FireEye IDs 450,000-Plus Srizbi Bots Attempting To Connect To Now-Defunct McColo Hosted C&C Servers

Offers recommendations to help victims clean Srizbi infected computers

November 18, 2008

3 Min Read


MILPITAS, Calif. - November 18, 2008 - FireEye, Inc., the leader in global anti-malware and anti-botnet protection, today announced that it has identified over 450,000 IP addresses attempting to connect to now-defunct Srizbi command and control (C&C) servers that were hosted by McColo, a hosting provider that harbored a number of botnet C&C servers. To help squelch Srizbi activity, FireEye is providing recommendations on how victims can unplug from one of the largest botnets in the world.

Although McColo was knocked off the Internet last week due to violations of upstream Internet bandwidth providers' terms of use, the botnet problem continues to escalate as orphaned Srizbi, Rustock, and other botnet PCs attempt to call home to backup C&C infrastructures. In fact, McColo briefly returned to the Internet over the weekend and thousands of Rustock bots were essentially patched and reconnected to a new C&C server in Russia. Detection and prevention remain paramount before the process of reclaiming orphaned Srizbi bots accelerates if/when McColo gets back onto the Internet. Once reclaimed, bots will connect to the new C&C infrastructure and essentially go silent since they will stop the chatter of searching for a live C&C.

"FireEye is dedicated to addressing the growing threats of botnet-related cybercrime affecting businesses and consumers daily," said Ashar Aziz, founder and CEO of FireEye. "We cannot overemphasize the importance of securing against botnets and Web-based malware. FireEye's recent discovery of the massive Srizbi botnet activity in the course of our investigations to help close Internet access to McColo is a testament to how sophisticated the botnet problem really is and we are offering recommendations on how victims can clean their Srizbi infected computers."

FireEye is providing recommendations designed for IT professionals to help them clean Srizbi-infected computers. A summary of these recommendations can be found at the following URL: To learn more about the Srizbi botnet visit,

About the FireEye Solution The FireEye security appliances and FireEye Malware Analysis & Exchange (MAX) Network service together provide comprehensive anti-malware and anti-botnet protection. FireEye appliances use virtual victim machines to analyze enterprise networks for Web-malware and related bot activities on compromised machines. The FireEye MAX Network is a globally deployed malware discovery and analysis service that provides subscribers with the most current botnet and Web malware intelligence to complement on-premise anti-malware security appliances. It catalogs and disseminates security intelligence such as the inbound attack vector as well as the outbound call-back channels used to steal data. This is all derived from malware analyses which are conducted by interconnected networks of FireEye security appliances selectively deployed at service providers around the world. FireEye's solution offers the industry's first complete global and local anti-malware protection to precisely identify, understand, and stop emerging botnet and Web malware threats.

About FireEye, Inc. FireEye, Inc. is the leader in anti-malware and anti-botnet protection, enabling organizations to protect critical intellectual property, computing resources, and network infrastructure against Web malware and botnet infiltration. Today's most damaging attacks are perpetrated through Web malware that forms into highly organized botnets, or networks of remotely controlled, compromised machines. FireEye delivers a complete solution that is designed from the ground up to detect and protect organizations from advanced Web malware and botnets through global and local intelligence and analysis. The company is backed by Sequoia Capital, Norwest Venture Partners, JAFCO, SVB Capital, DAG Ventures, and Juniper Networks. For more information, contact (408) 321-6300 or email: [email protected]. Visit us at ###

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