The little black book of computer viruses / 1 The basic technology

Computer Virus,Computer Security Computer Viruses Title Page 1 Copyright Information 4 Preface to the Electronic Edition 6 Introduction 9 The Basics of the Computer Virus 18 Types of Viruses 22 The Functional Elements of a Virus 24 Tools Needed for Writing Viruses 26 A Simple COM File Infector 29 Some DOS Basics 29 An Outline for a Virus 34 The Search Mechanism 36 The Copy Mechanism 48 Data Storage for the Virus 52 The Master Control Routine 55 The First Host 58 A Sophisticated Executable Virus 61 The Structure of an EXE File 61 Infecting an EXE File 65 A Persistent File Search Mechanism 68 Anti-Detection Routines 71 Passing Control to the Host 74 A Simple Boot Sector Virus 75 Boot Sectors 75 Necessary Components of a Boot Sector 80 Gutting Out the Boot Sector 84 The Search and Copy Mechanism 85 Taming the Virus 87 A Sophisticated Boot Sector Virus 89 Basic Structure of the Virus 90 The Copy Mechanism 90 The Search Mechanism 94 The Anti-Detection Mechanism 98 Installing the Virus in Memory 100 A Word of Caution 102 Appendix A: The TIMID Virus Source 103 Appendix B: The INTRUDER Virus Source 110 Appendix C: A Basic Boot Sector 126 Appendix D: The KILROY Virus Source 130 Appendix E: The STEALTH Virus Source 138 Appendix F: The HEX File Loader 160 Appendix G: BIOS and DOS Interrupt Functions 163 Appendix H: Suggested Reading 173 American Eagle Catalog 176 Order Form 183 The Little Black Book of Computer Viruses has seen five good years in print. In those five years it has opened a door to seriously ask the question whether it is better to make technical information about computer viruses known or not.