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T1002 - Data Compressed

Description from ATT&CK

An adversary may compress data (e.g., sensitive documents) that is collected prior to exfiltration in order to make it portable and minimize the amount of data sent over the network. The compression is done separately from the exfiltration channel and is performed using a custom program or algorithm, or a more common compression library or utility such as 7zip, RAR, ZIP, or zlib.

Atomic Tests


Atomic Test #1 - Compress Data for Exfiltration With PowerShell

An adversary may compress data (e.g., sensitive documents) that is collected prior to exfiltration

Supported Platforms: Windows

Inputs:

Name Description Type Default Value
input_file Path that should be compressed into our output file Path $env:USERPROFILE
output_file Path where resulting compressed data should be placed Path $env:USERPROFILE\data.zip

Attack Commands: Run with powershell!

dir #{input_file} -Recurse | Compress-Archive -DestinationPath #{output_file}

Cleanup Commands:

Remove-Item -path #{output_file}


Atomic Test #2 - Compress Data for Exfiltration With Rar

An adversary may compress data (e.g., sensitive documents) that is collected prior to exfiltration

Supported Platforms: Windows

Inputs:

Name Description Type Default Value
input_path Path that should be compressed into our output file Path %USERPROFILE%
file_extension Extension of files to compress String .txt
output_file Path where resulting compressed data should be placed Path %USERPROFILE%\data.rar
rar_installer Winrar installer Path %TEMP%\winrar.exe
rar_exe The RAR executable from Winrar Path %programfiles%/WinRAR/Rar.exe

Attack Commands: Run with command_prompt!

"#{rar_exe}" a -r #{output_file} #{input_path} *#{file_extension}

Cleanup Commands:

del #{output_file}

Dependencies: Run with command_prompt!

Description: Rar tool must be installed at specified location (#{rar_exe})
Check Prereq Commands:
if not exist "#{rar_exe}" (exit /b 1)
Get Prereq Commands:
echo Downloading Winrar installer
bitsadmin /transfer myDownloadJob /download /priority normal "https://www.win-rar.com/fileadmin/winrar-versions/winrar/th/winrar-x64-580.exe" #{rar_installer}
echo Follow the installer prompts to install Winrar
#{rar_installer}


Atomic Test #3 - Data Compressed - nix - zip

An adversary may compress data (e.g., sensitive documents) that is collected prior to exfiltration. This test uses standard zip compression.

Supported Platforms: Linux, macOS

Inputs:

Name Description Type Default Value
input_files Path that should be compressed into our output file, may include wildcards Path $HOME/*.txt
output_file Path that should be output as a zip archive Path $HOME/data.zip

Attack Commands: Run with sh!

zip #{output_file} #{input_files}

Cleanup Commands:

rm -f #{output_file}

Dependencies: Run with sh!

Description: Files to zip must exist (#{input_files})
Check Prereq Commands:
ls #{input_files}
Get Prereq Commands:
echo Please set input_files argument to include files that exist


Atomic Test #4 - Data Compressed - nix - gzip Single File

An adversary may compress data (e.g., sensitive documents) that is collected prior to exfiltration. This test uses standard gzip compression.

Supported Platforms: Linux, macOS

Inputs:

Name Description Type Default Value
input_file Path that should be compressed Path $HOME/victim-gzip.txt
input_content contents of compressed files if file does not already exist. default contains test credit card and social security number String confidential! SSN: 078-05-1120 - CCN: 4000 1234 5678 9101

Attack Commands: Run with sh!

test -e #{input_file} && gzip -k #{input_file} || (echo '#{input_content}' >> #{input_file}; gzip -k #{input_file})

Cleanup Commands:

rm -f #{input_file}.gz


Atomic Test #5 - Data Compressed - nix - tar Folder or File

An adversary may compress data (e.g., sensitive documents) that is collected prior to exfiltration. This test uses standard gzip compression.

Supported Platforms: Linux, macOS

Inputs:

Name Description Type Default Value
input_file_folder Path that should be compressed Path $HOME/$USERNAME
output_file File that should be output Path $HOME/data.tar.gz

Attack Commands: Run with sh!

tar -cvzf #{output_file} #{input_file_folder}

Cleanup Commands:

rm -f #{output_file}

Dependencies: Run with sh!

Description: Folder to zip must exist (#{input_file_folder})
Check Prereq Commands:
test -e #{input_file_folder}
Get Prereq Commands:
echo Please set input_file_folder argument to a folder that exists