Research

I’ve been on Twitter for a few years now, and over that time I’ve watched not only its mass adoption, but also how people changed their communication habits. One of the most unexpected changes (for me) is how many people now use Twitter Direct Messages as instant messaging. It’s actually a great feature – with IM someone needs to be online and using a synchronous client, but you can drop a DM anytime you want and, depending on their Twitter settings and apps, it can follow them across any device and multiple communications methods. DM is oddly a much more reliable way to track someone down, especially if they link Twitter with their mobile phone. The problem is that all these messages are persistent, forever, in the Twitter database. And Twitter is now one of the big targets when someone tries to hack you (as we’ve seen in a bunch of recent grudge attacks). I don’t really say anything over DM that could get me in trouble, but I also know that there’s probably plenty in there that, taken out of context, could look bad (as happened when a friend got hacked and some DMs were plastered all over the net). Thus I suggest you delete all your DMs occasionally. This won’t necessarily clear them from all the Twitter apps you use, but does wipe them from the database (and the inboxes of whoever you sent them to). This is tough to do manually, but, for now, there’s a tool to help. Damon Cortesi coded up DM Whacker, a bookmarklet you can use while logged into Twitter to wipe your DMs. Before I tell you how to use it, one big warning: this tool works by effectively performing a Cross-Site Request Forgery attack on yourself. I’ve scanned the code and it looks clean, but that could change at any point without warning, and I haven’t seriously programmed JavaScript for 10 years, so you really shouldn’t take my word on this one. The process is easy enough, but you need to be in the “old” Twitter UI: Go to the DM Whacker page and drag the bookmarklet to your bookmarks bar. Log into Twitter and navigate to your DM page. If you use the “new” Twitter UI, switch back to the “old” one in your settings. Click the bookmarklet. A box will appear in the upper-right of the Twitter page. Select what you want to delete (received and sent) or even filter by user. Click the button, and leave the page running for a while. The process can take a bit, as it’s effectively poking the same buttons you would manually. If you are really paranoid (like me) change your Twitter password. It’s good to rotate anyway. And that’s it. I do wish I could keep my conversation history for nostalgia’s sake, but I’d prefer to worry less about my account being compromised. Also, not everyone I communicate with over Twitter is as circumspect, and it’s only fair to protect their privacy as well. Share:

There’s something I have always struggled with as an analyst. Because of the, shall we say, ‘aggressiveness’ of today’s markets and marketers, most of us in the analyst world are extremely cautious about ever saying anything positive about any vendors. This frequently extends to entire classes of technology, because we worry it will be misused or taken out of context to promote a particular product or company. Or, as every technology is complex and no blanket statement can possibly account for everyone’s individual circumstances, that someone will misinterpret what we say and get pissed it doesn’t work for them. What complicates this situation is that we do take money from vendors, both as advisory clients and as sponsors for papers/speaking/etc. They don’t get to influence the content – not even the stuff they pay to put their logos on – but we’re not stupid. If we endorse a technology and a vendor who offers it has their logo on that paper, plenty of people will think we pulled a pay for play. That’s why one of our hard rules is that we will never specifically mention a vendor in any research that’s sponsored by any vendor. If we are going to mention a vendor, we won’t sell any sponsorship on it. But Mike and I had a conversation today where we realized that we were holding ourselves back on a certain project because we were worried it might come too close to endorsing the potential sponsor, even though it doesn’t mention them. We were writing bad content in order to protect objectivity. Which is stupid. Objectivity means having the freedom to say when you like something. Just crapping on everything all the time is merely being contrarian, and doesn’t necessarily lead to good advice. So we have decided to take off our self-imposed handcuffs. Sometimes we can’t fully dance around endorsing a technology/approach without it ending up tied to a vendor, but that’s fine. They still never get to pay us to say nice things about them, and if some people misinterpret that there really isn’t anything we can do about it. We have more objectivity controls in place here than any other analyst firm we’ve seen, including our Totally Transparent Research policy. We think that gives us the freedom to say what we like. And, to be honest, we can’t publish good research without that freedom. Share:

