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Old and Persistent Malware

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Malware can find its way into the most unexpected of places. Certainly, no website can be assumed to be always completely free of malware. Typically, there are many ways that websites can be compromised to serve malware:
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Cisco Security Response Team Opens Its Toolbox

Cisco’s network is a massively complex environment that requires extensive monitoring and remediation. In today’s world of advanced threats and attacks, the company that possesses and positions its tools to preemptively identify and mitigate threats is the one left standing when the dust settles.

Cisco leverages its Computer Security Incident Response Team (CSIRT), a global organization comprised of information security professionals, to monitor, investigate, and respond to cyber security incidents 24x7. The Cisco CSIRT team forms part of the investigative branch of Cisco’s Information Security organization, protecting Cisco from security threats and the loss of its intellectual assets.

With a variety of security tools, CSIRT is able to detect and analyze malicious traffic throughout the network, including virus propagation, targeted attacks, and commonplace exploits. Because CSIRT continually identifies new security threats, the team needs some historical look-back at what occurred on the network. They also need a solution that can dissect the finer details of security incidents while facing the ever-present restrictions with data storage. StealthWatch, a NetFlow monitoring solution from Cisco partner Lancope, contains unique storage, interactivity, and parsing capabilities, to provide a more concise set of data for analysis.

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Operational Security Intelligence

Security intelligence, threat intelligence, cyber threat intelligence, or “intel” for short is a popular topic these days in the Infosec world. It seems everyone has a feed of “bad” IP addresses and hostnames they want to sell you, or share. This is an encouraging trend in that it indicates the security industry is attempting to work together to defend against known and upcoming threats. Many services like Team CymruShadowServerThreatExpertClean MX, and Malware Domain List offer lists of known command and control servers, dangerous URIs, or lists of hosts in your ASN that have been checking-in with known malicious hosts. This is essentially outsourced or assisted incident detection. You can leverage these feeds to let you know what problems you already have on your network, and to prepare for future incidents. This can be very helpful, especially for organizations with no computer security incident response teams (CSIRT) or an under-resourced security or IT operations group.

There are also commercial feeds which range anywhere from basic notifications to full-blown managed security solution. Government agencies and industry specific organizations also provide feeds targeted towards specific actors and threats. Many security information and event management systems (SIEMs) offer built-in feed subscriptions available only to their platform. The field of threat intelligence services is an ever-growing one, offering options from open source and free, to commercial and classified.  Full disclosure: Cisco is also in the threat intelligence business

However the intent of this article is not to convince you that one feed is better than another, or to help you select the right feed for your organization. There are too many factors to consider, and the primary intention of this post is to make you ask yourself, “I have a threat intelligence feed, now what?”  Read More »

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Using a “Playbook” Model to Organize Your Information Security Monitoring Strategy

CSIRT, I have a project for you. We have a big network and we’re definitely getting hacked constantly. Your group needs to develop and implement security monitoring to get our malware and hacking problem under control.

 

If you’ve been a security engineer for more than a few years, no doubt you’ve received a directive similar to this. If you’re anything like me, your mind probably races a mile a minute thinking of all of the cool detection techniques you’re going to develop and all of the awesome things you’re going to find.

I know, I’ll take the set of all hosts in our web proxy logs doing periodic POSTs and intersect that with…

STOP!

 

You shouldn’t leap before you look into a project like this. Read More »

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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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