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Another good tool is DumpEvt from Somarsoft (free from http://wwwsomarsoft com) DumpEvt dumps the entire security Event Log in a format suitable for import to an Access or SQL database However, this tool is not capable of filtering on specific events Another nifty free tool is Event Comb from Microsoft (see http://supportmicrosoft com/kb/308471) Event Comb is a multithreaded tool that will parse Event Logs from many servers at the same time for specific event IDs, event types, event sources, and so on All servers must be members of a domain, because EventCombWindows works only by connecting to a domain first ELM Log Manager from TWindows Software (http://wwwtntsoftwarecom) is also a good tool ELM provides centralized, real-time event-log monitoring and notification across all Windows versions, as well as Syslog and SNMP compatibility for non-Windows systems Although we have not used it ourselves, we ve heard very good feedback from consulting clients regarding ELM Real-Time Burglar Alarms The next step up from log analysis tools is a real-time alerting capability Windows intrusion-detection/prevention detection (IDS/IPS) products and security event and information monitoring (SEIM) tools remain popular options for organizations looking to automate their security monitoring regime An in-depth discussion of IDS/IPS and SEIM is outside the scope of this book, unfortunately, but security-conscious administrators should keep their eyes on these technologies What could be more important than a burglar alarm for your Windows network

CHAPTER 12:

Popularity: Simplicity: Impact: Risk Rating: 6 4 9 6

3 In the Main Entry text box, change the suggested entry if necessary 4 In the Subentry text box, type the text for any subentry you want to create 5 In the Options area, choose whether to mark the index entry with a page number, a page range, or a cross-reference:

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Password guessing is hard work Why not just sniff credentials off the wire as users log in to a server and then replay them to gain access If an attacker is able to eavesdrop on Windows login exchanges, this approach can spare a lot of random guesswork There are three flavors of eavesdropping attacks against Windows: LM, NTLM, and Kerberos Attacks against the legacy LanManager (LM) authentication protocol exploit a weakness in the Windows challenge/response implementation that makes it easy to exhaustively guess the original LM hash credential (which is the equivalent of a password that can either be replayed raw or cracked to reveal the plain text password) Microsoft addressed this weakness in Windows 2000, and tools that automate this attack will only work if at least one side of the authentication exchange is NT 4 or previous Tools for attacking LM authentication include Cain by Massimiliano Montoro (http://wwwoxid it), LCP (available from http://wwwlcpsoftcom), and L0pthcrack with SMB Packet Capture (which is no longer maintained) Although password sniffing is built into L0phtcrack and Cain via the WinPcap packet driver, you have to manually import sniffer files into LCP in order to exploit the LM response weakness The most capable of these programs is Cain, which seamlessly integrates password sniffing and cracking of all available Windows dialects (including LM, NTLM, and Kerberos) via brute force, dictionary, and Rainbow cracking techniques (you will need a valid paid account to use Rainbow cracking) Figure 4-2 shows Cain s packet sniffer at work sniffing NTLM session logons These are easily imported into the integrated cracker by right-clicking the list of sniffed passwords and selecting Send All to Cracker Oh, and in case you think a switched network architecture will eliminate the ability to sniff passwords, don t be too sure Attackers can perform a variety of ARP spoofing techniques to redirect all your traffic through the attackers, thereby sniffing all your traffic (Cain also has a built-in ARP poisoning feature; see 7 for more details on ARP spoofing) Alternatively, an attacker could attract Windows authentication attempts by sending out an e-mail with a URL in the form of file://attackerscomputer/ sharename/messagehtml By default, clicking on the URL attempts Windows authentication to the rogue server ( attackerscomputer in this example) The more robust Kerberos authentication protocol has been available since Windows 2000 but also fell prey to sniffing attacks The basis for this attack is explained in a 2002 paper by Frank O Dwyer Essentially, the Windows Kerberos implementation sends a preauthentication packet that contains a known plaintext (a timestamp) encrypted with a key derived from the user s password Thus, a brute force or dictionary attack that decrypts the preauthentication packet and reveals a structure similar to a standard timestamp unveils the user s password This has been a known issue with Kerberos 5 for.

number next to the index entry (for example, global warming, 483 )

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