Everyone’s process is a bit different, but through our research we have found that the best teams tend to gear themselves through three general levels of response, each staffed with increasing expertise. Once the alert triggers, your goal is to filter out the day-to-day crud junior staffers are fully capable of handling, while escalating the most serious incidents through the response levels as quickly as possible. Having a killer investigation team doesn’t do any good if an incident never reaches them, or if their time is wasted on the daily detritus that can be easily handled by junior folks. As mentioned in our last post, Organizing for Response, these tiers should be organized by skills and responsibilities, with clear guidelines and processes for moving incidents up (and sometimes down) the ladder. Using a tiered structure allows you to more quickly and seamlessly funnel incidents to the right handlers – keeping those with the most experience and skills from being distracted by lower-level events. An incident might be handled completely at any given level, so we won’t repeat the usual incident response fundamentals, but instead focus on what to do at each level, who staffs it, and when to escalate. Tier 1: Validate and filter After an incident triggers, the first step is to validate and filter. This means performing a rapid analysis of the alert and either handling it on the spot or passing it up the chain of command. While incidents might trigger off the help desk or from another non-security source, the initial analysis is always performed by a dedicated security analyst or incident responder. The analyst receives the alert and it’s his or her job to figure out whether the incident is real or not, and if it is real, how severe it might be. These folks are typically in your Security Operations Center and focus on “desk analysis”. In other words they handle everything right then and there, and aren’t running into data centers or around hallways. The alert comes in, they perform a quick analysis, and either close it out or pass it on. For simple or common alerts they might handle the incident themselves, depending on your team’s guidelines. The team These are initial incident handlers, who may be dedicated to incident response or, more frequently, carry other security responsibilities (e.g., network security analyst) as well. They tend to be focused on one or a collection of tools in their coverage areas (network vs. endpoint) and are the team monitoring the SIEM and network monitors. Higher tiers focus more on investigation, while this tier focuses more on initial identification. Primary responsibilities: Their main responsibility is initial incident identification, information gathering, and classification. They are the first human filter, and handle smaller incidents and identify problems that need greater attention. It is far more important that they pass information up the chain quickly than try to play Top Gun and handle things over their heads on their own. Good junior analysts are extremely important for quickly identifying more serious incidents for rapid response. Incidents they handle themselves: Basic network/SIEM alerts, password lockouts/failures on critical systems, standard virus/malware. Typically limited to a single area – e.g., network analyst. When they escalate: Activity requiring HR/legal involvement, incidents which require further investigation, alerts that could indicate a larger problem, etc. The tools The goal at this level is triage, so these tools focus on collecting and presenting alerts, and providing the basic investigative information we discussed in the fundamentals series. SIEM: SIEMs aren’t always very useful for full investigations, but do a good job of collecting and presenting top-level alerts and factoring in data from a variety of sources. Many teams use the SIEM as their main tool for initial reduction and scoping of alerts from other tools and filtering out the low-level crud, including obvious false positives. Central management of alerts from other tools helps to identify what’s really happening, even though the rest of the investigation and response will be handled at the original source. This reduces the number of eyeballs needed to monitor everything and makes the team more efficient. Network monitoring: A variety of network monitoring tools are in common use. They tend to be pretty cheap (and there are a few good open source options) and provide good bang for the buck, so you can get a feel for what’s really happening on your network. Network monitoring typically includes NetFlow, collected device logs, and perhaps even your IDS. Many organizations use these monitoring tools either as an extension of their SIEM environment or as a first step toward deeper network monitoring. Full packet network capture (forensics): If network monitoring represents baby steps, full packet capture is your first bike. A large percentage of incidents involves the network, so capturing what happens on the wire is the linchpin of any analysis and response. Any type of external attack, and most internal attacks, eventually involve the network. The more heavily you monitor, the greater your ability to characterize incidents quickly, because you have the data to reconstruct exactly what happened. Unlike endpoints, databases, or applications; you can monitor a network deeply, passively and securely, using tools that (hopefully) aren’t involved in the successful compromise (less chance of the bad guys erasing your network logs). You’ll use the information from your network forensics infrastructure to scope the incident and identify “touch points” for deeper investigation. At this level you need a full packet capture tool with good analysis capabilities – especially given the massive amount of data involved – even if you feed alerts to a SIEM. Just having the packets to look it, without some sort of analysis of them, isn’t as useful. Getting back to our locomotion example, deep analysis of full packet capture data is akin to jumping in the car. Endpoint Protection Platform (EPP) management console: This is often your first source for incidents involving endpoints. It should provide up-to-date information on the endpoint as well as activity logs. Data Loss Prevention