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in different formats and for modifying it as you please. Unfortunately, Hex Workshop doesn t support disassembly or assembly of instructions, so if you need to modify an instruction in a program I d generally recommend using OllyDbg, where patching can be performed at the assembly language level. Besides being a patching tool, Hex Workshop is also an excellent program for data reverse engineering, because it supports translating data into organized data structures. Unfortunately, Hex Workshop is not free; it can be purchased at www.bpsoft.com. The screenshot in Figure 4.12 shows a typical Hex Workshop screen. On the right you can see the raw dumped data, both in a hexadecimal and in a textual view. On the left you can see Hex Workshop s structure viewer. The structure viewer takes a data structure definition and uses it to display formatted data from the current file. The user can select where in the file this structured data resides.

Executable dumping is an important step in reversing, because understanding the contents of the executable you are trying to reverse is important for gaining an understanding of what the program does and which other components it interacts with. There are numerous executable-dumping tools available, and in order to be able to make use of their output, you ll probably need to become comfortable with the PE header structure, which is discussed in detail in 3. The following sections discuss the ones that I personally consider to be highly recommended.

M

DUMPBIN is Microsoft s console-mode tool for dumping a variety of aspects of Portable Executable files. Besides being able to show the main headers and section lists, DUMPBIN can dump a module s import and export directories, relocation tables, symbol information, and a lot more. Listing 4.1 shows a typical DUMPBIN output.

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Number 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 Task Tacking Gybing Hoists Drops Start 1/1/2008 1/1/2008 2/2/2008 2/2/2008 End 2/12/2008 2/12/2008 15/3/2008 15/3/2008 27/9/2008 27/9/2008 5/9/2008 5/9/2008 5/8/2008 Duration 30 30 30 30 171 171 70 70 48 180 135 71 44 88 11 15 34 55 48 37

10 4

Microsoft (R) COFF/PE Dumper Version 7.10.3077 Copyright (C) Microsoft Corporation. All rights reserved. Dump of file user32.dll PE signature found File Type: DLL FILE HEADER VALUES 14C machine (x86) 4 number of sections 411096B8 time date stamp Wed Aug 04 10:56:40 2004

Listing 4.1 A typical DUMPBIN output for USER32.DLL launched with the /HEADERS option (continued).

(16.6)

4

file pointer to symbol table number of symbols size of optional header characteristics Executable Line numbers stripped Symbols stripped 32 bit word machine DLL

which is identical to the exact result. The rest of the calculation gives once again = 1.64 and pf = 5.01 10 2 . This is what one would expect from a linear combination of Normal variables. However, the problem could also have been stated in terms of the factor of safety F = 4c H and F 4c 1 = H 2 (16.7) (16.8)

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OPTIONAL HEADER VALUES 10B magic # (PE32) 7.10 linker version 5EE00 size of code 2E200 size of initialized data 0 size of uninitialized data 10EB9 entry point (77D50EB9) 1000 base of code 5B000 base of data 77D40000 image base (77D40000 to 77DCFFFF) 1000 section alignment 200 file alignment 5.01 operating system version 5.01 image version 4.00 subsystem version 0 Win32 version 90000 size of image 400 size of headers 9CA60 checksum 2 subsystem (Windows GUI) 0 DLL characteristics 40000 size of stack reserve 1000 size of stack commit 100000 size of heap reserve 1000 size of heap commit 0 loader flags 10 number of directories 38B8 [ 4BA9] RVA [size] of Export Directory 5E168 [ 50] RVA [size] of Import Directory 62000 [ 2A098] RVA [size] of Resource Directory 0 [ 0] RVA [size] of Exception Directory 0 [ 0] RVA [size] of Certificates Directory 8D000 [ 2DB4] RVA [size] of Base Relocation Directory 5FD48 [ 38] RVA [size] of Debug Directory

2 F

Listing 4.1 (continued)

[ [ [ [ [ [ [ [ [

If the evaluations are done at the mean values of the variables, then F = 0.100 (16.9) (16.10) F

0] 0] 0] 48] 4C] 4E4] A0] 0] 0]

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[size] [size] [size] [size] [size] [size] [size] [size] [size]

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