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Fenris is a multipurpose tracer, GUI debugger, stateful analyzer and partial decompiler intended to simplify bug tracking, security audits, code, algorithm, protocol analysis and computer forensics - providing a structural program trace, interactive debugging capabilities, general information about internal constructions, execution path, memory operations, I/O, conditional expressions and more. Fenris can do traditional, instruction by instruction or breakpoint to breakpoint interactive debugging enhanced by additional structural data about the code delivered to the user; it is able to fingerprint functions in static binaries, reconstruct symbol tables in ELF files based on that information, automatically detect common library code; able to deliver text-based and graphical, browsable output that documents different aspects of program activity on different abstraction layers; able to perform partial analysis of single structural blocks.


Download version 0.07 (stable)
released on 25 June 2002


Related Projects


LicenseVerified byVerified onNotes
GPLv2Janet Casey10 July 2002

Leaders and contributors

Michal Zalewski Maintainer

Resources and communication

Audience Resource type URI
Developer E-mail
Bug Tracking,Support E-mail

Software prerequisites

Kind Description
Required to use OpenSSl
Weak prerequisite xterm
Weak prerequisite ncurses
Weak prerequisite screen
Required to use binutils

This entry (in part or in whole) was last reviewed on 21 January 2008.


Permission is granted to copy, distribute and/or modify this document under the terms of the GNU Free Documentation License, Version 1.3 or any later version published by the Free Software Foundation; with no Invariant Sections, no Front-Cover Texts, and no Back-Cover Texts. A copy of the license is included in the page “GNU Free Documentation License”.

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