List of Various types of Viruses

Computer Virus is harmful program which enter in computer without user's permission or knowledge. It has the ability to replicate itself, thus continuing to spread. Virus affect the program and performance of system.

Today there are various types of Viruses available, let us have a look on few of them.

Memory resident Virus

These Virus fix themselves in computer memory and get activated whenever the OS runs and infects all the files that are then opened. This types of Virus hide in the RAM. It gets control over the system memory and allocate memory blocks through which it runs own code when the function is executed.

Protection- Install an antivirus program.

Direct Action Viruses

The main purpose of this Virus is to replicate and take action when it is excuted. When a specific condition is met, this virus will start to spread infection in Files, Directory or Folder that

are specified in the AUTOEXEC.BAT ( AUTOEXEC.BAT is a system file) file path. The Virus keep changing their location to a new file whenever the code executed, but are generally found in the hard drive's root directory.

Protection- Install an antivirus scanner. However this virus has minimal effect on computer's performance.

Overwrite Virus

This kind of Virus deletes the information contained in the files that it infects, corrupt them partially or totally useless once they have been infected. The virus replace the files content however, it does not change the file size.

Protection- Install the best antivirus program for your computers, If Virus enter in to your computer The only way to clean a file to delete the file completely.

Boot Sector Virus

This type of Virus affect the boot sector of a hard drive. This is crucial part of the disk, in which booting information stored which helps to boot computer system. It hides in the memory until dos accesses the floppy disc or CD/DVD disc, and whichever boot data is accessed Virus infects it.

Protection- The best way of avoiding boot sector Viruses is to ensure that Floppy Discs or CD/DVD Discs are write protected. Also never start your computer with unknown Floppy or CD/DVD.

Macro Virus

Macro Virus infect files that are created certain applications or programs that contain macros, like .doc, .Xls , .pps, .mdb etc. These mini programs make it possible to automate series of operations so that they are performed as a single action thereby saving the user from having to carry them out one by one. These hide in a document that are shared Via e-mail or networks.

Protection- The best technical of protection is t avoid opening e-mails from unknown senders. Also disabling Macros can help you.

Directory Viruses

Directory Viruses infect the directory of your computer by changing the path that indicates the location of file by changing the path that indicates the location of file. When you execute a program file with an extension .EXE or .COM that has been infected by a virus, you are unknowingly running the virus program, while the original file already moved by virus.

Protection- You can reinstall all the files from the backup that are infected after formatting the disk.

Polymorphic Virus

This type of viruses encrypt or encode themselves in a different way every time they infect a system. This makes impossible for antivirus program to identify them using string or signature searches. The virus then goes on to create large number of copies.

Protection- Install a high-end antivirus as the normal ones are incapable of detecting this type of Virus. For purchasing antivirus, Kindly contact Solution For Tech (WWW.SolutionForTech.Com).

FAT Virus

The file allocation table (FAT) is the part of disk used to store all the information about the locations of files, available space, usable space, etc. FAT virus attacks the FAT section and may damage crucial information. Damage caused can result in loss of information from individual files or even entire directories.

Protection- Locate all the files that are actually needed on the hard drive, and then delete the ones that are not needed. They may be files created by virus.

Multipartite Virus-

These viruses spread in multiple ways possible. It may vary in its action depending upon the operating system installed and the presence of certain files. In the initial phase these viruses tried to hide the memory like resident viruses, then they infect the hard drive.

Protection- you need to clean the boot sector and also the disk to get rid of the virus, an the reload all the data in it. 

Web Scripting Viruses

Many web pages includes complex code in order to create an interesting and attractive content. This code is often exploited to bring about undesirable actions. The main source of this virus are the web browsers or infected web pages.

Protection- Install the Microsoft application that is default feature in Windows7 and Windows Vista. Scan the computer with this application.

Worms

A worm is a program very similar to virus, it has the ability to self replicate and can lead to negative effects on to your computer. But they can be detected and eliminated by an antivirus program. These generally spread through e-mails o networks. They do not infect files and damage them, but they replicate so fast that the entire network may collapse.

Protection- Installed an updated version of antivirus program.

Trojans

Another unsavory breed malicious code are Trojan or Trojan horses, which unlike viruses, do not reproduce by infecting other files, nor do they self replicate like worms. In fact it is a program which disguises it self as a useful program or application. This viruses copy files into your computer that can damage your data, and even delete it.

Protection- Installed an antivirus which suggested by qualified technician.

