Feeds

Worms pour through MyDoom back door

More of the same

  • alert
  • submit to reddit

Securing Web Applications Made Simple and Scalable

Updated Virus writers are exploiting machines infected by MyDoom-A to launch a denial of service attacks on Microsoft with the release of yet another Net worm.

The Doomjuice worm, discovered yesterday, uses the back door installed by Mydoom-A to spread. Doomjuice does not propagate using email.

Doomjuice (AKA MyDoom-C) scans random IP addresses to locate machines with the MyDoom-A backdoor (TCP port 3127) open. Using this technique it infects vulnerable machines that then becomes doubly infected.

Zombie machines infected by MyDoom-C become part of a DDoS attack against Microsoft.com - explained in greater depth here. Doomjuice - unlike MyDoom-A - is not programmed to attack www.sco.com.

A second worm, Deadhat, removes the MyDoom virus from its victims, installing itself instead. This worm spreads through the back door opened by MyDoom-A and MyDoom-B as well as through a P2P application called SoulSeek.

Worms infected by Deadhat are - like those infected by MyDoom-A - still under the control of crackers. More info on Deadhat (AKA Vesser) can be found here.

Neither Deadhat nor Doomjuice are spreading particularly quickly. AV vendors rate both as relatively low-risk. MyDoom-A, due to deactivate on Thursday, remains the real menace.

As usual, all these worms are Windows-only - Linux, Mac, OS/2 and Unix users are immune.

Windows users meanwhile are left to shelter under the projection of AV scanner software until the current MyDoom squall dies down. Even security conscious PC users or Mac users are not wholly immune though, thanks to the blizzard of bounced and redirected messages generated as a result of MyDoom's spoofing behaviour. ®

Update

The Doomjuice worm also plants a copy of the source code for MyDoom-A onto infected computers, according to AV vendor Sophos. The company reckons this is either an attempt to encourage others to write copy-cat viruses or in an attempt to make it more difficult to catch the true author of the worm, if that person is ever apprehended.

Related Stories

Latest Email worm (MyDoom) has SCO-facing payload
SCO posts $250,000 worm bounty
MyDoom assault forces SCO.com off the net
MyDoom variant attacks Microsoft.com

The smart choice: opportunity from uncertainty

More from The Register

next story
Mozilla fixes CRITICAL security holes in Firefox, urges v31 upgrade
Misc memory hazards 'could be exploited' - and guess what, one's a Javascript vuln
Manic malware Mayhem spreads through Linux, FreeBSD web servers
And how Google could cripple infection rate in a second
How long is too long to wait for a security fix?
Synology finally patches OpenSSL bugs in Trevor's NAS
Don't look, Snowden: Security biz chases Tails with zero-day flaws alert
Exodus vows not to sell secrets of whistleblower's favorite OS
Roll out the welcome mat to hackers and crackers
Security chap pens guide to bug bounty programs that won't fail like Yahoo!'s
HIDDEN packet sniffer spy tech in MILLIONS of iPhones, iPads – expert
Don't panic though – Apple's backdoor is not wide open to all, guru tells us
Researcher sat on critical IE bugs for THREE YEARS
VUPEN waited for Pwn2Own cash while IE's sandbox leaked
prev story

Whitepapers

Top three mobile application threats
Prevent sensitive data leakage over insecure channels or stolen mobile devices.
Implementing global e-invoicing with guaranteed legal certainty
Explaining the role local tax compliance plays in successful supply chain management and e-business and how leading global brands are addressing this.
Boost IT visibility and business value
How building a great service catalog relieves pressure points and demonstrates the value of IT service management.
Designing a Defense for Mobile Applications
Learn about the various considerations for defending mobile applications - from the application architecture itself to the myriad testing technologies.
Build a business case: developing custom apps
Learn how to maximize the value of custom applications by accelerating and simplifying their development.