Feeds

Feds declare victory over notorious Coreflood botnet

Unprecedented take-down gets results

Using blade systems to cut costs and sharpen efficiencies

Federal authorities say they have crippled a notorious botnet that penetrated some of the world's most sensitive organizations, thanks to an unprecedented take-down strategy that used a government-run server that communicated directly with infected PCs.

Coreflood, as the network of compromised computers is known, enslaved almost 800,000 machines when the FBI commenced the operation in April. By the second week of June, the number was so small it was barely discernible on a chart the agency submitted in a recent affidavit. In all, computers reporting to the botnet's command and control channel fell by more than 95 percent, an FBI special agent wrote in a court filing.

Chart of Coreflood infected computers

"Operation Adeona," as the take-down effort was called, adopted a novel approach that could become a model for future actions. Most notably, it used a substitute command server that issued “stop” commands to the zombie machines which disabled the Coreflood malware until the next reboot. The operation also called for the government to work with internet service providers to identify the owners of infected machines so authorities could then get permission to permanently zap the malware.

It was the first time US government authorities had ever issued commands to a compromised PC they didn't operate. The action was designed to prevent Coreflood operators from setting up new servers that would resurrect the botnet in the weeks or months following the effort.

Only 24 identifiable victims agreed to let the FBI issue the uninstall command, but the consent still resulted in the instruction being sent to 19,000 computers, Special Agent Kenneth Keller wrote in a declaration filed in federal court last week. None of the machines suffered adverse consequences.

The operation was also novel in the way government authorities worked with ISPs and antivirus providers to identify and disinfect compromised end users. By the end of May, more than 20 of the major AV products detected the latest versions of the Coreflood malware. Combined with the suspension of any new variations that could evade detection, that gave users time to permanently rid their machines of the infections.

As a result, Keller said the FBI wanted to shut down the server used to communicate with infected machines, so the government could direct the considerable cost of running and monitoring it to other endeavors.

"While the Coreflood software will begin to run on still-infected computers once the substitute server is taken out of operation, the seizure of the Coreflood domains will continue reasonably to prevent the defendants from obtaining access to those computers or to data stolen from those computers," he wrote.

Coreflood had infected more than two-million Windows machines since 2002. During and 11-month period starting in March 2009, Coreflood siphoned some 190GB worth of banking passwords and other sensitive data from more than 413,000 infected users as they browsed the net, authorities have said.

The explosive growth in computer-based crime over the past years often leaves the good guys with the sense they're raking leaves on a windy day. Like Microsoft's recent win over the Rustock botnet, the near eradication of Coreflood is a rare exception. Here's hoping they're not the last. ®

The smart choice: opportunity from uncertainty

More from The Register

next story
Yorkshire cops fail to grasp principle behind BT Fon Wi-Fi network
'Prevent people that are passing by to hook up to your network', pleads plod
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
NEW, SINISTER web tracking tech fingerprints your computer by making it draw
Have you been on YouPorn lately, perhaps? White House website?
LibreSSL RNG bug fix: What's all the forking fuss about, ask devs
Blow to bit-spitter 'tis but a flesh wound, claim team
Black Hat anti-Tor talk smashed by lawyers' wrecking ball
Unmasking hidden users is too hot for Carnegie-Mellon
Attackers raid SWISS BANKS with DNS and malware bombs
'Retefe' trojan uses clever spin on old attacks to grant total control of bank accounts
Manic malware Mayhem spreads through Linux, FreeBSD web servers
And how Google could cripple infection rate in a second
Don't look, Snowden: Security biz chases Tails with zero-day flaws alert
Exodus vows not to sell secrets of whistleblower's favorite OS
prev story

Whitepapers

Seven Steps to Software Security
Seven practical steps you can begin to take today to secure your applications and prevent the damages a successful cyber-attack can cause.
Consolidation: The Foundation for IT Business Transformation
In this whitepaper learn how effective consolidation of IT and business resources can enable multiple, meaningful business benefits.
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.
Consolidation: the foundation for IT and business transformation
In this whitepaper learn how effective consolidation of IT and business resources can enable multiple, meaningful business benefits.