GC2 – A Command And Control Application That Allows An Attacker To Execute Commands On The Target Machine Using Google Sheet And Exfiltrate Data Using Google Drive

GC2 (Google Command and Control) is a Command and Control application that allows an attacker to execute commands on the target machine using Google Sheet and exfiltrates data using Google Drive.

Why

This program has been developed in order to provide a command and control that does not require any particular set up (like: a custom domain, VPS, CDN, …) during Red Teaming activities.

Furthermore, the program will interact only with Google’s domains (*.google.com) to make detection more difficult.

PS: Please don’t upload the compiled binary on VirusTotal 🙂

Set up

1. Build executable

   git clone https://github.com/looCiprian/GC2-sheet
   cd GC2-sheet
   go build gc2-sheet.go

2. Create a new google “service account”

   Create a new google “service account” using https://console.cloud.google.com/, create a .json key file for the service account

3. Enable Google Sheet API and Google Drive API

   Enable Google Drive API https://developers.google.com/drive/api/v3/enable-drive-api and Google Sheet API https://developers.google.com/sheets/api/quickstart/go

5. Set up Google Sheet and Google Drive

   Create a new Google Sheet and add the service account to the editor group of the spreadsheet (to add the service account use its email)

   

    

   Create a new Google Drive folder and add the service account to the editor group of the folder (to add the service account use its email)

   

6. Start the C2

   <div class="snippet-clipboard-content position-relative overflow-auto" data-snippet-clipboard-copy-content="gc2-sheet –key –sheet –drive “>

   gc2-sheet --key <GCP service account credential file .JSON > --sheet <Google sheet ID> --drive <Google drive ID>