In some cases (e.g., CodeRed), the best recovery is to reformat the hard disk drive, make a clean installation of the operating system, then install all of the applications software, and finally copy all of the user's data files from backup media.
The anti-virus software vendor Trend Microreported on 17 May 2002 that a total of 9.5 × 105computers worldwide had been infected with either KlezE or KlezH.
This article quotes a public relations consultantwho was falsely accused by eight of her clients,as well as potential clients,for sending the Klez program to them: "I can't imaginethey will trust me with a campaign for a tech firm after this."
At least one version of the Klez program produced e-mail thatsaid that the attachment (which really contained the malicious Klez program)was an "immunity tool" and that the attachment originated froma specific, well-known anti-virus software vendor.
Even if one ignores the rapid growth of a geometric series,the historical examples of the rapid propagation of the in Dec 1987 and the in Nov 1988 showwhat happens when worms are released into computer networks.
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(I put "experiment" in quotation marks, because the design and releaseor a computer virus or worm is a crime, a legitimate scientific experiment.)
Other examples of for writing or releasing malicious programs are contained in my essayon
The first computer virus for Microsoft DOS was apparently written in 1986and contains unencrypted text with the name, address, and telephonenumber of Brain Computer Services, a store in Lahore, Pakistan.
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A variant of the Brain virus was discoveredat the University of Delaware in the USA during Oct 1987 wherethe virus destroyed the ability to read the draftof at least one graduate student's thesis.
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If the doctor were to hand-write every little thing, to keep track of such things, it would be very difficult, but with computers, the task uses less time and the process is simplified....
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The worm displayed an image of a conifer tree on the user's monitor,while it searched two files on the user's account to collect e-mailaddresses, then automatically sent itself to all of those addresses.