WhatIs definition: Zero-day vulnerability

Malware, Viruses, Trojans and Spyware

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  • Antigen

    Sybari's Antigen is antivirus software for Lotus Domino and Microsoft Exchange. 

  • pseudonymous profile

    A pseudonymous profile is a collection of information about a particular computer user that identifies the user either by their computer's IP address or by a randomly-generated nickname. 

  • Klez

    Klez (pronounced KLEHZ) is an Internet worm that launches automatically when a user previews or reads an e-mail message containing Klez on a system that has not been patched for a vulnerability in Microsoft Internet Explorer mail clients. 

  • Nimda

    First appearing on September 18, 2001, Nimda is a computer virus that caused traffic slowdowns as it rippled across the Internet, spreading through four different methods, infecting computers containing Microsoft's Web server, Internet Information Se... 

  • exploit

    In computing, an exploit is an attack on a computer system, especially one that takes advantage of a particular vulnerability that the system offers to intruders. 

  • stealth

    In computing, stealth refers to an event, object, or file that evades methodical attempts to find it. 

  • in the wild

    According to noted computer virus expert Paul Ducklin, in order for a virus to be considered in the wild, "it must be spreading as a result of normal day-to-day operations on and between the computers of unsuspecting users. 

  • Chernobyl virus

    The Chernobyl virus is a computer virus with a potentially devastating payload that destroys all computer data when an infected file is executed. 

  • antivirus software

    Antivirus (or "anti-virus") software is a class of program that searches your hard drive and floppy disks for any known or potential viruses. 

  • Bugbear

    Bugbear is a computer virus that spread in early October, 2002, infecting thousands of home and business computers. It is similar to an earlier virus, Klez, in terms of its invasion approach and rapid proliferation.