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Watch out for tainted WMA files

Friday, 14 January 2005
by Geoff Nicholson

If you are in the habit of downloading Windows Media files via peer-to-peer networks, you may end up with more than you bargained for.

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...Continued Watch out for tainted WMA files

PC World downloaded some Windows Media files, ran them and experienced pop-ups as well as attempts to install adware and hijack the web browser's homepage.

The tainted files work rather simply. If you download a protected Windows Media file but don't have a valid license on your box, Windows Media Player accesses the remote system that runs a Windows Media DRM Server. Normally, this process happens in the background. However, sometimes a dialog box labeled 'License Acquisition' pops up. The dialog box is usually used legitimitely for confirming data or asking you to join a mailing list. However, the tainted WM files' dialog box feature advertisements which, in turn, force additional pop-ups.

The tainted Windows Media files are not widespread, claim PC World. The easiest way to avoid the problem is to avoid playing Windows Media files, although this is not always an easy thing to do. Other tips include:

  • Using a firewall that allows you to actively block incoming and outgoing traffic.
  • Keeping your operating system as secure as possible by installing necessary patches.
  • Block pop-ups. This will not stop the inital pop-up but will prevent it from spawning a family of resource-hoggers.
  • Make sure to set your browser to let you know before downloading any ActiveX controls (in IE, choose Tools, Internet options, Security and click 'Custom Level').
  • Configure Windows Media Player to warn you each time a WM file attempts to obtain a license. Do this via Tool, Options, Privacy and turn off 'Acquire licenses automatically for protected content'. If the site that possesses the license looks dodgy, you can prevent it from bothering you.

Also:
Risk Your PC's Health for a Song?
To Evil! Jan '05 Edition
Firm gives P2P networks adware infection
Digital Media Losers - 2004  
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