klez virus!

klez virus

Comprehensive Analysis

1) "Klez" -- As to klez virus Klez is a computer worm that propagates via E-mail. It first appeared in the end of 2001. A number of variants of the worm exist. Klez infects Microsoft Windows systems, exploiting a vulnerability in Internet Explorer's Trident layout engine, used by both Microsoft Outlook and Outlook Express to render HTML mail. The e-mail through which the worm spreads always includes a text portion and one or more attachments. The text portion consists of either an HTML internal frame tag which causes buggy e-mail clients to automatically execute the worm, or a few lines of text that attempt to induce the recipient to execute the worm by opening the attachment (sometimes by claiming that the attachment is a patch from Microsoft; sometimes by claiming that the attachment is an antidote for the Klez worm). The first attachment is always the worm, whose internals vary. Once the worm is executed, either automatically by the buggy HTML engine or manually by a naive user, it searches for addresses to send itself to. When it sends itself out, it may attach a file from the infected machine, leading to possible privacy breaches. Later variants of the worm would use a false From address, picking an e-mail address at random from the infected machine's Outlook or Outlook Express address book, making it impossible for casual observers to determine which machine is infected, and making it difficult for experts to determine anything more than the infected machine's Internet Service Provider. Notable computer viruses and worms List of computer viruses Computer viruses Anti-virus provider F-Secure Klez information Anti-virus provider Trend Micro Klez information ..." 2) "Virus" -- As to klez virus vi·rus Pronunciation: 'vI-r&s Function: noun Inflected Form(s): plural vi·rus·es Etymology: Latin, venom, poisonous emanation; akin to Greek ios poison, Sanskrit visa; in senses 2 & 4, from New Latin, from Latin 1 archaic : VENOM 1 2 a : the causative agent of an infectious disease b : any of a large group of submicroscopic infective agents that are regarded either as extremely simple microorganisms or as extremely complex molecules, that typically contain a protein coat surrounding an RNA or DNA core of genetic material but no semipermeable membrane, that are capable of growth and multiplication only in living cells, and that cause various important diseases in humans, lower animals, or plants; also : FILTERABLE VIRUS c : a disease or illness caused by a virus 3 : something that poisons the mind or soul <the force of this virus of prejudice -- V. S. Waters> 4 : a computer program that is usually hidden within another seemingly innocuous program and that produces copies of itself and inserts them into other programs and usually performs a malicious action (as destroying data) Pronunciation Symbols This article is about a biological infectious particle; for the computer term, see computer virus. For other uses, see virus (disambiguation). Viruses Virus classification Group: I - VII Groups I: dsDNA viruses II: ssDNA viruses III: dsRNA viruses IV: (+)ssRNA viruses V: (-)ssRNA viruses VI: ssRNA-RT viruses VII: dsDNA-RT viruses A virus is a microscopic particle (ranging in size from 20 - 300 nm) that can infect the cells of a biological organism. Viruses can replicate themselves only by infecting a host cell. They therefore cannot reproduce on their own. At the most basic level, viruses consist of genetic material contained within a protective protein coat called a capsid. They infect a wide variety of organisms: both eukaryotes (animals, yeasts, fungi, and plants) and prokaryotes (bacteria and archaea). A virus that infects bacteria is known as a bacteriophage, often shortened to phage. The word virus comes from the Latin, virus, "poison" (syn. venenum).[1] The study of viruses is known as virology. Those who study viruses are known as virologists. It has been argued extensively whether viruses are living organisms. Most virologis..." 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