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12 Case Studies for Managers
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This chapter addresses the three most common NSM scenarios faced by technical managers I present each case from the perspective of a semifictional organization that must address these issues You will not find this exact company in the phone book, but you may know of real companies that have many of the same characteristics In the first case study, I discuss emergency NSM in an incident response Because few organizations currently deploy NSM-centric solutions, victims often discover their networks are not adequately monitored This section shows how to use NSM once an organization is already compromised You'll see that NSM is helpful to scope the extent of an intrusion, choose response measures, and validate the effectiveness of those countermeasures In the second case study, I offer guidelines for organizations considering the option of outsourcing or cosourcing monitoring duties to a third party In the third case study, I describe how to roll out a complete in-house NSM solution This section focuses on formulating a sensor deployment strategy because all the other aspects of monitoring are covered elsewhere in the book
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Hawke Helicopter Supplies (HHS) is a moderately sized helicopter parts supplier that employs almost 300 people HHS is bidding on a contract to provide helicopter components for a secret government project The government requires HHS to demonstrate the adequacy of its network security While HHS will not be storing any classified information on its servers, the government's procurement orders are considered "sensitive but unclassified" HHS sells helicopter parts to customers around the world via its e-commerce application suite HHS customers establish accounts on the wwwhhsaero Web site and order the supplies they need Traffic transmitted between each customer and the Web site is encrypted using SSL over port 443 TCP HHS ships the supplies from its closest warehouse using a largely automated shipping process HHS then bills the customer on a monthly basis via e-mail invoices
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The aero domain advertised over 1,500 active domain names in late 2003 For more information, visit http://wwwinformationaero/
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The company has invested heavily in link redundancy and performance From an outsider's perspective, security has not been an important concern (This will become clear once you look at the network architecture) HHS management believes in a "prevention first" strategy Money allocated for security was spent on two expensive commercial firewalls to "protect" the internal network The slick salesperson who sold the two firewalls described them to management as "twin guard dogs" The HHS chief executive officer (CEO) liked that analogy and spent well into the six figures to have two of her very own well-bred firewalls Most of the systems deployed by HHS and its partners run Windows NT or Windows 2000 HHS links to several smaller partners that supply parts These partners connect through the Internet via VPNs over T-1 links HHS also supports several remote sales offices that rely on cable modems for connectivity In addition to wired links, HHS supports wireless 80211b connectivity The wireless access point is plugged directly into the enterprise-class switch on the internal network Figure 121 depicts the three types of networks on which HHS conducts business While there is only a single main campus, there are multiple partner and sales offices Only one of each is shown for the sake of examining the network architecture
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Figure 121 HHS network architecture
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Case Study 1: Emergency Network Security Monitoring
Detection of Odd Orders
The afternoon of Friday, October 31, 2003, was not a pleasant one for HHS The sales department issued its invoices via e-mail that morning and expected to see the money start rolling in October's sales looked unusually good, and the staff expected hefty bonuses that month But instead of money, HHS began collecting complaints Angry customers reported seeing charges for helicopter parts they didn't order These parts weren't cheap rotor blades or replacement landing wheels The odd orders were for advanced avionics, navigation, and weapon system computers, with totals exceeding several hundred thousand dollars The sales department contacted the CEO and executive staff as soon as a few customers called Management held an emergency meeting to discuss the situation They theorized that a computer glitch must have generated false orders The chief information officer (CIO) promised that his administrators would work through the weekend to sort out the bugs and fix the problem by Monday morning The logistics manager said she had started verifying inventory at all of her warehouses Were customers being billed for items that had never really been shipped The executive vice president for sales instructed his accounts managers to personally contact all customers and verify their level of satisfaction in recent orders He told them to note any discrepancy between a customer's actual orders and the most recent bill Everyone agreed to stay silent on the issue and to report that a "computer bug" had misprinted the e-mail invoices Near the end of the meeting the top sales executive rushed into the room to say that over one million dollars in false orders had been reported Preliminary reports from HHS warehouses indicated that goods listed as being sold had actually left the company One astute warehouse worker noticed through manual inspection that products sold to one customer usually shipped to Massachusetts That customer's orders in October, however, had mainly departed for countries in eastern Europe