![]() For example, the Whale virus adds 9216 bytes to an infected file then the virus subtracts the same number of bytes (9216) from the size given in the directory. They either redirect the disk head to read another sector instead of the one in which they reside or they may alter the reading of the infected file’s size shown in the directory listing. Stealth viruses: These types of viruses use different kind of techniques to avoid detection. ![]() These viruses are more difficult to detect. Polymorphic viruses: A virus that can encrypt its code in different ways so that it appears differently in each infection. When you boot the computer next time the virus from the boot record loads in memory and then start infecting other program files on disk They infect program files and when the infected program is executed, these viruses infect the boot record. Multipartite virus: A hybrid of Boot and Program/file viruses. Cleaning this type of virus is very difficult. Worms are similar to the Virus, but a worm doesn’t need a host program to execute itself, worms are the standalone program. As soon as the computer starts it gets infected from the boot sector. You can always make your PC safe using a good antivirus program with latest update and virus definition, always avoid suspicious files from email and rouge websites. These are also memory resident in nature. The easiest way to remove a MBR virus is to clean the MBR area,īoot sector virus: Boot sector virus infects the boot sector of a HDD or FDD. A MBR virus will infect this particular area of Storage device instead of normal files. Master boot record files: MBR viruses are memory-resident viruses and copy itself to the first sector of a storage device which is used for partition tables or OS loading programs. Once infected repairing of these files is very much difficult. Macro Virus: These type of virus infects word, excel, PowerPoint, access and other data files. It is important to note that a virus cannot be spread without a human action, such as running an infected program to keep it going. Almost all viruses are attached to an executable file, which means the virus may exist on your computer but it actually cannot infect your computer unless you run or open the malicious program. So before you download anything from the internet, be sure about it first. ![]() They can be hidden in a free/trial softwares or other files that you download. Viruses also enters through downloads on the Internet. ![]() Viruses can enter to your computer as an attachment of images, greeting, or audio / video files. A computer Virus is more dangerous than a computer worm as it makes changes or deletes your files while worms only replicates itself with out making changes to your files/data. A virus might corrupt or delete data on your computer. Virus is a program written to enter to your computer and damage/alter your files/data. So wherever a malware term is used it means a program which is designed to damage your computer it may be a virus, worm or Trojan. Malware is designed to cause damage to a stand-alone computer or a networked pc. "Malware" is short for malicious software and used as a single term to refer to virus, spy ware, worm etc. ![]()
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