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If you need remote access to the monitor, you can use a network connection or a modem One approach is to install a second network adapter, connect it to a separate network or virtual LAN (VLAN), and then install remote command-level software such as OpenSSH You should restrict the incoming IP addresses to those sites that are under your control
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Another option is to access the system via a modem line for out-of-band communications, or communications that cannot be intercepted easily by an attacker Ensure that the remote access via modem is secure by requiring a minimum of user ID/password authentication You might also want to configure the remote access via modem line so that it accepts only calls that come from specific phone numbers
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It s difficult for intruders to erase evidence that they are not aware of Implementing a silent sniffer is the most foolproof way of preventing intruders from discovering your monitoring system A silent sniffer is a system that will not respond to any packets it receives directed IP datagrams, broadcast, or multicast Many commercial sniffer applications will configure the network adapters for you, putting your listening interface into stealth mode To achieve the maximum stealth, you must configure your interface to speak only TCP/IP Some other protocols, such as NetBIOS, create a lot of traffic that would compromise the location of your monitor Unix systems are generally configured out of the box to communicate with TCP/IP only On Windows systems, you need to make sure that you unbind all protocols (NetBIOS and IPX) except for TCP/IP You should also disable your system from responding to Address Resolution Protocol (ARP) packets, or your monitor may be detected by the attacker Most Unix systems support ifconfig command-line options to turn off ARP on your listening interface If the monitoring software requires an IP address on the listening interface, assign the system a null IP address (0000) Another way to implement a silent monitor is to use a one-way Ethernet cable Many agencies disconnect the transmit wires on their network cabling, which offers an inexpensive, yet effective way to minimize the chances of your sniffer system being discovered or exploited The one-way connection protects the machine from any interactive attacks Before deploying your monitor, it is a good idea to run a port scanner (such as Nmap) against it, as well as a sniffer detection tool (such as L0pht s AntiSniff)
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When choosing a tool for full-content monitoring, it is prudent to consider how the information captured on your system is stored Most commercial applications have proprietary file formats, which can make case preparation difficult when other commercial or law enforcement entities get involved Choosing software that creates files in an openstandard format will save you (and others) many headaches Here are some examples of sniffers, both commercial and freely available, that use their own proprietary format for the binary capture files they create: M Lawrence Livermore National Labs (LLNL) libpcap-based sniffers (tcpdump, Ethereal, and Snort)
8:
Collecting Network-based Evidence
I I I I I I I L
Sun Solaris Snoop IBM AIX s iptrace HP-UX s nettl (Network Tracing and Logging Tool) Network Associates Sniffer Pro AG Group s Etherpeek Novell s LANalyzer RADCOM s WAN/LAN Analyzer Cisco Secure Intrusion Detection System (CSIDS)
Remember that apart from verifying the proper operation of the monitor, capturing and replaying traffic are never performed concurrently In the examples in this chapter, we use tcpdump and WinDump to capture traffic When we move into the analysis phase in 14, we will use Ethereal to replay and view the traffic We use Ethereal because it is included under the GNU license, it can read most types of sniffer data files, and it can run on most versions of Linux, Solaris, BSD, and Windows It also runs on Tru64 (Digital Unix), SGI Irix, and IBM s AIX
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