WMV (Windows Media Player) trojan in wild
from http://www.pandasoftware.com/about/press/viewNews.aspx?noticia=5818
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Video files appear that download malicious application when they are run
01/10/2005. These files are .wmv files infected by Trj/WmvDownloader.A and
Trj/WmvDownloader.B, two Trojans that take advantage of a new technology
incorporated in Microsoft Windows Media player to install spyware, adware
and dialers, as well as computer viruses
PandaLabs has detected the appearance of two new Trojans,
Trj/WmvDownloader.A and Trj/WmvDownloader.B, which are spreading through
P2P networks in video files. These Trojans take advantage of the new
technology incorporated in Microsoft Windows Media player called Windows
Media Digital Rights Management (DRM), designed to protect the intellectual
property rights of multimedia content. When a user tries to play a
protected Windows media file, this technology demands a valid license. If
the license is not stored on the computer, the application will look for it
on the Internet, so that the user can acquire it directly or buy it. This
new technology is incorporated through the Windows XP Service Pack 2 +
Windows Media Player 10 update.
The video files infected by these Trojans have a .wmv extension and are
protected by licenses, supposedly issued by the companies overpeer (for
Trj/WmvDownloader.A), or protectedmedia (for Trj/WmvDownloader.B). If the
user runs a video file that is infected by one of these Trojans, they
pretend to download the corresponding license from certain web pages.
However, what they actually do is redirect the user to other Internet
addresses from which they download a large number adware (programs that
display advertisements on screen), spyware, dialers (applications that
dial-up high rate toll numbers) and other viruses. Below are some examples
of the malicious programs and viruses these Trojans download:
Adware/Funweb
Adware/MydailyHoroscope
Adware/MyWay
Adware/MyWebSearch
Adware/Nsupdate
Adware/PowerScan
Adware/Twain-Tech
Dialer Generic
Dialer.NO
Spyware.AdClicker
Spyware/BetterInet
Spyware/ISTbar
Trj/Downloader.GK
Even though these Trojans have been detected in video files with extremely
variable names which can be downloaded through P2P networks like KaZaA or
eMule, bear in mind that they can also be distributed through other means,
such as files attached to email messages, FTP or Internet downloads, floppy
disks, CD-ROM, etc. Panda Software has made the corresponding updates to
its anti-malware solutions available to its clients to detect and disinfect
any video file protected by the licenses used by Trj/WmvDownloader.A and
Trj/WmvDownloader.B to carry out their malicious actions. Similarly, the
Panda Software solutions protect users against the malware that these
Trojans try to install on computers.
For further information about Trj/WmvDownloader.A, Trj/WmvDownloader.B or
the malicious programs and viruses these Trojans try to download, visit
Panda Software's Virus Encyclopedia
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marc