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Files Framework

Files Framework. Motivation. In 2.1 and prior, “ file ” handling... is inconsistent causes performance problems is not extensible not cool. 2. Talking about file handling. Charles Smutz and his Ruminate-IDS project File reassembly Passing files to other tools and parsers. 3.

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Files Framework

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  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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