antivirus software

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antivirus software

[¦an·tē‚vī·rəs ′sȯf‚wer]
(computer science)
Software that is designed to protect against computer viruses.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.

antivirus software

Programs to detect and remove computer viruses. The simplest kind scans executable files and boot blocks for a list of known viruses. Others are constantly active, attempting to detect the actions of general classes of viruses. antivirus software should always include a regular update service allowing it to keep up with the latest viruses as they are released.
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antivirus program

Software that searches for viruses. Also known as a "virus scanner." As new viruses are discovered by the antivirus vendor, their binary patterns and behaviors are added to a database that is downloaded periodically to the user's antivirus program via the Web. Popular antivirus programs are Norton, McAfee, Sophos, Bitdefender, AVG and Kaspersky. Microsoft Defender is Microsoft's own antivirus software that comes with Windows, starting with Windows 8.

Antivirus programs are used on all Windows machines, but most Mac users do not install them. However, as more Macs are acquired, the Mac has slowly but surely become a target of attacks, and Mac antivirus programs are being installed at a more rapid rate than in the past. See virus, quarantine, disinfect and scareware.

Multiple Detection Approaches
Early antivirus scanning matched the binary signature (pattern) of executable files against a database of known malware signatures before they were allowed to run. This "scanning" process was vastly speeded up by doing a one-time scan of all the executables in the computer and also when a new one is installed. If the executable is virus free, a checksum (hash) of its binary pattern is computed and stored in a checksum database. The next time the executable is launched by the user, its checksum is recomputed and compared with the virus-free checksum. If they match, the file was not adulterated.

Because malware may generate a unique signature each time it is downloaded to an unsuspecting user, antivirus programs also use behavior detection, which looks for suspicious activities such as copying and deleting files when launched (see behavior detection). See Symantec, McAfee, Sophos, Bitdefender, AVG, checksum, virus, polymorphic virus and Reputation-based Security.

Scan and Create a Checksum (Hash)
This is commonly used to speed up antivirus scanning, because computing and comparing an executable's checksum is considerably faster than analyzing the file each time it is loaded.
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References in periodicals archive ?
If found, it will also exempt virus scan on the page and merge them asynchronously.
With the embedded virus scan engines from McAfee and Sophos, and the now achieved certification on SAP NetWeaver 7.40, the HANA-optimized release of the SAP Web application server, content-scans and virus-scans are performed entirely “in-memory,” and do not introduce a bottleneck to the overall performance of the SAP application, regardless of the underlying database.
Microsoft and security experts advise users not to open unsolicited email, to run a full virus scan and make sure their virus protection is up to date and turned on.
McAfee Virus Scan 2006 is a fully automated antivirus protection solution that provides secure protection against existing and emerging viruses, email viruses, worms and spyware programs and blocks access to user data and private information.
In addition to the central virus filter for outgoing e-mails, Telenor had also introduced "virus radar" in 2004, as part of the company's central Virus Scan service.
In addition to having a built-in spare filter and virus scan, the new Gmail service will be flee of the annoying pop-up and banner ads that permeate the Internet.
Perform a virus scan on any new programs or other files that could contain executable code before you run or open them, no matter where they originate.