T1560.002.md

T1560.002 - Archive via Library

Description from ATT&CK

An adversary may compress or encrypt data that is collected prior to exfiltration using 3rd party libraries. Many libraries exist that can archive data, including [Python](https://attack.mitre.org/techniques/T1059/006) rarfile (Citation: PyPI RAR), libzip (Citation: libzip), and zlib (Citation: Zlib Github). Most libraries include functionality to encrypt and/or compress data.

Some archival libraries are preinstalled on systems, such as bzip2 on macOS and Linux, and zip on Windows. Note that the libraries are different from the utilities. The libraries can be linked against when compiling, while the utilities require spawning a subshell, or a similar execution mechanism.

Atomic Tests

• Atomic Test #1 - Compressing data using GZip in Python (Linux)

• Atomic Test #2 - Compressing data using bz2 in Python (Linux)

• Atomic Test #3 - Compressing data using zipfile in Python (Linux)

• Atomic Test #4 - Compressing data using tarfile in Python (Linux)

Atomic Test #1 - Compressing data using GZip in Python (Linux)

Uses GZip from Python to compress files

Supported Platforms: Linux

Inputs:

Name	Description	Type	Default Value
path_to_input_file	Path to the file that you want to compress	Path	/etc/passwd
path_to_output_file	Path of the file that you want your .gz file to be	Path	/tmp/passwd.gz

Attack Commands: Run with bash!

$which_python -c "import gzip;input_file=open('#{path_to_input_file}', 'rb');content=input_file.read();input_file.close();output_file=gzip.GzipFile('#{path_to_output_file}','wb','compresslevel=6');output_file.write(content);output_file.close();"

Cleanup Commands:

rm #{path_to_output_file}

Dependencies: Run with bash!

Description: Requires Python

Check Prereq Commands:

which_python=`which python`; $which_python -V 

Get Prereq Commands:

Atomic Test #2 - Compressing data using bz2 in Python (Linux)

Uses bz2 from Python to compress files

Supported Platforms: Linux

Inputs:

Name	Description	Type	Default Value
path_to_input_file	Path to the file that you want to compress	Path	/etc/passwd
path_to_output_file	Path of the file that you want your .bz2 file to be	Path	/tmp/passwd.bz2

Attack Commands: Run with bash!

$which_python -c "import bz2;input_file=open('#{path_to_input_file}','rb');content=input_file.read();input_file.close();bz2content=bz2.compress(content,compresslevel=9);output_file=open('#{path_to_output_file}','w+');output_file.write(bz2content);output_file.close();"

Cleanup Commands:

rm #{path_to_output_file}

Dependencies: Run with bash!

Description: Requires Python

Check Prereq Commands:

which_python=`which python`; $which_python -V 

Get Prereq Commands:

Atomic Test #3 - Compressing data using zipfile in Python (Linux)

Uses zipfile from Python to compress files

Supported Platforms: Linux

Inputs:

Name	Description	Type	Default Value
path_to_input_file	Path to the file that you want to compress	Path	/etc/passwd
path_to_output_file	Path of the file that you want your .zip file to be	Path	/tmp/passwd.zip

Attack Commands: Run with bash!

$which_python -c "from zipfile import ZipFile; ZipFile('#{path_to_output_file}', mode='w').write('#{path_to_input_file}')"

Cleanup Commands:

rm #{path_to_output_file}

Dependencies: Run with bash!

Description: Requires Python

Check Prereq Commands:

which_python=`which python`; $which_python -V 

Get Prereq Commands:

Atomic Test #4 - Compressing data using tarfile in Python (Linux)

Uses tarfile from Python to compress files

Supported Platforms: Linux

Inputs:

Name	Description	Type	Default Value
path_to_input_file	Path to the file that you want to compress	Path	/etc/passwd
path_to_output_file	Path of the file that you want your .tar.gz file to be	Path	/tmp/passwd.tar.gz

Attack Commands: Run with bash!

$which_python -c "from zipfile import ZipFile; ZipFile('#{path_to_output_file}', mode='w').write('#{path_to_input_file}')"

Cleanup Commands:

rm #{path_to_output_file}

Dependencies: Run with bash!

Description: Requires Python

Check Prereq Commands:

which_python=`which python`; $which_python -V 

Get Prereq Commands: