Malware: Fighting Malicious Code (Paperback)

~ (Author), Lenny Zeltser (Author)

Editorial Reviews

Product Description

Malicious code is a set of instructions that runs on your computer and makes your system do something that you do not want it to do. For example, it can delete sensitive configuration files from your hard drive, rendering your computer completely inoperable; infect your computer and use it as a jumping-off point to spread to all of your buddies' computers; and steal files from your machine. Malicious code in the hands of a crafty attacker is indeed powerful. It's becoming even more of a problem because many of the very same factors fueling the evolution of the computer industry are making our systems even more vulnerable to malicious code. Specifically, malicious code writers benefit from the trends toward mixing static data and executable instructions, increasingly homogenous computing environments, unprecedented connectivity, an ever-larger clueless user base, and an unfriendly world. Skoudis addressed malicious code in just one chapter of his previous book. Here, a dozen chapters focus on one of the most interesting and rapidly developing areas of computer attacks.*Chapter 11, "Defender's Toolbox," rolls together the defensive strategies described in the book.As a bonus, Skoudis gives recipes for creating your own malicious code analysis laboratory using cheap hardware and software.

From the Back Cover

• Reveals how attackers install malicious code and how they evade detection
• Shows how you can defeat their schemes and keep your computers and network safe!
• Details viruses, worms, backdoors, Trojan horses, RootKits, and other threats
• Explains how to handle today's threats, with an eye on handling the threats to come

"This is a truly outstanding book-enormous technical wealth and beautifully written."—Warwick Ford

"Ed does it again, piercing the veil of mystery surrounding many of the more technical aspects of computer security!"—Harlan Carvey, CISSP

"This book is entertaining and informative, while justifiably scaring you. Luckily it also tells you how to protect yourself, but makes you realize it's going to be a permanent spy-vs-spy struggle."—Radia Perlman, Distinguished Engineer, Sun Microsystems

Keep control of your systems out of the hands of unknown attackers

Ignoring the threat of malware is one of the most reckless things you can do in today's increasingly hostile computing environment. Malware is malicious code planted on your computer, and it can give the attacker a truly alarming degree of control over your system, network, and data-all without your knowledge! Written for computer pros and savvy home users by computer security expert Edward Skoudis, Malware: Fighting Malicious Code covers everything you need to know about malware, and how to defeat it!

This book devotes a full chapter to each type of malware-viruses, worms, malicious code delivered through Web browsers and e-mail clients, backdoors, Trojan horses, user-level RootKits, and kernel-level manipulation. You'll learn about the characteristics and methods of attack, evolutionary trends, and how to defend against each type of attack. Real-world examples of malware attacks help you translate thought into action, and a special defender's toolbox chapter shows how to build your own inexpensive code analysis lab to investigate new malware specimens on your own. Throughout, Skoudis' clear, engaging style makes the material approachable and enjoyable to learn. This book includes:

• Solutions and examples that cover both UNIX® and Windows®
• Practical, time-tested, real-world actions you can take to secure your systems
• Instructions for building your own inexpensive malware code analysis lab so you can get familiar with attack and defensive tools harmlessly!

Malware: Fighting Malicious Code is intended for system administrators, network personnel, security personnel, savvy home computer users, and anyone else interested in keeping their systems safe from attackers.

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Product Details

• Paperback: 672 pages
• Publisher: Prentice Hall (November 17, 2003)
• Language: English
• ISBN-10: 0131014056
• ISBN-13: 978-0131014053
• Product Dimensions: 9.2 x 6.9 x 1.6 inches
• Shipping Weight: 2.8 pounds (View shipping rates and policies)
• Average Customer Review: 5.0 out of 5 stars  See all reviews (16 customer reviews)
• Amazon.com Sales Rank: #74,410 in Books (See Bestsellers in Books)

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Customer Reviews

Most Helpful Customer Reviews

24 of 27 people found the following review helpful:

5.0 out of 5 stars Parts of this book should be a must read for EVERYONE!, April 16, 2004

By	John L. Berger (Pennsylvania) - See all my reviews (REAL NAME)

Working with a computer that doesn't want to behave on its own is frustrating enough. Between buggy code and the blue screen of death, many of us have wanted to throw our computers against the wall. Unfortunately, not only do we need to deal with these wonderful, little problems, but we also need to deal with programs that are intentionally trying to inflict problems on or through our computers.

These programs, collectively called "malware", include many different categories; however, we know them best as the "virus", "Trojan horse", "rootkits", "backdoors", and a lot of others. These malware tools (based on "mal", the Latin word for "bad" or "evil") are the bane not only of system administrators but also of the average home user who just doesn't know any better.

"Malware: Fighting Malicious Code" by Ed Skoudis is meant to educate the reader not only of the dangers of malware but also of ways to combat malware.

"To defeat your enemy, you first must know him." - Sun Tzu

This phrase is the core philosophy of this book. This 647-page fighter's manual is the computer-age version of Tzu's "The Art of War", except in this case the war is between you and the low-life morons who create the programs that facilitated the need for Skoudis to write this book.

I found this book to be far more fascinating than I thought it would be. After all, how exciting can a book about virii and Trojan horses really be? "Malware" is written with a surprising amount of detailed, historical facts, real-world examples, and light-hearted humor that help to keep your attention. The author also takes extra steps to differentiate between the various types of malware. After all, how many people do you know who continually (and incorrectly) use "virus", "Trojan horse", and "worm" interchangeably? How many of you are guilty of it yourselves?

"Malware" covers a lot more than you would probably expect such a book to cover. Not only does it cover the more commonly-know malware, such as virii, Trojn horses, and worms, but it also covers topics like ActiveX Controls, Java applets, JavaScript, backdoors, and many others. It also contains a great deal of information on root kits, both user and kernel modes.

