A boot sector virus is a computer virus that infects a storage device's master boot record (MBR). It is not mandatory that a boot sector virus successfully boot the victim's PC to infect it. As a result, even non-bootable media can trigger the spread of boot sector viruses.
Most people consider browser hijacker virus as a form of malware program. Browser hijacker causes an immense problem to the functioning of a computer system by altering the browser settings. Browser hijacker alters the search and error page of a definite browser and redirects the user to its own page.
A macro virus is a computer virus written in the same macro language used for software programs, including Microsoft Excel or word processors such as Microsoft Word. When a macro virus infects a software application, it causes a sequence of actions to begin automatically when the application is opened.
A polymorphic virus is a complicated computer virus that affects data types and functions. It is a self-encrypted virus designed to avoid detection by a scanner. Upon infection, the polymorphic virus duplicates itself by creating usable, albeit slightly modified, copies of itself.
A Trojan horse or Trojan is a type of malware that is often disguised as legitimate software. Trojans can be employed by cyber-thieves and hackers trying to gain access to users' systems. Users are typically tricked by some form of social engineering into loading and executing Trojans on their systems.
A computer virus, much like a flu virus, is designed to spread from host to host and has the ability to replicate itself. Similarly, in the same way that viruses cannot reproduce without a host cell, computer viruses cannot reproduce and spread without programming such as a file or document.
Scripting virus can occur at any point of time because the vulnerability that is required for propagation of the virus is found in maximum websites. This type of virus is able to propagate bit faster than any other virus like Blaster, Code Red and Slammer. Scripting virus can generate web based browser Botnet to enable enormous DDoS attack.