Gray Hat Python - Python Programming for Hackers and Reverse Engineers

en: Julio 18, 2017, 11:06:58 am

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1
SETTING UP YOUR DEVELOPMENT ENVIRONMENT 1
1.1 Operating System Requirements ......................................................................... 2
1.2 Obtaining and Installing Python 2.5 ................................................................... 2
1.2.1 Installing Python on Windows ............................................................ 2
1.2.2 Installing Python for Linux .................................................................. 3
1.3 Setting Up Eclipse and PyDev ............................................................................ 4
1.3.1 The Hacker’s Best Friend: ctypes ........................................................ 5
1.3.2 Using Dynamic Libraries ................................................................... 6
1.3.3 Constructing C Datatypes .................................................................. 8
1.3.4 Passing Parameters by Reference ....................................................... 9
1.3.5 Defining Structures and Unions .......................................................... 9
2
DEBUGGERS AND DEBUGGER DESIGN 13
2.1 General-Purpose CPU Registers......................................................................... 14
2.2 The Stack... 16
2.3 Debug Events ................................................................................................. 18
2.4 Breakpoints ... 18
2.4.1 Soft Breakpoints.............................................................................. 19
2.4.2 Hardware Breakpoints..................................................................... 21
2.4.3 Memory Breakpoints ....................................................................... 23
3
BU ILD ING A W INDOWS DEBUGGER 25
3.1 Debuggee, Where Art Thou?............................................................................ 25
3.2 Obtaining CPU Register State........................................................................... 33
3.2.1 Thread Enumeration ........................................................................ 33
3.2.2 Putting It All Together....................................................................... 35
3.3 Implementing Debug Event Handlers ................................................................. 39
3.4 The Almighty Breakpoint .................................................................................. 43
3.4.1 Soft Breakpoints.............................................................................. 43
3.4.2 Hardware Breakpoints..................................................................... 47
3.4.3 Memory Breakpoints ....................................................................... 52
3.5 Conclusion... 55
x Contents in Detail
4
PYDBG—A PURE PYTHON W INDOWS DEBUGGER 57
4.1 Extending Breakpoint Handlers......................................................................... 58
4.2 Access Violation Handlers................................................................................ 60
4.3 Process Snapshots........................................................................................... 63
4.3.1 Obtaining Process Snapshots ........................................................... 63
4.3.2 Putting It All Together....................................................................... 65
5
IMMUN ITY DEBUGGER—THE BEST O F BOTH WORLDS 69
5.1 Installing Immunity Debugger............................................................................ 70
5.2 Immunity Debugger 101 .................................................................................. 70
5.2.1 PyCommands ................................................................................. 71
5.2.2 PyHooks ........................................................................................ 71
5.3 Exploit Development........................................................................................ 73
5.3.1 Finding Exploit-Friendly Instructions ................................................... 73
5.3.2 Bad-Character Filtering .................................................................... 75
5.3.3 Bypassing DEP on Windows ............................................................ 77
5.4 Defeating Anti-Debugging Routines in Malware .................................................. 81
5.4.1 IsDebuggerPresent .......................................................................... 81
5.4.2 Defeating Process Iteration ............................................................... 82
6
HOOKING 85
6.1 Soft Hooking with PyDbg ................................................................................. 86
6.2 Hard Hooking with Immunity Debugger ............................................................. 90
7
DLL AND CODE INJECT ION 97
7.1 Remote Thread Creation .................................................................................. 98
7.1.1 DLL Injection ................................................................................... 99
7.1.2 Code Injection.............................................................................. 101
7.2 Getting Evil .................................................................................................. 104
7.2.1 File Hiding ................................................................................... 104
7.2.2 Coding the Backdoor .................................................................... 105
7.2.3 Compiling with py2exe.................................................................. 108
8
FUZZING 111
8.1 Bug Classes ................................................................................................. 112
8.1.1 Buffer Overflows ........................................................................... 112
8.1.2 Integer Overflows ......................................................................... 113
8.1.3 Format String Attacks..................................................................... 114
8.2 File Fuzzer ................................................................................................... 115
8.3 Future Considerations.................................................................................... 122
8.3.1 Code Coverage............................................................................ 122
8.3.2 Automated Static Analysis.............................................................. 122
Contents in Detail xi
9
SULLEY 123
9.1 Sulley Installation .......................................................................................... 124
9.2 Sulley Primitives ............................................................................................ 125
9.2.1 Strings ......................................................................................... 125
9.2.2 Delimiters..................................................................................... 125
9.2.3 Static and Random Primitives.......................................................... 126
9.2.4 Binary Data.................................................................................. 126
9.2.5 Integers ....................................................................................... 126
9.2.6 Blocks and Groups........................................................................ 127
9.3 Slaying WarFTPD with Sulley ......................................................................... 129
9.3.1 FTP 101....................................................................................... 129
9.3.2 Creating the FTP Protocol Skeleton .................................................. 130
9.3.3 Sulley Sessions ............................................................................. 131
9.3.4 Network and Process Monitoring .................................................... 132
9.3.5 Fuzzing and the Sulley Web Interface ............................................. 133
10
FUZZING WINDOWS DRIVERS 137
10.1 Driver Communication ................................................................................. 138
10.2 Driver Fuzzing with Immunity Debugger......................................................... 139
10.3 Driverlib—The Static Analysis Tool for Drivers................................................. 142
10.3.1 Discovering Device Names .......................................................... 143
10.3.2 Finding the IOCTL Dispatch Routine............................................... 144
10.3.3 Determining Supported IOCTL Codes ............................................ 145
10.4 Building a Driver Fuzzer .............................................................................. 147
11
IDAPYTHON—SCRIPTING IDA PRO 153
11.1 IDAPython Installation.................................................................................. 154
11.2 IDAPython Functions.................................................................................... 155
11.2.1 Utility Functions........................................................................... 155
11.2.2 Segments ................................................................................... 155
11.2.3 Functions ................................................................................... 156
11.2.4 Cross-References......................................................................... 156
11.2.5 Debugger Hooks......................................................................... 157
11.3 Example Scripts .......................................................................................... 158
11.3.1 Finding Dangerous Function Cross-References................................. 158
11.3.2 Function Code Coverage ............................................................. 160
11.3.3 Calculating Stack Size................................................................. 161
12
PYEMU—THE SCRIPTABLE EMULATOR 163
12.1 Installing PyEmu.......................................................................................... 164
12.2 PyEmu Overview......................................................................................... 164
12.2.1 PyCPU....................................................................................... 164
12.2.2 PyMemory.................................................................................. 165
12.2.3 PyEmu ....................................................................................... 165
xii Contents in Detail
12.2.4 Execution................................................................................... 165
12.2.5 Memory and Register Modifiers .................................................... 165
12.2.6 Handlers.................................................................................... 166
12.3 IDAPyEmu .................................................................................................. 171
12.3.1 Function Emulation ...................................................................... 172
12.3.2 PEPyEmu.................................................................................... 175
12.3.3 Executable Packers...................................................................... 176
12.3.4 UPX Packer ................................................................................ 176
12.3.5 Unpacking UPX with PEPyEmu ...................................................... 177

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