Bro Module for File Extraction
This is a Bro package that provides convenient extraction of files.
As a secondary goal, this script performs additional commonly requested file extraction and logging tasks, such as naming extracted files after their calculated file checksum or naming the file with its common file extension.
Installing with bro-pkg (preferred)
This package can be installed through the bro package manager by utilizing the following commands:
bro-pkg install bro/hosom/file-extraction
# you must separately load the package for it to actually do anything
bro-pkg load bro/hosom/file-extractionInstalling manually
While not preferred, this package can also be installed manually. To do this, follow the tasks below:
cd <prefix>/share/bro/site
git clone git://github.com/hosom/file-extraction file-extraction
echo "@load file-extraction" >> local.bro
Configuration
The package installs with the extract-common-exploit-types.bro policy, however, additional functionality may be desired.
Configuration must always be done within the config.bro file. Failure to isolate configuration to config.bro will result in your configuration being overwritten.
Advanced Configuration
For advanced configuration of file extraction, the best option available is to hook the FileExtraction::extract hook. For examples of this, look at the scripts in the plugins directory.
Plugins
extract-all-files.bro
Attaches the extract files analyzer to every file that has a mime_type detected.
extract-java.bro
Attaches the extract files analyzer to every JNLP and Java Archive file detected.
extract-pe.bro
Attaches the extract files analyzer to every PE file detected.
extract-ms-office.bro
Attaches the extract files analyzer to every ms office file detected.
extract-pdf.bro
Attaches the extract files analyzer to every PDF file detected.
extract-common-exploit-types.bro
Loads the following plugins:
- extract-java.bro
- extract-pe.bro
- extract-ms-office.bro
- extract-pdf.bro
store-files-by-md5.bro
Uses file_state_remove to rename extracted files based on the md5 checksum whenever it is available.
store-files-by-sha1.bro
Uses file_state_remove to rename extracted files based on the sha1 checksum whenever it is available.
store-files-by-sha256.bro
Uses file_state_remove to rename extracted files based on the sha256 checksum whenever it is available.