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.

This Agreement covers only the version 1.10 of the OllyDbg and version 1.10 of the OllyDbg Plugin Development Kit. All other versions are covered by separate License Agreements.

OllyDbg 2.0 lives, and it makes plenty of fun again to develop. You've waited for so long - so be patient, please, and sooner or later I'll introduce you my promising younger son :)

Read this for quick start. Consult help file for details and more features.

October 24, 2013 - first presentation of the 64-bit OllyDbg. What is even not an alpha, buggy as hell and can't debug? - OllyDbg 64! (This is a joke).

The source is a slightly stripped version of code used in OllyDbg v1.04 and is well proven by its numerous users. (If you haven't heard before, OllyDbg is a 32-bit Assembler level debugger …

OllyDbg remembers all patches applied to debugged application in previous debugging sessions. From the Patch window, you can quickly apply patches or restore original code;

The appearing dialog is non-modal, so you still have full access to all OllyDbg features. You can browse code and data, set breakpoints, modify memory and so on.

OllyDbg allows you to scan the code and extract the list of commands referencing all (well, most of) text strings, either ASCII, UNICODE or, if enabled in options, Pascal-style and search …

To link your plugin to OllyDbg, you also need import library ollydbg.lib. Some compilers (Borland) include utility called implib that scans executable file (in our case, ollydbg.exe) and produces a …