Tecno For knowledge

OllyDbg is a 32-bit assembler level analysing debugger for Microsoft^®Windows^®. Emphasis on binary code analysis makes it particularly useful in cases where source is unavailable. OllyDbg is a shareware, but you can download and use it for free. Special highlights are:

I have signifiicantly changed the way OllyDbg and plugins interact with each other. For example, all functions with fixed number of arguments are declared as __cdecl instead of __stdcall. This removes problem with Visual C that always wants to emit something like _Disasm@32 instead of plain _Disasm or Disasm. Otherwise there are only minor changes. Among them, several of OllyBugs are no longer.

Bookmark plugin now works with 4 different compilers: Borland C++ Builder 5.0 (ancient but still my favorite), command-line Borland C++ 5.5 (produces exactly the same DLL), Visual C++ 2005 (Express Edition) and Code::Blocks (in fact, MinGW which is GNU for Windows). There are separate import libraries for each. Plugin source is identical in all cases. I hope that VC library will also work with all otrher Visual versions. Detailed description will be available later - as always.


Help on API is extended but not as far as I expected. Again: If you need some API function or family that is not yet documented, drop me a mail and Ill try to describe it ASAP.

Other new features in this version:

• Patch manager, similar to 1.10
• Shortcut editor, supports weird things like Ctrl+Win+$ etc. Now you can customize and share your shortcuts. I havent tested it on Win7, please report any found bugs and incompatibilities!
• Instant .udd file loading. In the previous versions Ive postponed analysis, respectivcely reading of the .udd file till the moment when all external links are resolved. But sometimes it took plenty of time, module started execution and was unable to break on the breakpoints placed in the DLL initialization routine
• Automatic search for the SFX entry point, very raw and works only with several packers. Should be significantly more reliable than 1.10. If you tried it on some SFX and OllyDbg was unable to find real entry, please send me, if possible, the link or executable for analysis!
• "Go to" dialog lists of matching names in all modules
• Logging breakpoints can protocol multiple expressions. Here is an example: I ask OllyDbg to protocol the contents of EAX, EBX and 4 memory doublewords starting at address ESP. Expressions must be separated by commas, repeat count has form SIZE*N, N=1..32: 

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