Finaldo worm on the crawl

By Robert Vamosi
09 November 2001 10:05 AM
Tags: finaldo, worm, virus, mail, internet explorer, infect, file, attach
Finaldo (w32.Finaldo.b@mm) appears to be a flawed version of a more ambitious worm yet to come. Finaldo is a mass-mailer; it spreads by e-mail, using randomly chosen names as attached files, and via shared network directories. Once activated, Finaldo will attempt to infect EXE, OCX, and SCR files as well as ASP, HTM, and HTML files. Fortunately, the current version of the worm contains many bugs and often crashes, though it can also make an infected computer unstable. Because the worm is a mass-mailer but does not yet pose a significant danger, Finaldo ranks as a 4 on the CNET Virus Meter.

How it works
Finaldo can arrive by e-mail. The randomly named attached e-mail file, usually always identified with a Chinese national flag icon, can execute automatically on some versions of Internet Explorer. Users of Internet Explorer 5.0 or 5.01 should update to the latest version of Internet Explorer, or apply the following patch. If a user opens the attached file, Finaldo will look for e-mail clients and send copies of itself to any sender's e-mail address it finds.

Another way for Finaldo to spread is via shared network directories. After infection, the virus part of Finaldo will attempt to infect EXE, OCX, and SCR files on the infected computer and any directories connected to the invaded machine. Finaldo appends itself to the ends of these files, changing their overall file size. For some reason, Finaldo will not infect the files ntoskrnl.exe or WinZip self-extracting archives. On ASP, HTM, and HTML files, Finaldo attempts to append JavaScript code so that these pages, when viewed, can infect other users (like the Nimda worm). Fortunately, this feature does not work at this time.

Finaldo contains the following message in its code:

    Coded_by_CJH
    Finaldoom is coming! Don't worry... It's no harm to your system !
    It's only a demo version
    Made in China

Removal
Most antivirus software companies have updated their signature files to include this worm. For more information on removing this worm from your system, see F-Secure, Kaspersky,McAfee, Sophos, Symantec, and Trend Micro.

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Talkback 1 comments

    From the write up this appears ...Anonymous -- 10/11/01

    From the write up this appears to be an Outlook Worm
    - like so many others. Its clearly a Windows worm
    because it uses EXEs. If this is a Microsoft Windows Outlook Worm - this needs to be said. When I use
    Windows I avoid using Outlook because there are so many worms.

    I agree with those who say "Computer Virus" or "Internet Virus" are misleading terms. "MS Windows Outlook Virus" is a much cleared term.

    -dave

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