# Simple File Server

The Simple File Server Handler allows file downloads and file uploads.

• Supports file downloads via HTTP requests to endpoints specified in the handler configuration entry. Multiple URL prefixes are supported.
  • Supports downloading via curl, certutil.exe, bitsadmin
  • If no prefixes are provided in the configuration entry, the default will be to serve files from handlers/simplefileserver/files at URL prefix /files
• Supports file uploads via HTTP POST request to the /uploads endpoint
  • Requires sending file content via POST body and file name via filename HTTP header
• Prevents directory listing for file endpoints.

To enable and configure the Simple File Server handler within the control server, edit the corresponding handler config file within the config/ directory in the main C2 server repo. Create or adjust an existing handler entry as needed.

Example:

simplefileserver:
  host: 10.0.2.7
  port: 80
  mappings:
    - prefix: /files
      dir: /tmp/mypayloads
    - prefix: /files2
      dir: /tmp/mypayloads2
  enabled: true

for each entry in mappings, prefix specifies the URL prefix for file requests, and dir specifies the path on disk to fetch files from. Subdirectories are automatically supported as long as they exist on disk. Do not add a / at the end of a prefix value.

Run the controlServer binary as sudo and look for success messages in starting up the Simple File Server handler:

sudo ./controlServer -c config/yourconfigfile.yml