Programming Linux Anti-Reversing Techniques
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Contents......Page 2 Preface......Page 5 Using CMake......Page 7 The Code......Page 8 Compiling......Page 11 Executing......Page 13 Accessing the Shell......Page 14 2 Compiler Options......Page 15 -g......Page 16 Recovering the Bind Shell Password with Hexdump......Page 21 Recovering the Bind Shell Password with GDB......Page 23 The Debugging Information in IDA......Page 24 Removing the Debugging Information......Page 25 Case Study: XOR DDOS......Page 27 -s......Page 28 SYMTAB vs. DYNSYM......Page 29 Case Study: The FILE Symbol......Page 33 Examing Trouble After -s......Page 34 Looking at FUNC symbols......Page 36 Hiding FUNC symbols......Page 37 -O......Page 40 Corrected Block Tiny Encryption Algorithm (XXTEA)......Page 41 -Os......Page 47 -O3......Page 49 -funroll-loops......Page 52 Resolving Functions at Runtime......Page 56 ltrace......Page 59 LD_PRELOAD......Page 60 Using musl......Page 63 The Strip Utility......Page 68 Removing the Section Headers Table......Page 72 Little Endian or Big Endian?......Page 82 Flipping the Executable Bit......Page 88 Lying with .init......Page 101 Hiding the Entry Point......Page 111 Mixing the Symbols......Page 122 Code Reorganization......Page 133 Stack Strings......Page 134 XOR Stack String......Page 139 Computing the Function's Size Using a Linker Script......Page 145 Decryption Logic......Page 151 Encryption Logic......Page 158 Creating a Cryptor......Page 166 Implementing the Cryptor......Page 167 Analyzing the Cryptor......Page 172 Indirect Function Calls......Page 178 Signals......Page 183 Early Return......Page 187 Jump Over an Invalid Byte......Page 193 Jump! Jump!......Page 197 Always Follow the Conditional......Page 199 Overlapping Instructions......Page 202 Trace Me......Page 207 Trapping the Debugger......Page 210 Becoming Attached......Page 216 /proc/self/status......Page 219 madvise......Page 223 prctl......Page 232 Detection Before main()......Page 236 Computing Function Checksums......Page 237 Conclusion......Page 246
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