T1022.md

T1022 - Data Encrypted

Description from ATT&CK

Data is encrypted before being exfiltrated in order to hide the information that is being exfiltrated from detection or to make the exfiltration less conspicuous upon inspection by a defender. The encryption is performed by a utility, programming library, or custom algorithm on the data itself and is considered separate from any encryption performed by the command and control or file transfer protocol. Common file archive formats that can encrypt files are RAR and zip.

Other exfiltration techniques likely apply as well to transfer the information out of the network, such as Exfiltration Over Command and Control Channel and Exfiltration Over Alternative Protocol

Atomic Tests

• Atomic Test #1 - Data Encrypted with zip and gpg

• Atomic Test #2 - Compress Data and lock with password for Exfiltration with winrar

• Atomic Test #3 - Compress Data and lock with password for Exfiltration with winzip

• Atomic Test #4 - Compress Data and lock with password for Exfiltration with 7zip

Atomic Test #1 - Data Encrypted with zip and gpg

Encrypt data for exiltration

Supported Platforms: macOS, CentOS, Ubuntu, Linux

Run it with sh!

echo "This file will be encrypted" > /tmp/victim-gpg.txt
mkdir /tmp/victim-files
cd /tmp/victim-files
touch a b c d e f g
zip --password "insert password here" /tmp/victim-files.zip /tmp/victim-files/*
gpg -c /tmp/victim-gpg.txt
<enter passphrase and confirm>
ls -l

Atomic Test #2 - Compress Data and lock with password for Exfiltration with winrar

Note: Requires winrar installation rar a -p"blue" hello.rar (VARIANT)

Supported Platforms: Windows

Run it with command_prompt!

mkdir ./tmp/victim-files
cd ./tmp/victim-files
echo "This file will be encrypted" > ./encrypted_file.txt
rar a -hp"blue" hello.rar
dir

Atomic Test #3 - Compress Data and lock with password for Exfiltration with winzip

Note: Requires winzip installation wzzip sample.zip -s"blueblue" *.txt (VARIANT)

Supported Platforms: Windows

Run it with command_prompt!

path=%path%;"C:\Program Files (x86)\winzip"
mkdir ./tmp/victim-files
cd ./tmp/victim-files
echo "This file will be encrypted" > ./encrypted_file.txt
winzip32 -min -a -s"hello" archive.zip *
dir

Atomic Test #4 - Compress Data and lock with password for Exfiltration with 7zip

Note: Requires 7zip installation

Supported Platforms: Windows

Run it with command_prompt!

mkdir ./tmp/victim-files
cd ./tmp/victim-files
echo "This file will be encrypted" > ./encrypted_file.txt
7z a archive.7z -pblue
dir