WhatIs definition: Zero-day vulnerability

Malware, Viruses, Trojans and Spyware

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  • RAT (remote access Trojan)

    A remote access Trojan (RAT) is a malware program that gives an intruder administrative control over a target computer. RATs are usually downloaded invisibly with a user-requested program -- such as a game -- or sent as an email attachment. Once the ... 

  • hybrid virus/worm

    A hybrid virus/worm is malicious code that combines characteristics of both those types of malware, typically featuring the virus' ability to alter program code with the worm's ability to reside in live memory and to propagate without any action on t... 

  • Kraken

    Kraken is the name given to a family of malware that's currently being used to create what the security firm Damballa has called "the world's largest botnet." Single bots infected with Kraken malware have been recorded sending up to 500,000 spam emai... 

  • Rock Phish

    Rock Phish is both a phishing toolkit and the entity that publishes the kit, either a hacker, or, more likely, a sophisticated group of hackers. While the authors of the kit remain anonymous, Rock Phish has become the most popular phishing kit availa... 

  • Malware: Glossary

    This is a glossary of terms related to malware. 

  • Malicious Computer Code: Glossary

    This is a glossary of terms related to malicious computer code. 

  • back door

    A back door is a means of access to a computer program that bypasses security mechanisms. 

  • directory traversal

    Directory traversal is a form of HTTP exploit in which a hacker uses the software on a Web server to access data in a directory other than the server's root directory... (Continued) 

  • polymorphic malware

    Polymorphic malware is harmful, destructive or intrusive computer software such as a virus, worm, Trojan or spyware that constantly changes ("morphs"), making it difficult to detect with anti-malware programs... (Continued) 

  • bug

    In computer technology, a bug is a coding error in a computer program.