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How does a virus inject a computer?
Viruses can enter your computer in any number of ways, such as via an email attachment, during file downloads from the Internet or even upon a visit to a contaminated Web site.
Does a virus need to attach itself to a file?
A virus typically attaches itself to a program, file, or the boot sector of the hard drive. Once the virus attaches itself to that file or program (aka, the host), they’re infected. When the infected application or file runs in the computer, the virus activates and executes in the system.
How does a file get a virus?
A computer virus is a program that spreads by first infecting files or the system areas of a computer or network router’s hard drive and then making copies of itself. Some viruses are harmless, others may damage data files, and some may destroy files.
Which virus that runs on the background of a file?
Cavity viruses attempt to get around this by installing themselves in empty space which sometimes exists in programs. This way, the infected file keeps a constant size. Some anti-virus software has a component which runs in the background and constantly scans files on the system.
Can you get a virus by downloading a file?
Malware often will sneak onto a system through a legitimate download, and then infect your system. Think of it like the Trojan Horse of Greek mythology. In fact, that is where the classification of malware Trojan gets its name, by masquerading as a legitimate file, then infecting your system.
Can a virus actually inject their code in other processes?
You can inject your code into other processes with DLL Injection. This does not ensure that the virus will load each time the computer starts up or that the virus will be undetectable / nondetachable. It just means that the virus will be running from the address space of another process (possible PE).
How does a virus spread from one computer to another?
Viruses spread when the software or document they are attached to is transferred from one computer to another using the network, a disk, file sharing, or infected email attachments. Worms. Computer worms are similar to viruses in that they replicate functional copies of themselves and can cause the same type of damage.
What’s the difference between a virus and a virus?
A computer virus attaches itself to a program or file so it can spread from one computer to another, leaving infections as it travels. Much like human viruses, computer viruses can range in severity: Some viruses cause only mildly annoying effects while others can damage your hardware, software or files.
What are the effects of viruses on a computer?
Viruses can range in severity from causing mildly annoying effects to damaging data or software and causing denial-of-service (DoS) conditions. Almost all viruses are attached to an executable file, which means the virus may exist on a system but will not be active or able to spread until a user runs or opens the malicious host file or program.