Sections of the book even go deeper into the possibilities of malware attacks against the system BIOS and microcode.

Those who expect this book to deal primarily with Windows will likely be surprised in the amount of detail that is given to UNIX (primarily Solaris) and Linux as well as Windows. In fact, each of these have their own chapters with respect to rootkits and kernel attacks. These chapters can be very dry, but there is a great deal of information in these chapters that any serious system administrator who is interested in security (as we all should be) should read.

The author goes into respectable detail regarding how the various types of malware attack and propagate, not only from a basic functional point of view but also from a detailed step-by-step method to explain exactly what each type of malware does at any given step.

An entire chapter is dedicated to analyzing malware. He gives solid theories on how to best set up an environment that will help you to detect, analyze, and build up a defense again malware before you introduce it into your organization. As many system administrators have found out at one time or another, sometimes spending time to find a prevention is much better than wasting time to fix a problem that is allowed to propagate. More often than not, playing "clean up" takes far, far more time than the time it takes to prevent an outbreak in the first place.

With the exception of the excessive dryness of and technical knowledge needed for the various rootkit chapters, I actually ate this book up. The majority of the book is not a difficult read, and I found it fascinating to read how these programs have evolved. In fact, malware has been around a lot longer than most people suspect.

The only problem that I had with the book is that the author was very clearly trying to not anger anyone, which I think forced him to not be straightforward on some issues. In particular, he has a whole chapter about ActiveX malware, yet he very blatantly neglects to mention the easiest and most obvious method of avoiding ActiveX problems - STOP USING INTERNET EXPLORER AND OUTLOOK! These are the only two major tools that use ActiveX since ActiveX is a Microsoft-proprietary component. So, to defend yourself against Internet Explorer and Outlook malware, such as plug-ins that take control of IE, STOP USING THEM! Mozilla, Netscape, and Eudora are free and work beautifully! There is no shame, anger, or bias in telling the truth that the best way to avoid ActiveX problems is to use tools that do not use ActiveX. I'm sure that he knows very well that this is the truth, considering the huge amount of detail that the book entails; but I am very certain that he neglected to say it because he (or the publisher) was skittish about upsetting the All-Powerful, All-Mighty Bill, which is completely unfair to the reader. Yes, I'll admit that I'm being anally retentive on that, but there is nothing wrong with saying, "Hey, folks! There are more secure alternatives out there that (gasp!) have nothing to do with Microsoft!"

Regardless, this book is a must-read for any security administrator who thinks he's knowledgeable about these matters. If you're a security administrator who thinks that you know just about all there is to malware or that a firewall and a virus scanner are all that you need, I can just about guarantee that this book will have your intelligence ego eating humble pie. The fact is that the enemy is far more complicated and intelligent than most network administrators will admit, and this book definitely helps you to know your enemy.

And just consider that the enemy will only get more intelligent and devious in the future.

11 of 11 people found the following review helpful:

5.0 out of 5 stars Levels the Playing Field, December 13, 2003

By	W Boudville (Terra, Sol 3) - See all my reviews (TOP 10 REVIEWER)    (REAL NAME)

Utterly fascinating. It comprehensively surveys the field of malware. It clearly explains viruses, worms and Trojans. Plus, given the universal prevalence of browsers on computers these days, careful attention is given to infiltrations via buggy browsers.

The authors write in an easy to follow style, aimed at the programmer. Though if you are not such, but know the rudiments of computers as a user, you can follow most of the discussion.

If you have ever wondered at the brief explanations of viruses or worms that appear in the general media, or even in the technical magazines, then this is an instructive book. For example, you have probably heard of "buffer overflows". But due to the constraints of space or audience type, the explanations left you unsatisfied. Turn instead here.

Some of you may look with askance upon this book. After all, haven't the authors just written a HowTo for new malware wretches? Strictly, perhaps so. But before you berate the authors, consider this. The top malware writers probably devote the bulk of their formidable intellectual creativity to malware. But if you want to guard against it, and you are a programmer or sysadmin, typically this is not your only responsibility. Without a book like this, it is much harder to come up to speed. You then face a very unlevel playing field.

The only strange thing about this book is that there should be more like it, at its level of detail. If you survey the field of computer books, it can seem like there are multiple books on most topics, not matter how obscure. But on THIS topic, which is of broad, pervasive import to most users, there exists little.

Until now.

9 of 9 people found the following review helpful:

5.0 out of 5 stars Best available, January 28, 2005

By	John A. Faulkner "signalsnatcher" (Sydney, NSW, Australia) - See all my reviews (REAL NAME)

This book provides the best review of malicious software that is presently available. If you need a comprehensive reference then this is the book for you. The author is a well-known and respected security analyst and this book provides solid information at a level suitable for the system administrator. Unlike so many books of this type, it is not a camouflaged endorsement of some vendor's products or a simplistic and alarmist text.

Topics covered include:
- viruses, with a brief history and description of the various types and their mechanisms;
- worms, again with a brief history and description of the various types and their mechanisms;
- mobile code, including browser scripts, ActiveX controls, Java applets and mobile code as it occurs in email clients and distributed applications. Given the increasing amount of mobile code, this is particularly valuable;
- backdoors, particularly Netcat and VNC but covering some others as well;
- trojans inlcuding wrappers, source poisoning and browser co-option;
- rootkits for Unix andWindows;
- kernel-mode rotkits for linux and Windows;
- possible modes, including BIOS and microcode attacks.

"Encyclopediac" is the only description I can give, but be warned that it's not for the general reader, or for newbies.