Maltrieve is a community-driven project and we happily accept contributions from anyone interested in helping with malware research. To keep things well-organized and flowing smoothly, here are a few guidelines.
You need a GitHub account for most everything like opening or commenting on issues, or submitting code patches (the GitHub parlance here is "pull request").
Yes, Maltrieve has bugs. Some of them we know about (and are working on), others we need somebody to tell us about. If you submit a bug report (issue), please be sure to include the actual program output and let us know anything relevant about the environment (OS and Python version, for example, or if you have made any changes to the code).
The easiest and best way to do this is to fork our repository and then send a pull request. In your description, please be sure to note any related issues (for example, if your PR fixes a previously-reported bug or implements an existing enhancement request). We will review and possibly request additional changes before merging. The best patches will be those that conform to PEP8 and refrain from introducing new dependencies as much as possible. Sometimes that will be okay, of course, if it does something new and awesome! Also please keep in mind that Maltrieve is released under the GPL v3 and this will include all code sent back to us.
If you just want to get in touch, you can always reach me on Twitter as @kylemaxwell or using the email address "kylem@xwell.org".