Feeds

Peer-to-peer update makes ZeuS botnets harder to take down

Not your father's zombie network

Build a business case: developing custom apps

A new strain of the ZeuS crimeware toolkit comes with a peer-to-peer design that lets infected machines bypass centralized servers when receiving updates and marching orders from operators, a researcher said.

The update to a custom-built ZeuS variant known as Murofet could make it harder for white-hat hackers and law-enforcement agents to disrupt botnets by eliminating centralized command and control servers they infiltrate or shut down, said the the researcher with Zeus Tracker, which monitors botnet communications. The researcher, who asked that his name not be included in this article, recently counted machines from more than 100,000 unique IP addresses infected by the custom build.

Zombies under the control of Murofet come with an initial list of IP addresses to query. They send UDP packets to those destinations over high-numbered ports and wait for fellow bots to respond with additional addresses that are also a part of the p2p network.

If the remote node is running a more recent version of the bot software, it then updates the other machine using a TCP connection. The p2p feature was added around the same time the malware scaled back its reliance on a domain generation algorithm, that allowed bots to connect to custom-registered domain names on specific dates.

The new capability gives the ZeuS offshoot p2p capabilities similar to those that Waledac, TDL-4, and other botnets have boasted for years. With the many other advanced features offered by ZeuS, it's surprising it didn't add it years ago.

The new architecture means Murofet no longer uses a static URL to download binary updates and configuration files, and that's likely to make the job of some researchers harder. But despite the new design, the ZeuS malware remains vulnerable, because it still relies on a central domain and falls back on the domain generation algorithm in the event connections to the main command server and p2p drones is lost.

"Its not impossible to track it, but its more difficult than before," the researcher told The Register over instant messenger. "I would say it makes tracking of ZeuS just more complicated but its not *the new super trojan*." ®

The essential guide to IT transformation

More from The Register

next story
Rupert Murdoch says Google is worse than the NSA
Mr Burns vs. The Chocolate Factory, round three!
e-Borders fiasco: Brits stung for £224m after US IT giant sues UK govt
Defeat to Raytheon branded 'catastrophic result'
Germany 'accidentally' snooped on John Kerry and Hillary Clinton
Dragnet surveillance picks up EVERYTHING, USA, m'kay?
Snowden on NSA's MonsterMind TERROR: It may trigger cyberwar
Plus: Syria's internet going down? That was a US cock-up
Who needs hackers? 'Password1' opens a third of all biz doors
GPU-powered pen test yields more bad news about defences and passwords
Think crypto hides you from spooks on Facebook? THINK AGAIN
Traffic fingerprints reveal all, say boffins
Microsoft cries UNINSTALL in the wake of Blue Screens of Death™
Cache crash causes contained choloric calamity
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.
Top 8 considerations to enable and simplify mobility
In this whitepaper learn how to successfully add mobile capabilities simply and cost effectively.
Solving today's distributed Big Data backup challenges
Enable IT efficiency and allow a firm to access and reuse corporate information for competitive advantage, ultimately changing business outcomes.
Reg Reader Research: SaaS based Email and Office Productivity Tools
Read this Reg reader report which provides advice and guidance for SMBs towards the use of SaaS based email and Office productivity tools.