Infectious malware: viruses and worms

A 2014 study found that malware was increasingly aimed at the ever more popular mobile devices such as smartphones.[28]

On 29 March 2010, Symantec Corporation named Shaoxing, China, as the world's malware capital.[26] A 2011 study from the University of California, Berkeley, and the Madrid Institute for Advanced Studies published an article in Software Development Technologies, examining how entrepreneurial hackers are helping enable the spread of malware by offering access to computers for a price. Microsoft reported in May 2011 that one in every 14 downloads from the Internet may now contain malware code. Social media, and Facebook in particular, are seeing a rise in the number of tactics used to spread malware to computers.[27]

The prevalence of malware as a vehicle for Internet crime, along with the challenge of anti-malware software to keep up with the continuous stream of new malware, has seen the adoption of a new mindset for individuals and businesses using the Internet. With the amount of malware currently being distributed, some percentage of computers are currently assumed to be infected. For businesses, especially those that sell mainly over the Internet, this means they need to find a way to operate despite security concerns. The result is a greater emphasis on back-office protection designed to protect against advanced malware operating on customers' computers.[24] A 2013 Webroot study shows that 64% of companies allow remote access to servers for 25% to 100% of their workforce and that companies with more than 25% of their employees accessing servers remotely have higher rates of malware threats.[25]

Preliminary results from Symantec published in 2008 suggested that "the release rate of malicious code and other unwanted programs may be exceeding that of legitimate software applications."[21] According to F-Secure, "As much malware [was] produced in 2007 as in the previous 20 years altogether."[22] Malware's most common pathway from criminals to users is through the Internet: primarily by e-mail and the World Wide Web.[23]


Malware is usually used for criminal purposes, but can be used for sabotage, often without direct benefit to the perpetrators. One example of sabotage was Stuxnet, used to destroy very specific industrial equipment. There have been politically-motivated attacks that have spread over and shut down large computer networks, including massive deletion of files and corruption of master boot records, described as "computer killing". Such attacks were made on Sony Pictures Entertainment (25 November 2014, using malware known as Shamoon or W32.Disttrack) and Saudi Aramco (August 2012).[19][20]

Some malware is used to generate money by click fraud, making it appear that the computer user has clicked an advertising link on a site, generating a payment from the advertiser. It was estimated in 2012 that about 60 to 70% of all active malware used some kind of click fraud, and 22% of all ad-clicks were fraudulent.[18]

Ransomware affects an infected computer in some way, and demands payment to reverse the damage. For example, programs such as CryptoLocker encrypt files securely, and only decrypt them on payment of a substantial sum of money.

Programs designed to monitor users' web browsing, display unsolicited advertisements, or redirect affiliate marketing revenues are called spyware. Spyware programs do not spread like viruses; instead they are generally installed by exploiting security holes. They can also be packaged together with user-installed software, such as peer-to-peer applications.[17]

Since the rise of widespread broadband Internet access, malicious software has more frequently been designed for profit. Since 2003, the majority of widespread viruses and worms have been designed to take control of users' computers for illicit purposes.[14] Infected "zombie computers" are used to send email spam, to host contraband data such as child pornography,[15] or to engage in distributed denial-of-service attacks as a form of extortion.[16]

Malware is sometimes used broadly against government or corporate websites to gather guarded information,[12] or to disrupt their operation in general. However, malware is often used against individuals to gain information such as personal identification numbers or details, bank or credit card numbers, and passwords. Left unguarded, personal and networked computers can be at considerable risk against these threats. (These are most frequently defended against by various types of firewall, anti-virus software, and network hardware).[13]

Many early infectious programs, including the first Internet Worm, were written as experiments or pranks. Today, malware is used by both black hat hackers and governments, to steal personal, financial, or business information.[10][11]

Malware by categories on 16 March 2011.



  • Purposes 1
  • Proliferation 2
  • Infectious malware: viruses and worms 3
  • Concealment: Viruses, trojan horses, rootkits, and backdoors 4
    • Viruses 4.1
    • Trojan horses 4.2
    • Rootkits 4.3
    • Backdoors 4.4
  • Vulnerability to malware 5
    • Security defects in software 5.1
    • Insecure design or user error 5.2
    • Over-privileged users and over-privileged code 5.3
    • Use of the same operating system 5.4
  • Anti-malware strategies 6
    • Anti-virus and anti-malware software 6.1
      • Known good 6.1.1
    • Website security scans 6.2
    • "Air gap" isolation 6.3
  • Grayware 7
  • History of viruses and worms 8
  • Academic research 9
  • See also 10
  • References 11
  • External links 12


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