OllyDbg is a 32-bit assembler-level debugger for examining Windows programs, particularly when source code is unavailable. It disassembles machine code, traces registers and identifies procedures, loops, strings, tables and API calls. Users can set conditional, logging, memory or hardware breakpoints, attach to running and multithreaded programs, inspect memory, and save patches back to executable files. Its plugin architecture supports third-party extensions.

OllyDbg is a 32-bit assembler-level debugger for examining and controlling Windows programs. It is intended for developers, software analysts and other users who need to investigate executable code, especially when source code is unavailable. Its disassembler presents machine instructions alongside analysis of program structure, helping make unfamiliar binaries easier to follow without relying on cryptic commands.

During analysis, OllyDbg traces register values and identifies procedures, loops, switches, tables, constants, strings and API calls. It decodes calls to more than 1,900 standard Windows API functions and 400 C functions, and can display context-sensitive API help from an external help file. The disassembler can use MASM or IDEAL syntax, while its handling of MMX, 3DNow! and SSE instructions and data types supports inspection of code using those instruction sets. ASCII and Unicode strings, including Delphi-format strings, are recognized dynamically.

The debugger can load an executable or DLL directly, attach to a running program, and work with multithreaded applications. Conditional, logging, memory and hardware breakpoints let an analyst stop execution at specific events or record activity; tracing can follow program flow and log arguments passed to known functions. Memory views support searching allocated memory, finding references to constants or address ranges, and examining or changing values while a program is paused. Stack-frame tracing and fixup information provide further context when investigating execution and executable data.

For code and file analysis, OllyDbg scans object files and libraries to locate routines, and searches for imprecise instructions or masked binary sequences. Users can add labels, comments and function descriptions to clarify findings. Patches can be saved between sessions and written back to an executable, with fixups updated; the built-in assembler encodes instructions in their shortest binary form. An open plugin architecture extends the workflow with third-party additions, and debugging information in Borland format is supported.

OllyDbg is freeware and runs on Windows, including Windows 7. It is distributed without an installer, so it does not add files to system directories or make registry changes as part of installation. Its focus is low-level, 32-bit code analysis rather than ordinary application development, making it suited to debugging, reverse engineering and learning how compiled Windows programs behave. It also supports Unicode and can start from removable media such as a floppy disk.

New Release
· Multi language GUI (experimental, as yet no translation files - please do it by yourself)
· Support for AVS instuctions (as yet no AVS2 and high 16 bytes of YMM registers are not displayed)
· Call stack window (similar to the version 1.10)
· Handles window (similar to the version 1.10)
· SEH and VEH chains. To decode addresses of VEH handlers, OllyDbg hacks NTDLL.RtlAddVectoredExceptionHandler(), therefore process must be started from the OllyDbg
· Multibyte character dumps
· udl image libraries, replace scan of object files from v1.10
· Search for integers and floats in dump
· Search for procedures (entry points)
· Limited support for NTFS streams
· Drive dump
· Software breakpoints that use INT1, HLT, CLI, STI or INSB instead of INT3
· Multiple watches in one line, support for repeat count
· Dump of arrays of structures
· Micro-analyzers
· Accelerated search
· Assembling of immediate data statements (DB xx etc.)
· Highlighting in run trace
· Up to 2 ordinals per address
[ OllyDbg release history ]

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