Viruses can also reside on portions of the hard disk or floppy disk that load and run the operating system when the computer is started, and such viruses thereby are run automatically. In computer networks, some viruses hide in the software that allows the user to log on (gain access to) Types of VIRUS There are five categories of viruses: parasitic or file viruses, bootstrap sector, multi-partite, macro, and script viruses. Parasitic or file viruses infect executable files or programs in the computer. These files are often identified by the extension .exe in the name of the computer file. File viruses leave the contents of the host program unchanged but attach to the host in such a way that the virus code is run first.
The computer virus infection is small software that can harm your computer; it disrupts computer function, and corrupts and wipes out data. The spread of a virus can occur in numerous ways. Ways that a virus can spread is through the opening of attachments to emails or other kind of messages, through downloading files from the internet, through visiting unknown websites and through installing un-trusted program files. One unique characteristic about a computer virus that differentiates from other malware is that a computer virus can only spread through human action. The computer virus can be on your computer without you knowing and the computer virus is only effective when you click on the infected program.
This virus targets COM and EXE files, but have also been found in other executable files. some viruses are memory resident which will infect every file run after that one. Other are “direct action” injectors that immediately infect other files on your hard drive then leave. Another way viruses infect your system is if they are polymorphic. Polymorphism is where the virus changes itself with every infection so it is harder to find.
Though Viruses, Worms, and Trojan Horses are different, they are all classified under one category: malware software. It’s designed to cause significant damage by deleting, hacking, or stealing important files. Though malware doesn’t often damage any physical hardware, it can create great damage to the software that a PC contains. A computer virus is malicious software that attaches itself to various programs or data. It’s capable of spreading from one computer to another, leaving traces of its infection as it moves.
It is critical to understand how viruses work to be better protected against them. Similar to its biological namesake, a virus is a small program designed to harm a computer. A virus is a type of malware program. This means it is a software program used to disrupt computer operations, gather sensitive information, or gain access to private computer systems (Microsoft). Viruses can generally spread by themselves.
It scans all files on the hard disk,diskettes, CD ROM, and memory to locate viruses. ("Computer," 1997) The life cycle of a virus is rather complicated; it begins when a user runsan infected program. The computer copies the program from the disk into RAM,random access memory, where it can be performed. The viral code begins torun, and the virus copies itself into a part of RAM that is separate from theprogram. This allows the pesky virus to continue to spread while anotherprogram is running, until it is finished and passes back into the infectedprogram.
A computer virus is a relatively small program that attaches itself to data and program files before it delivers its malicious act. There are many distinct types of viruses and each one has a unique characteristic. Viruses are broken up into to main classes, file infectors and system or boot-record infectors. A file infector attaches to ordinary programs usually affecting .COM and .EXE files. These two files are subject to infection though some can infect any program from which execution is requested.
This site could also work the other way around where you can search up a virus and look at its symptoms. This site will help with precautions that can and should be taken to prevent from getting viruses as well as spreading them. Research Overview: Computer viruses can delete files, cause lagging, cross-link files, change memory size, destroy hard drive systems, and freeze devices. The most common computer virus is the “ Trojan Virus”, the Trojan virus is a virus sent to infect your device stealing personal data damaging your system hard drive. With each computer virus come different symptoms.
Three types of viruses are a boot sector virus, file virus, and Trojan horse virus. A boot sector virus infects the. When the infected boot program executes, the virus is loaded into the computer’s memory. Once the Virus is in memory, it can spread to any floppy disk inserted into the computer. A file virus inserts virus codes into program files… The virus then spreads to any program that accesses the infected file.
It’s almost like these virus writers make it a puzzle to solve before you can actually disband the virus itself. Even when the code is cracked and disassembled, writers normally just rewrite that code to do the exact same thing again. To stay safe from many different forms of viruses, the best way to go is to download a couple different kinds of anti-virus programs. Harley says it is almost impossible to get through three different anti-virus programs. He also says that it is easily solved when it comes to Trojans, worms, viruses, and malware.