The Most Hateful Computer Viruses of Year 2011- 2012

There were various types of Viruses, which came in Year 2012 but here we discuss most hateful

viruses. It's starting from Stuxnet, Ram nit, Webmoner and several other type of viruses. Below it the brief about all that Viruses.

Stuxnet

This Virus effect is quite real, It create large junk files that continues to Excellently. Due to this Hard drive disk free space it too low and you are getting “Low disk space alert message”. 

 

Ram nit 

This is one of the most dangerous virus that have successfully replaced the role of Sality (One family of viruses called Sality) in year 2011 in the computer and infects excutable files (A file format that the computer can directly execute). In addition Ram nit other Viruses spread in year 2011 that is Webmoner and Font agent. 

 

 

 Webmoner 

Webmoner is a Virus that has similarities with Ram nit its creates 4 files, but instead target the Virus file has the file extension Sys Mso.Sys. That virus Steal a sensitive information and attempts to send gathered information to a remote machine. 

Kolab 
  Facebook chat is quite excited because it has metamorphic abilities. Any malware that spread through FB chat, despite having the same size and name. Various harmful effects can be noticed while Kolab capture your system. Some of the common harmful effects includes:

 * Several pop ups and warning messages.

* Record tracking of internet browsing history.

* Unexpected boot ups etc. 

Note:- Never open a link on facebook chat from unknown person.

  Flame

It spread in year 2012, it's the most powerful computer virus in a history. Flame can spread to other systems over a LAN or via USB stick. It can record audio, screen shots, key board activity and network traffic. The program also record skype conversation and can turned infected computer into a Bluetooth device which attempt to download contact information nearby bluetooth enabled devices. 

 

Belgian Computer Crime Virus

This Virus worked by locking down your computer and falsely claiming to be the police department. Then asked to pay 100 euros or pounds to unlock your data. It claims that your IP address is suspectd of visiting child pornography websites, and will only unlock after payment of a fine. It spread in year 2012. This kind of viruses also known as ransom-ware.

Google redirect Virus

Google redirect Virus is a back door Trojan. It's central function of redirecting you to unrelated websites from Google, that why its name is Google redirect Virus. It have many different secondary functions downloading other malicious programs, creating a back door in your PC security and creating advertisements.

    

Shamoon

It discovered in year 2012 that attacks computer running the Microsoft Windows. Shamoon is capable of spreading to other computers on the network, through shared hard drives.Once a system is infected, the virus continues to compile a list of files from specific locations on the system, erase and then send information about these files attacker. Finally the virus will over write the master boot record of the system to prevent it from booting. 

 

Nine ball/ Gumblar/ DNS Changer

A trojan that can affect personal computers, network devices and computers on a network. It used to redirect users to fake websites in attempt to generate fraud as revenue, sell fake services or to steal personal financial information. That kind of virus found in year 2012.

 Alureon/TDL/TDSS

This was used as a major part of DNS changer infection. Alureon is a rootkit type trojan virus. It attempts to gain administrative access to victim's computer system so that it may disable security features and further infect the system.

Zeus and Spy Eye

This is the most prevalent banking fraud virus and malware. It usually installs when user clicks on emailed phishing scam email that then direct them to website infected with an exploit kit. So never enter your Bank info in mail which you receive from unknown Person , before doing so kindly confirm with your bank.

 Blackhole

This is in the family of malware and computer viruses known as exploit kits. As the name implies this virus will scan and probe the victim computer for security holes in applications, software, browsers and add-ons. Once the security successfully breached and a hole is created it will proceed with rootkit to take over the machine.

Fake AV

One of the viruses are quite famous since 2 year ago also didn't want to lose this year. It's a virus that uses fake security application methods to trick computer users with notifications and messages that the computer has been infected with virus and asking computer users to activate the fake antivirus is a way to pay online.

Slugin

It is a file infector that inserts part of its virus code at the entry point of the file. It also copies the rest of its code and the original entry point code to the end of file. It infects .EXE and .DLL files. 

                                                           Latest Viruses

Disk Antivirus Professional

Disk Antivirus Professional is a dangerous new rogue antivirus program, which is used to get money from you. You can get it from pretty much everywhere, including spam e-mail attachments, p2p connections and malicious links in various websites. Once you get it, it will reedit your registry and make sure it starts together with your computer. From then on, it will proceed to hide from your antivirus and appear as a legitimate program. It will constantly flood you with fake warnings of threats, which are supposed to scare you. In order to clear them, you will be asked to buy its official version, although this is a complete lie. For this reason, you should find and remove this threat immediately.


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