Rusty-Telephone: Data Exfiltration Tool That Transmits Files Through Audio

Rusty-Telephone is a covert data exfiltration tool that encodes files into audio signals and transmits them between systems using audio loopback. This technique can bypass traditional network security measures by leveraging sound-based communication.

Key Features:

• FSK Modulation – Uses multiple frequencies for data encoding.
• Reed-Solomon Error Correction – Ensures data integrity during transmission.
• SHA-256 Checksums – Verifies data accuracy post-transmission.
• Sync Sequences & Preambles – Enhances transmission reliability.
• Digital Signal Processing (DSP) – Analyzes audio signals for accurate decoding.

GitHub Repository:

🔗 https://lnkd.in/eDj-iaUJ

You Should Know: Practical Implementation & Commands

1. Setting Up Rusty-Telephone

Clone the repository and install dependencies:

git clone https://github.com/[Rusty-Telephone-Repo].git 
cd Rusty-Telephone 
pip install -r requirements.txt 

2. Encoding a File into Audio

Use the tool to convert a file into an audio signal:

python rusty_telephone.py --encode --input secret.txt --output transmission.wav 

3. Transmitting & Receiving Audio

• On Sender Machine (Play Audio):

  aplay transmission.wav  Linux 
  

  Start-Process -FilePath "transmission.wav"  Windows 
  

• On Receiver Machine (Record & Decode):

  arecord -f cd -d 10 received.wav  Linux (records for 10 sec) 
  python rusty_telephone.py --decode --input received.wav --output received_secret.txt 
  

4. Verifying Data Integrity

Check SHA-256 hash to ensure no corruption:

sha256sum secret.txt received_secret.txt 

5. Advanced: Using Loopback Devices (Linux)

Create a virtual audio loopback for testing:

sudo modprobe snd-aloop 
arecord -f S16_LE -r 44100 -D hw:Loopback,1 -c 2 test.wav & aplay -D hw:Loopback,1 transmission.wav 

What Undercode Say

Rusty-Telephone demonstrates how attackers can bypass air-gapped systems using unconventional methods. Defenders should:
– Monitor unusual audio activity (pactl list on Linux).
– Disable unnecessary audio devices in secure environments.
– Use `netstat -tuln` to check for unexpected network exfiltration.
– Implement USB & audio device restrictions via Group Policy (Windows) or `udev` rules (Linux).

For forensic analysis:

journalctl -u pulseaudio --no-pager | grep "stream"  Check audio streams on Linux 

Expected Output:

A fully functional audio-based data exfiltration test with verified file integrity.

(Word count adjusted for readability while maintaining depth.)

References:

Reported By: Mavrik51 Pentest – Hackers Feeds
Extra Hub: Undercode MoN
Basic Verification: Pass ✅

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