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Lecture 1: Introduction to Reverse Engineering

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Lecture 1: Introduction to Reverse Engineering Boston, 2001 Table of Contents Table of Contents Table of Contents............................................................................................. 2 1. Introduction................................................................................................. 5 1.1 About the Course and Notes ............................................................................ 5 1.2 Definitions...................................................................................................... 5 1.3 Typical Examples ............................................................................................ 6 1.3.1 Hacking ................................................................................................... 7 1.3.2 Hiding Information from Public .................................................................. 7 1.3.3 Cell Phones ............................................................................................ 10 1.3.4 Computer Applications ............................................................................ 10 1.4 Requirements............................................................................................... 12 1.5 Scope .......................................................................................................... 13 1.6 Ethics .......................................................................................................... 13 1.7 Miscellaneous Information ............................................................................. 14 2. Programming Processors ........................................................................... 16 2.1 Programming Languages............................................................................... 16 2.2 Processor Arithmetic ..................................................................................... 18 2.3 Memory Structure ......................................................................................... 22 2.3.1 Variables................................................................................................ 23 2.3.2 Unicode Strings ...................................................................................... 24 2.3.3 Pointers ................................................................................................. 24 3. Windows Anatomy ..................................................................................... 26 3.1 Windows API................................................................................................ 26 3.2 File System .................................................................................................. 27 3.3 File Anatomy ................................................................................................ 28 3.3.1 File Header............................................................................................. 29 3.3.2 Into PE Format ....................................................................................... 31 3.3.3 The PE Header ....................................................................................... 34 3.3.4 Section Table ......................................................................................... 43 3.3.5 Commonly Encountered Sections ............................................................. 51 3.3.6 PE File Imports....................................................................................... 59 2 Table of Contents 3.3.7 PE File Exports ....................................................................................... 62 4. Basic Concepts of Assembly....................................................................... 67 4.1 Registers...................................................................................................... 67 4.2 Flag............................................................................................................. 70 4.3 Memory ....................................................................................................... 71 4.4 Stacks.......................................................................................................... 73 4.5 Interrupts .................................................................................................... 74 5. Assembly Commands ................................................................................. 76 5.1 CMP: Compare Two Operands ....................................................................... 76 5.1.1 Description............................................................................................. 76 5.1.2 Operation............................................................................................... 76 5.1.3 Opcode Instruction Description ................................................................ 77 5.2 J cc: Jump if Condition Is Met ........................................................................ 77 5.2.1 Description............................................................................................. 77 5.2.2 Operation............................................................................................... 79 5.2.3 Opcode Instruction Description ................................................................ 79 5.3 PUSH: Push Word or Doubleword Onto the Stack ............................................ 81 5.3.1 Description............................................................................................. 81 5.3.2 Operation............................................................................................... 82 5.3.3 Opcode Instruction Description ................................................................ 83 5.4 POP: Pop a Value from the Stack ................................................................... 84 5.4.1 Description............................................................................................. 84 5.4.2 Operation............................................................................................... 85 5.4.3 Opcode Instruction Description ................................................................ 88 5.5 AND: Logical AND......................................................................................... 88 5.5.1 Description............................................................................................. 88 5.5.2 Operation and Example ........................................................................... 88 5.5.3 Opcode Instruction Description ................................................................ 89 5.6 NOT: One's Complement Negation ................................................................. 90 5.6.1 Description............................................................................................. 90 5.6.2 Operation and Example ........................................................................... 90 5.6.3 Opcode Instruction Description ................................................................ 90 3 Table of Contents 5.7 OR: Logical Inclusive OR ............................................................................... 91 5.7.1 Description............................................................................................. 91 5.7.2 Operation and Example ........................................................................... 91 5.7.3 Opcode Instruction Description ................................................................ 92 5.8 XOR: Logical Exclusive OR ............................................................................. 92 5.8.1 Description............................................................................................. 92 5.8.2 Operation and Example ........................................................................... 92 5.8.3 Opcode Instruction Description ................................................................ 93 5.9 Other instructions ......................................................................................... 94 5.9.1 CALL: Call Procedure............................................................................... 94 5.9.2 ADD: Add............................................................................................... 99 5.9.3 SUB: Subtract......................................................................................... 99 5.9.4 MUL: Unsigned Multiply........................................................................... 99 5.9.5 DIV: Unsigned Divide ............................................................................ 100 5.9.6 MOV: Move .......................................................................................... 100 6. SoftIce for Windows ................................................................................ 103 6.1 Installing SoftIce ........................................................................................ 103 6.2 Configuring SoftIce ..................................................................................... 105 6.2.1 Resizing Panels..................................................................................... 105 6.2.2 Panels.................................................................................................. 106 6.2.3 Other Useful Settings ............................................................................ 107 6.2.4 SoftIce Window .................................................................................... 107 6.2.5 Symbols............................................................................................... 108 6.3 Breakpoints...............................................................................................
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