New Bagle, MyDoom variants roil Internet

New versions of the Bagle and MyDoom worms surfaced on the Internet Monday, and appear to be spreading.

Bagle.AI and MyDoom.N are both so-called "mass mailing" worms that use a built-in SMTP (Simple Mail Transfer Protocol) engine that sends e-mail messages carrying worm-infected file attachments from computer to computer on the Internet, both using faked (or "spoofed") sender addresses, antivirus companies said.

The new worm variants are just the latest in a string of virus releases in recent days that have antivirus software companies scrambling to keep their customers protected.

W32.Bagle.AI first appeared Monday and is rated a "medium" threat by McAfee's Antivirus Research Team, citing reports of the virus from customers. McAfee rated MyDoom.N a "low" threat, whereas Computer Associates International noted the prevalence and destructiveness of the worm.

Similar to earlier versions of Bagle, the AI variant spreads through shared file folders and in e-mail messages carrying the worm file as an attachment, according to advisories from Sophos and McAfee.

E-mail messages generated by the worm used forged (or "spoofed") sender addresses and the subject line "Re:" Worm-infected file attachments might be in ZIP, EXE, SCR, COM or CPL and also have nonspecific names like "Moreinfo," "Details" or "Readme," antivirus companies said.

Infected file attachments use one of a short list of names including "MP3," "Doll" and "Cat."

The worm can also send copies of itself as a password-protected compressed file with a ZIP extension. The password needed to unzip the ZIP file is contained in a second file with a TXT, INI, DOC or other extensions, McAfee said.

The MyDoom.N worm uses spoofed sender addresses such as "postmaster," "Post Office" and "MAILER-DAEMON" that make the e-mail resemble a rejected message.

MyDoom.N messages also have nondescript Subject lines such as "hello," "hi" and "delivery failed." Virus file attachments have names like "readme," "mail," "text" and "attachment." File extensions include CMD, BAT, COM, EXE and ZIP, McAfee said.

Antivirus companies issued updated virus definitions that can detect the new Bagle and MyDoom variants and recommended that customers update their antivirus software.

Join the newsletter!


Sign up to gain exclusive access to email subscriptions, event invitations, competitions, giveaways, and much more.

Membership is free, and your security and privacy remain protected. View our privacy policy before signing up.

Error: Please check your email address.
Keep up with the latest tech news, reviews and previews by subscribing to the Good Gear Guide newsletter.

Paul Roberts

IDG News Service
Show Comments

Cool Tech

Toys for Boys

Family Friendly

Stocking Stuffer

SmartLens - Clip on Phone Camera Lens Set of 3

Learn more >

Christmas Gift Guide

Click for more ›

Brand Post

Most Popular Reviews

Latest Articles


PCW Evaluation Team

Aysha Strobbe

Microsoft Office 365/HP Spectre x360

Microsoft Office continues to make a student’s life that little bit easier by offering reliable, easy to use, time-saving functionality, while continuing to develop new features that further enhance what is already a formidable collection of applications

Michael Hargreaves

Microsoft Office 365/Dell XPS 15 2-in-1

I’d recommend a Dell XPS 15 2-in-1 and the new Windows 10 to anyone who needs to get serious work done (before you kick back on your couch with your favourite Netflix show.)

Maryellen Rose George

Brother PT-P750W

It’s useful for office tasks as well as pragmatic labelling of equipment and storage – just don’t get too excited and label everything in sight!

Cathy Giles

Brother MFC-L8900CDW

The Brother MFC-L8900CDW is an absolute stand out. I struggle to fault it.

Luke Hill


I need power and lots of it. As a Front End Web developer anything less just won’t cut it which is why the MSI GT75 is an outstanding laptop for me. It’s a sleek and futuristic looking, high quality, beast that has a touch of sci-fi flare about it.

Emily Tyson

MSI GE63 Raider

If you’re looking to invest in your next work horse laptop for work or home use, you can’t go wrong with the MSI GE63.

Featured Content

Product Launch Showcase

Don’t have an account? Sign up here

Don't have an account? Sign up now

Forgot password?