OllyDbg description
A 32-bit assembler level analysing debugger for Microsoft Windows.

OllyDbg is a 32-bit assembler level analysing debugger for Microsoft Windows. When the source code is unavailable, OllyDbg is particularly useful as it focuses on binary code analysis.

Here are some key features of "OllyDbg":

· Intuitive user interface, no cryptical commands
· Code analysis - traces registers, recognizes procedures, loops, API calls, switches, tables, constants and strings
· Directly loads and debugs DLLs
· Object file scanning - locates routines from object files and libraries
· Allows for user-defined labels, comments and function descriptions
· Understands debugging information in Borland® format
· Saves patches between sessions, writes them back to executable file and updates fixups
· Open architecture - many third-party plugins are available
· No installation - no trash in registry or system directories
· Debugs multithread applications
· Attaches to running programs
· Configurable disassembler, supports both MASM and IDEAL formats
· MMX, 3DNow! and SSE data types and instructions, including Athlon extensions
· Full UNICODE support
· Dynamically recognizes ASCII and UNICODE strings - also in Delphi ormat!
· Recognizes complex code constructs, like call to jump to procedure
· Decodes calls to more than 1900 standard API and 400 C functions
· Gives context-sensitive help on API functions from external help file
· Sets conditional, logging, memory and hardware breakpoints
· Traces program execution, logs arguments of known functions
· Shows fixups
· Dynamically traces stack frames
· Searches for imprecise commands and masked binary sequences
· Searches whole allocated memory
· Finds references to constant or address range
· Examines and modifies memory, sets breakpoints and pauses program on-the-fly
· Assembles commands into the shortest binary form
· Starts from the floppy disk


Requirements:

· 586/100 processor (586/300+ recommended)
· 64 MB physical memory (128 MB recommended)
· At least 2 MB free disk space
· VGA display (SVGA with screen resolution at least 800x600 is strongly recommended)
· Mouse or compatible pointing device (required)