Feeds

Final countdown to Conficker 'activation' begins

T-minus six

5 things you didn’t know about cloud backup

Security watchers are counting down to a change in how the infamous Conficker (Downadup) worm updates malicious code, due to kick in on Wednesday 1 April.

Starting on 1 April, Windows PCs infected by the latest variant of the Conficker worm (Conficker-C) will start attempting to contact a sample of 50,000 pre-programmed potential call-home web servers from which they might receive updates, a massive increase on the 250 potential web server locales used by earlier variants of the code.

"Conficker-C isn't going to contact all 50,000 domains per day," explained Niall Fitzgibbon, a malware analyst at Sophos. "It's only going to contact a randomly-chosen 500 of them which gives each infected machine a very small chance of success if the authors register only one domain. However, the P2P system of Conficker can be used to push digitally signed updates out to other infected machines that don't manage to contact the domain."

Known unknown

Whether anything will actually be offered for download, much less what the payload might be, is unclear. No particular function or payload currently within the malicious code is due to activate on 1 April. It's also possible that a payload will only be offered up for download days or week after the new call-home routine comes into effect.

If updates are successfully made, infected machines are programmed to suspend call-home activity for 72 hours, as an analysis by Sophos explains.

Lessons from the call back routines of previous variants of the worm provide few clues as to what might happen. Sophos said it never observed the previous Conficker-B variant ever downloading malicious payloads, other than updates to Conficker-B++ and Conficker-C. As a result, there isn't much history to draw upon for any speculation as to the eventual goal of the Conficker botnet.

Anti-virus firms are keeping a close eye on what Conficker might do early next month while downplaying concerns that Downadup will either "erupt" or "explode" on 1 April, deluging us with spam or swamping websites with junk traffic in the process.

"Let's not forget that history has shown us that focusing on a specific date for an impending malware attack has sometimes lead to nothing more than a damp squib," notes Graham Cluley, senior technology consultant, at Sophos.

Although nothing might happen it's never a bad time for sys admins to check for infection by Conficker on their network. Such infections have already caused widespread problems.

Symantec said that the worm, which had initially focused solely on spreading "has since developed into a robust botnet, complete with sophisticated code signing to protect update mechanisms, as well as a resilient peer-to-peer protocol". An analysis of the worm, complete with a graphic illustrating the evolution of the worm's propagation, control and defensive features, can be found here.

Windows PCs infected with Conficker (Downadup) are programmed to dial home for updates through a list of pseudo-random domains. Microsoft is heading a group, dubbed the anti-cabal alliance, to block unregistered domains on this list. The more complex call-home routine deployed by Conficker-C comes in apparent response to this move.

Rik Ferguson, a security researcher at Trend Micro, added that blocking call-back domains associated with the latest variant of the worm will be "almost impossible" not only because of the daily volume, but also because there is a possibility that legitimate domains might be hit as a result. Even earlier versions of the worm, calling far fewer domains every day, used algorithms that threw up addresses that coincided with legitimate domains.

Secure remote control for conventional and virtual desktops

More from The Register

next story
Ice cream headache as black hat hacks sack Dairy Queen
I scream, you scream, we all scream 'DATA BREACH'!
Goog says patch⁵⁰ your Chrome
64-bit browser loads cat vids FIFTEEN PERCENT faster!
NIST to sysadmins: clean up your SSH mess
Too many keys, too badly managed
Scratched PC-dispatch patch patched, hatched in batch rematch
Windows security update fixed after triggering blue screens (and screams) of death
Researchers camouflage haxxor traps with fake application traffic
Honeypots sweetened to resemble actual workloads, complete with 'secure' logins
Attack flogged through shiny-clicky social media buttons
66,000 users popped by malicious Flash fudging add-on
JLaw, Kate Upton exposed in celeb nude pics hack
100 women victimised as Apple iCloud accounts reportedly popped
New Snowden leak: How NSA shared 850-billion-plus metadata records
'Federated search' spaffed info all over Five Eyes chums
Three quarters of South Korea popped in online gaming raids
Records used to plunder game items, sold off to low lifes
Oz fed police in PDF redaction SNAFU
Give us your metadata, we'll publish your data
prev story

Whitepapers

Endpoint data privacy in the cloud is easier than you think
Innovations in encryption and storage resolve issues of data privacy and key requirements for companies to look for in a solution.
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.
Advanced data protection for your virtualized environments
Find a natural fit for optimizing protection for the often resource-constrained data protection process found in virtual environments.
Boost IT visibility and business value
How building a great service catalog relieves pressure points and demonstrates the value of IT service management.
Next gen security for virtualised datacentres
Legacy security solutions are inefficient due to the architectural differences between physical and virtual environments.