On January 24th and 25th, 2004, a number of emails with a fake virus warning from Microsoft were spammed. When users view the email it attempts to download and execute a variant of VBS/Inor trojan dropper from a web site. The real address has been spoofed using a security vulnerability in Internet Explorer.
Once detected, the F-Secure security product will automatically disinfect the suspect file by either deleting it or renaming it.
Detailed instructions for F-Secure security products are available in the documentation found in the Downloads section of our Home - Global site.
You may also refer to the Knowledge Base on the F-Secure Community site for further assistance.
When an user opens the spammed email, an attept to download and execute a VBS/Inor dropper is made. If the dropper is able to execute, then a variant of W32/Dumaru worm is installed into system. Inor drops the worm to "C:\2.exe".
We have received reports that different variants of W32/Dumaru have been dropped from the web site. Further information about W32/Dumaru is available within the following descriptions:
At the time of writing this description, the trojan downloader is removed from the web site.
Below is a screenshot of the message:
Detection in F-Secure Anti-Virus was published on January 26th, 2004 at early morning
Detection Type: PC
Technical Details:Katrin Tocheva and Sami Rautiainen, January 26th, 2004