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Enhancing File Handling in Bro Framework: From Inconsistencies to Performance Boost

Explore the evolution of file handling in Bro framework, from Charles Smutz's Ruminate-IDS project to groundbreaking realizations about file streams and data extraction. Learn about the source-agnostic nature of files and the innovative file manager component. Discover the Forensic Logging capabilities and included file analyzers like Extraction, Hashing, and more. Uncover the future potential for file reassembly and comprehensive file data availability in scriptland.

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Enhancing File Handling in Bro Framework: From Inconsistencies to Performance Boost

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Presentation Transcript

  1. Files Framework

  2. Motivation • In 2.1 and prior, “file” handling... • is inconsistent • causes performance problems • is not extensible • not cool 2

  3. Talking about file handling • Charles Smutz and his Ruminate-IDS project • File reassembly • Passing files to other tools and parsers 3

  4. Realizations • A “file” is a single flow byte stream • Hint: a connection is bidirectional so it’s a dual flow bytestream • Bro can have file analyzers that work incrementally like our protocol analyzers • How many file types would you like to be able to parse? 4

  5. Realizations (cont’d.) • A “file” is another base abstraction in Bro • files.log and conn.log have a lot of similarities • Files have unique IDs just like connections 5

  6. Files are source agnostic • Files out of files • Files out of any unencrypted file protocol • Input framework 6

  7. Implementation • Keep file data out of script land • No reassembly yet, but design decisions were made to support it in a future release • File manager is a completely new internal component of Bro that accepts file data from anywhere it can be acquired 7

  8. Forensic Logging - conn.log 8

  9. Forensic Logging - http.log 9

  10. Forensic Logging - files.log 10

  11. Forensic Logging - pe.log 11

  12. Forensic Logging - notice.log 12

  13. 13

  14. Included File analyzers • Extraction • Hashing • MD5, SHA-1, SHA-256 • Entropy - Not in preview release • Data • Make file data available in scriptland • PE - Windows executables, still in development 14

  15. Exercises 15

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