A new variant of the Dumaru worm family has been found in the wild on 25th of January, 2004.
This variant of the worm is really similar to the Y variant with the following differences:
Dumaru.Z can be removed manually by performing the following steps:
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See the manual for your F-Secure product on the Help Center.
Submit a file or URL for further analysis.
Upon execution Dumaru.Z installs several copies of itself to the computer:
[Boot] Shell=explorer vxd32v.exe
Dumaru.Z uses its own SMTP engine to send emails. The SMTP engine performs a direct name service lookup on the target domain so it does not depend on the infected computer's email server settings.
To collect email addresses the worm recursively searches through all the directories on the computer and looks for files that could contain email addresses:
'.htm' '.wab' '.html '.dbx' '.tbb' '.abd'
Going through the list of collected addresses Dumaru.Z sends emails with infected attachments that have to following characteristics:
From: "Elene" [F*CKENSUICIDE@HOTMAIL.COM] To: [firstname.lastname@example.org] Subject: Important information for you. Read it immediately ! Body: Here is my photo, that you asked for yesterday. Attachment: myphoto.zip
Dumaru.Z - just like it's earlier variants - comes with capabilities to steal sensitive user data:
The collected data is sent to a predefined email address.
Dumaru.Z has a function that downloads a trojan from a predefined location and places it to 'nvidia32.exe' to the Windows Directory.
The downloaded file is then executed to activate the trojan.