Experts at SophosLabs?, Sophos's global network of virus, spyware and spam analysis centers, have warned of a Trojan horse that has been spammed out to millions of email addresses around the world.

The spammed out email messages, which have no subject line, typically carry the message text "new price" and an attached file which can have one of several names, including 09_price.zip, price_new.zip, and price2.zip.

The attached ZIP files all contain a malicious file called price.exe, which is the Troj/BagleDl-U Trojan horse. If launched the Trojan horse makes changes to the registry, runs Windows Notepad to act as a decoy, and attempts to turn off anti-virus and security-related software on the infected computer, opening the door for attack by remote hackers. The Trojan horse also tries to download further code from the internet.