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As with the many other security threats we ve discussed in this book, there are preventative, detective, and reactive controls you can implement to protect yourself from the threat of malware Before we begin this section, let s make it clear that we are not going to talk much about prevention here, because we already covered that heavily in our previous discussion of general countermeasures This discussion will assume for the most part that a compromise has already occurred and that preventative measures have failed for one reason or another (which is, after all, what most malware relies upon quite heavily) For 9999 percent of users, who lack a sophisticated understanding of the issues we are about to discuss, we recommend you either follow the recommendations provided by your installed security software, adhere to your organizational security policies, or seek professional assistance in dealing with a computer security incident, intrusion, or compromise Microsoft provides common security software vendor contact information at http://wwwmicrosoft com/athome/security/protect/supportmspx and also offers no-charge support for virus and other security-related issues, 24 hours a day, for the US and Canada at 1-866-PCSAFETY, or 1-866-727-2338 For other regions, see http://supportmicrosoftcom/common/internationalaspx
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If you think your system has been victimized by malware, one of the first things to do is unplug the network cable(s) This prevents further communication with remote controlling entities that may react to attempts to investigate or clean the system, and it also prevents the infected host from spreading the infection to other systems on the network (assuming it hasn t already) or performing other nefarious tasks such as DDoS With the network cable unplugged, you now have time to investigate and identify the root cause of the observed issues, whether they are infection-related or not Of course, this also makes it difficult to utilize the great resources on the Internet or internal networks for examining and cleaning the system; use good judgment about when and how to reconnect
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If you confirm a malware infection on your system, you have two choices: Assume that the malware you found was the only malware installed on your system, clean it with the appropriate tools and/or techniques, and move on with life Assume that the malware you found was only one of potentially many infections on your system that took advantage of whatever vulnerable state it was in, back up your critical data, erase the system, and rebuild from trusted sources
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Obviously, if you select the first option, you take additional risks Of course, if you select the second option, you potentially incur significant work Again, use good judgment Administrators of large numbers of systems might also consider documenting a policy on exactly what situations justify each option, to head off nasty disagreements during the heat of a response to a real computer security incident, intrusion, or compromise We ve found that such a policy usually looks something like the following: Systems identified as compromised shall be investigated by the [authorized computer forensic team] The team shall make a judgment within 24 hours as to the nature of the compromise and make a recommendation as to whether specific cleansing or a complete flatten and rebuild is warranted In all cases, compromises resulting in unauthorized, nonautomated remote control of a system shall require flattening and rebuilding The forensic team s recommendation shall be implemented across all systems and lines of business, except in those specific instances where an exception is granted by the Security Group
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For 99 percent of the infections you are likely to encounter, standard antivirus software is sufficient to detect and clean malware on your system (and if you have it installed before you get infected, chances are that the malware was detected and blocked before it even had a chance to infect you!) We ve also covered antispyware programs, which have become popular lately (see the previous section in this chapter covering deceptive software such as spyware, adware, and spam) Although antivirus and antispyware programs tend to overlap somewhat, we think they are mostly complementary today, and we recommend maintaining both for the time being When it comes to rootkits, back doors, and bots, the situation becomes more complex Most antivirus software will detect the default installations of such tools, but with only the barest of customizations, they become undetectable using the standard antivirus signature databases And although antivirus programs also use heuristics (rules-based examination designed to identify polymorphic or metamorphic malware), we ve yet to see the big antivirus vendors start looking for techniques such as kernel hooking and modification Remember also that many antivirus programs use the very same hooking techniques to identify malware, so if the rootkit gets there first, the antivirus software won t see it Enter the world of computer security forensics, typically only entered by practiced professionals, and definitely not recommended for the uninitiated when serious issues such as monetary damages are at stake or when legal standards for evidence preservation must be maintained A number of professional firms specialize in computer forensic examinations, including New Technologies International (NTI; see http://www forensics-intlcom) Also, commercial tools are available, such as Encase from Guidance Software (see http://wwwguidancesoftwarecom), although such highly specialized tools tend to be quite expensive
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