Feeds

Final countdown to Conficker 'activation' begins

T-minus six

High performance access to file storage

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.

High performance access to file storage

More from The Register

next story
Obama allows NSA to exploit 0-days: report
If the spooks say they need it, they get it
Parent gabfest Mumsnet hit by SSL bug: My heart bleeds, grins hacker
Natter-board tells middle-class Britain to purée its passwords
Web data BLEEDOUT: Users to feel the pain as Heartbleed bug revealed
Vendors and ISPs have work to do updating firmware - if it's possible to fix this
OpenSSL Heartbleed: Bloody nose for open-source bleeding hearts
Bloke behind the cockup says not enough people are helping crucial crypto project
One year on: diplomatic fail as Chinese APT gangs get back to work
Mandiant says past 12 months shows Beijing won't call off its hackers
Call of Duty 'fragged using OpenSSL's Heartbleed exploit'
So it begins ... or maybe not, says one analyst
German space centre endures cyber attack
Chinese code retrieved but NSA hack not ruled out
Experian subsidiary faces MEGA-PROBE for 'selling consumer data to fraudster'
US attorneys general roll up sleeves, snap on gloves
prev story

Whitepapers

Securing web applications made simple and scalable
In this whitepaper learn how automated security testing can provide a simple and scalable way to protect your web applications.
Five 3D headsets to be won!
We were so impressed by the Durovis Dive headset we’ve asked the company to give some away to Reg readers.
HP ArcSight ESM solution helps Finansbank
Based on their experience using HP ArcSight Enterprise Security Manager for IT security operations, Finansbank moved to HP ArcSight ESM for fraud management.
The benefits of software based PBX
Why you should break free from your proprietary PBX and how to leverage your existing server hardware.
Mobile application security study
Download this report to see the alarming realities regarding the sheer number of applications vulnerable to attack, as well as the most common and easily addressable vulnerability errors.