Antivirus software was developed to combat the viruses mentioned above and help computer users have a technologically sanitary environment. Antivirus software is not just about preventing destruction and denial of service (DoS); it’s also about preventing hacking and data theft. The leading brands of antivirus application brands are Kaspersky, AVG, Bitdefender, Webroot, McAfee, Avira Antivirus, G-Data, Panda, and F-Secure, and so on.
Once installed, the software enables auto-protect application that runs constantly in the background of computer, checking incoming and outgoing files and media such as webpages, CDs, diskettes and emails against the virus definitions incorporated into the software to detect any matches. The key to efficient antivirus application is in the updates of virus definitions. Most antivirus software vendors offer updates as often as once a week. The subscription service to enable the updating of virus definitions is typically only about US$20-30 per year.
Today, antivirus applications predominantly operate by means of identifying unique characteristics or certain patterns in the file code that forms a virus. Once identified, this “signature” is distributed, mainly via the software manufacturer’s Web site, as the most recent virus definition to people who have licensed and installed antivirus software, allowing the software to update its prior definition in order to recognize, eradicate, or quarantine the malicious code. To monitor e-mails and files moving in and out of a computer as well as Web pages user browses, today’s antivirus application typically adopts one or more of the following methods
Scans certain or all files on the computer to detect virus infection. This is the most common scenario that computer users follow to detect and eliminate viruses. Additionally, users can set up schedules to launch automatic virus scanning in the background.
E-Mail and Attachment Scanning:
Scans both the scripts of email content and attachments for malware. For example, Norton can detect viruses by analyzing e-mail before passing it to e-mail server for delivery, despite the cumbrance that this would trigger delay of messaging. Today’s antivirus applications can even screen malware hidden in compressed packages attached to e-mail messages, such as rar and zip files. Many leading email service providers, such as Yahoo and MSN, are integrating the scanning to e-mail messaging so as to promptly warn users of malicious viruses.
Simultaneously scans files that are being downloaded from a network. This enables the application to scan not only the directly downloaded files through browser hyperlinks, but also can screen the files via particular downloader.
Detects virus-like codes/scripts in e-mails and files based on intelligent guessing of typical virus-like code/script patterns and behavior previously analyzed and stored in the application.
Active Code Scanning:
Scans active codes like Java, VB script, and ActiveX in Web pages which can be of malicious and do severe damage to the computers. Links in e-mails can invoke active codes in a Web page and do the same damage.
But, these antivirus softwaares acts as tablets for the fevers caused by viruses for the computers. But,we all know “ Prevention is better than cure”. What can be the preventional measures to act against the virus attacks?
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