computer virus definition
VIRUS: Virtual Information Resource Under Siege
Computer virus means that a deadly disease will stay dormant on your laptop, while not showing major signs or symptoms. However, once the virus infects your laptop, the virus will infect different computers on an equivalent network. Stealing passwords or knowledge, work keystrokes, corrupting files, spamming your email contacts, and even taking up your machine area unit just a few of the devastating and aggravating things a deadly disease will do.
types of computer virus:
2.Boot sector virus:
A boot sector virus is malware that infects the pc storage sector wherever startup files area unit found. The boot sector contains all the files needed to begin the OS (OS) and different bootable programs. The viruses run at boot up, permitting them to execute malicious code throughout startup time — before several security layers area unit dead, as well as antivirus software package.
3.Web Scripting Virus:
A web scripting virus may be a sort pc security vulnerability through websites that breaches your applications programe security. This allows the attackers to inject client-side scripting into the online page. It will bypass access controls, steal your info from your applications program. internet scripting viruses square measure typically wont to attack sites with giant populations like social networking, user review, and email. internet scripting viruses square measure ready to propagate a touch quicker than alternative viruses. a typical version of internet scripting viruses square measure DDoS. it’s to the potential to send spam, harm knowledge and bunco users.
Polymorphism, in computing terms, means one definition is used with variable amounts of knowledge. so as for scanners to sight this sort of virus, brute-force programs should be written to combat and sight the polymorphic virus with novel variant configurations.
5.Direct Action Virus:
6.Browser hijacker virus:
A browser hijacker could be a malware program that modifies applications programme settings while not the user’s permission and redirects the user to websites the user had not meant to go to. usually known as a browser send virus as a result of it redirects the browser to different, typically malicious, websites, a browser hijacker allows browser hijacking.
7.File Infector virus:
computer program that inserts its malicious code into feasible files on a system. once the infected file is opened or used the virus could write the file and cause permanent injury to the content of the overwritten file. this kind of virus targets an outsized vary of in operation systems, together with Macintosh, UNIX, DOS, and Windows.
A many-sided virus may be a fast-moving virus that uses file infectors or boot infectors to attack the boot sector and feasible files at the same time. Most viruses either have an effect on the boot sector, the system or the program files. The many-sided virus will have an effect on each the boot sector and also the program files at constant time, therefore inflicting additional injury than the other quite virus. once the boot sector is infected, merely turning on the pc can trigger a boot sector virus as a result of it latches on to the Winchester drive that contains the information that’s required to begin the pc. Once the virus has been triggered, harmful payloads area unit launched throughout the program files.
Macro viruses will be engineered into subtle applications like those gift in word processors so as to run programs in order that they’ll be launched mechanically. The language is constructed into the macros so as to hijack the commands, together with necessary actions like a gap up a document. Thus, through the easy act of gap a document, a macro virus will be launched. Macro viruses are also unfolding through email attachments, modems and on the net, networks, and disks