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Cybersecurity: Where are the Biggest Threats?

Cyber Crime: Identifying the Sources of an Everyday Threat

Cyber crimes, cyber thievery, and cyber warfare have become an everyday reality. In fact, security breaches are so prevalent that, according to a new study from the National Cyber Security Alliance and a private sector firm, 26 percent of Americans have been the victims of a data breach in the past 12 months alone. Not only do breaches reduce citizens’ trust in government to protect their confidential data, they also cost government agencies a significant amount of money. For most CIOs and other government keepers of data, these statistics prompt one immediate question – “Can this happen to us?” Unfortunately, the answer to this question is: yes, it can. Read More »

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Your Device Is Wide Open on the Internet!

October 30, 2013 at 6:00 am PST

Stop-think-connect is not only for kids. Everyone, including nerds like me and network and security professionals, should pay more attention before connecting any device to the Internet. Routers (wireless and wired), industrial control systems, video surveillance cameras, fire alarm systems, traffic cameras, home and building automation systems, and many other devices are being connected to the Internet every single day, wide open. If you don’t believe me do a quick search on SHODAN.

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To SIEM or Not to SIEM? Part II

The Great Correlate Debate

SIEMs have been pitched in the past as “correlation engines” and their special algorithms can take in volumes of logs and filter everything down to just the good stuff. In its most basic form, correlation is a mathematical, statistical, or logical relationship between a set of different events. Correlation is incredibly important, and is a very powerful method for confirming details of a security incident. Correlation helps shake out circumstantial evidence, which is completely fair to use in the incident response game. Noticing one alarm from one host can certainly be compelling evidence, but in many cases it’s not sufficient. Let’s say my web proxy logs indicate a host on the network was a possible victim of a drive-by download attack. The SIEM could notify the analysts team that this issue occurred, but what do we really know at this point? That some host may have downloaded a complete file from a bad host -- that’s it. We don’t know if it has been unpacked, executed, etc. and have no idea if the threat is still relevant. If the antivirus deleted or otherwise quarantined the file, do we still have anything to worry about? If the proxy blocked the file from downloading, what does that mean for this incident?

This is the problem that correlation can solve. If after the malware file downloaded we see port scanning behavior, large outbound netflow to unusual servers, repeated connections to PHP scripts hosted in sketchy places, or other suspicious activity from the same host, we can create an incident for the host based on our additional details. The order is important as well. Since most attacks follow the same pattern (bait, redirect, exploit, additional malware delivery, check-in), we tie these steps together with security alarms and timestamps. If we see the events happening in the proper order we can be assured an incident has occurred.

 

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To SIEM or Not to SIEM? Part I

Security information and event management systems (SIEM, or sometimes SEIM) are intended to be the glue between an organization’s various security tools. Security and other event log sources export their alarms to a remote collection system like a SIEM, or display them locally for direct access and processing. It’s up to the SIEM to collect, sort, process, prioritize, store, and report the alarms to the analyst. It’s this last piece that is the key to an effective SIEM deployment, and of course the most challenging part. In the intro to this blog series I mentioned how we intend to describe our development of a new incident response playbook. A big first step in modernizing our playbook was a technology overhaul, from an outdated and inflexible technology to a modern and highly efficient one. In this two-part post, I’ll describe the pros and cons of running a SIEM, and most importantly provide details on why we believe a log management system is the superior choice.

Deploying a SIEM is a project. You can’t just rack a new box of packet-eating hardware and expect it to work. It’s important to understand and develop all the proper deployment planning steps. Things like scope, business requirements, and engineering specifications are all factors in determining the success of the SIEM project. Event and alarm volume in terms of disk usage, and retention requirements must be understood. There’s also the issue of how to reliably retrieve remote logs from a diverse group of networked devices without compatibility issues. You must be able to answer questions like: Read More »

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Security Is Pervasive in the Cisco Blog Community

October 21, 2013 at 9:00 am PST

As we pass the halfway point of National Cyber Security Awareness Month (NCSAM), I wanted to call attention to some of our colleagues over on the Cisco Government Blog. Patrick Finn and Peter Romness have been busy this month espousing the need for security and we thought it would be beneficial to expose our readers to their thoughts on security that have been published on the Cisco Government Blog space. Read More »

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