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If you have doubts about whether a file is legitimate or not, several Internet repositories are available to compare cryptographic hashes of known-good files For example, the national Software Reference Library provides libraries of known hashes at http://wwwnsrlnistgov As we ve noted, these are the primary techniques upon which modern Windows root-kits are based By blocking these extensibility points, Microsoft is essentially shutting down the most popular Windows rootkit methodologies We re sure the security research community will find alternatives (perhaps focusing more on user-mode rootkits, or even circumventing some of these controls), but this certainly raises the bar significantly for those willing to invest in x64-based platforms For the full article on this policy change, see http://wwwmicrosoftcom/whdc/driver/kernel/64bitpatchingmspx
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After writing this chapter, we simultaneously wanted to breathe a sigh of relief and to embark on years of further research into Internet user hacking Indeed, we left some highly publicized attacks on the cutting room floor, due primarily to an inability to keep up with the onslaught of new attacks against Internet end users Surely, the Internet community will remain busy for years to come dealing with all these problems and those as yet unimagined In the meantime, remember our Ten Steps to a Safer Internet Experience, which we ll reiterate here in summarized form: 1 Deploy a personal rewall, ideally one that can also manage outbound connection attempts The updated Windows Firewall in XP SP2 and later is a good option 2 Keep up to date on all relevant software security patches Use Windows Automatic Updates to ease the burden of this task (see http://wwwmicrosoftcom/ athome/security/protect/windowsxp/updatesaspx for more information) 3 Run antivirus software that automatically scans your system (particularly incoming mail attachments) and keeps itself updated We also recommend running the antiadware/antispyware and antiphishing utilities discussed in this chapter 4 Con gure the Windows Internet Options control panel (also accessible through IE and Outlook/OE), as discussed in this chapter 5 Run with least privilege Never log on as Administrator (or equivalent highly privileged account) on a system that you will use to browse the Internet or read e-mail 6 Administrators of large networks of Windows systems should deploy the aforementioned technologies at key network chokepoints (for example, network-based rewalls in addition to host-based rewalls, antivirus on mail servers, and so on) to more ef ciently protect large numbers of users 7 Read e-mail in plaintext
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8 Con gure of ce productivity programs as securely as possible; for example, set the Microsoft Of ce programs to Very High macros security under Tools | Macro | Security 9 Don t be gullible Approach Internet-borne solicitations and transactions with high skepticism 10 Keep your computing devices physically secure
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ecause the biggest hurdle of any security assessment is understanding what systems are running on your networks, an accurate listing of ports and their application owners can be critical to identifying the holes in your systems Scanning all 131,070 ports (1 65,535 for both TCP and UDP) for every host can take days (if not weeks) to complete, depending on your technique, so a more fine-tuned list of ports and services should be used to address what we call the Low Hanging Fruit the potentially vulnerable services The following list is by no means a complete one, and some of the applications we present here may be configured to use entirely different ports to listen on However, this list will give you a good start on tracking down those rogue applications The ports listed in this table are commonly used to gain information from or access to computer systems For a more comprehensive listing of ports, see http://wwwianaorg/assignments/port-numbers or http://nmaporg/data/nmap-services Service or Application echo systat chargen ftp-data ssh telnet SMTP nameserver Whois Tacacs xns-time xns-time dns-lookup dns-zone Whois++ Tacacs-ds Oracle-sqlnet Bootps bootpc Tftp gopher Finger Port/Protocol 7/tcp 11/tcp 19/tcp 21/tcp 22/tcp 23/tcp 25/tcp 42/tcp 43/tcp 49/udp 52/tcp 52/udp 53/udp 53/tcp 63/tcp/udp 65/tcp/udp 66/tcp 67/tcp/udp 68/tcp/udp 69/udp 70/tcp/udp 79/tcp
Appendix A:
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