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11September.exe
Chet worm misleads in bid to infect
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The day prior to the first anniversary of the September 11 tragedy, a new email worm exploiting the date made its debut. Dubbed W32/Anniv911 by the discoverers and W32/Chet by antivirus vendors, the Chet worm arrives in email with an attachment named '11september.exe '. The filename contains what is known as a trailing space, possibly bypassing some content filtering and antivirus software vulnerable to this exploit.

The worm message has the subject line 'All people!!' and contains the following text:

Dear ladies and gentlemen!
The given letter does not contain viruses, and is not Spam. We ask you to be in earnest to this letter. As you know America and England have begun bombardment of Iraq, cause of its threat for all the world. It isn't the truth. The real reason is in money laundering and also to cover up traces after acts of terrorism September, 11, 2001. Are real proofs of connection between Bush and Al-Qaeda necessary for you? Please! There is a friendly dialogue between Bin Laden and the secretary of a state security of USA in the given photos. In the following photo you'll see, how FBI discusses how to strike over New York to lose people as much as possible. And the document representing the super confidential agreement between CIA and Al-Qaeda is submitted to your attention. All this circus was specially played to powder brains!! You'll find out the truth. Naked truth, instead of TV showed.

For your convenience, and to make letter less, all documentary materials (photos and MS Word documents) are located in one EXE file. Open it, and all materials will be installed on your computer. You will receive the freshest and classified documents automatically from our site. It isn't a virus! You can trust us absolutely. We hope, that it will open your eyes on many things occurring in this world.

Of course, if you believe the claims in the text and open the supposedly 'virus-free' attachment, you will become infected with the W32/Anniv911 a.k.a. Chet worm and it will in turn send itself out from your machine in a bid to mislead and infect even more users.

The worm was first detected by MessageLabs, a managed service provider that specializes in email security, and reported to AVIEN and AVI-EWS, rapid information exchange groups designed to stem the flow of viruses.

Removing the Worm
Search for and delete the following files:

C:\BOOT.TXT
C:\WINDOWS\SYSTEM\SYNCHOST1.EXE

Locate the following Registry Key:

HKEY_CURRENT_USER

and delete the Value: DefaultLcid3="2"

Locate the following Registry Key:

HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\run

and delete the Value: ICQ1="C:\WINDOWS\SYSTEM\synchost1.exe"

Risk Factor
Antivirus vendors began issuing updates to detect the Chet worm hours after it was discovered. Fortunately, due to a bug in the worm's code, it is unlikely to run properly and thus poses little risk of spread. However, attention should be paid to the social engineering aspect of the Chet worm message, as other virus writers might attempt to use similar messages to tempt users into opening their viral files. Email attachments received unexpectedly should be viewed with suspicion. MailDefense effectively and automatically removes potentially harmful attachments and content from email and is a good solution for those who are seeking an additional layer of protection between updates or simply wish to have enhanced protection for their email.

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