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27 Jun 2006

"You had me at hello" : Word attack spammed out as malicious email attachment

Kukudro Trojan horse downloads further malicious code from the internet

The Kukudro Trojan horse arrives as an email attachment
The Kukudro Trojan horse arrives as an email attachment

Updated 28 June 2006 to include latest prevalence statistics.

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 in large quantities to email users around the world.

The WM97/Kukudro-A Trojan horse has been spammed out in email messages, which can have a variety of subject lines including "worth to see", "prices", "Hi", and "Hello", and accounts for over 35% of all malware reported at Sophos's global network of monitoring stations in the last 24 hours.

The body of the message reads as follows:

Hello <name>

Regards, <name> <email address>

Where <name> and <email address> are changing. Attached to the email is a zip file (variously called, or containing a malicious Microsoft Word document entitled my_Notebook.doc.

The Word document contains information about Apple, HP and Sony laptop computers for sale, but secretly attempts to install another Trojan horse, called W32/Kuku-A, onto the user's hard drive.

"People may be curious as to why they have been sent the email and open the attached file, but doing so would be a big mistake," said Graham Cluley, senior technology consultant at Sophos. "This malware is being aggressively spammed out in an attempt to break into innocent users' Windows computers. The Trojan horse will try and download further code from the internet which could allow hackers to gain access to the computer in order to spy, steal and cause havoc."

The Word document secretly installs a Trojan horse onto the PC

The Word document secretly installs a Trojan horse onto the PC.

Sophos has been protecting against the WM97/Kukudro-A and Troj/Kuku-A malware since 14:30 GMT on 27 June 2006.

Sophos recommends that all computer users should ensure that they are running an anti-virus product which is configured to automatically update itself, security patches and firewall software.

Sophos recommends that companies protect their email gateways with a consolidated solution to defend against viruses, spyware and spam, as well as apply an email policy that filters unsolicited executable code at the gateway. Businesses should also secure their desktop and servers with automatically updated protection.

About Sophos

More than 100 million users in 150 countries rely on Sophos as the best protection against complex threats and data loss. Sophos is committed to providing complete security solutions that are simple to deploy, manage, and use and that deliver the industry's lowest total cost of ownership. Sophos offers award-winning encryption, endpoint security, web, email, mobile and network security solutions backed by SophosLabs - a global network of threat intelligence centers.

Sophos is headquartered in Boston, US and Oxford, UK. More information is available at