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Opasa Worm - HTML/ZIP based attachment


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#1 harrywaldron

harrywaldron

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Posted 21 April 2004 - 07:42 AM

Symantec gives this an initial "2" rating with great capabilities to spread. Both ZIP and HTML documents are difficult to block corporately, so this one is worth watching.

Opasa Worm - HTML/ZIP based attachments
http://www.symantec.com/avcenter/venc/data/w32.opasa@mm.html

This new worm is highly polymorphic and it's text resembles that of Bagle and Netsky. A possible message body could be:

"hi there! this important html messages cannot be represented as plain text and that's why i have sent it as compressed attachment! "


Attachment: An .html file with a random file name or a .zip archive containing the .html file. If the worm finds the WinZIP program on the infected computer, it will use it to compress the .html file.

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