Full Report
Hacking PlayStation DualShock controllers to stream audio to their internal speakers. Ciao a tutti. Introduction I didn’t really know what this project was going to be about and where or how it would end up. The only thing I know is that I started working on it because one day I was bored and having a chat with a friend of mine: Your flat is like a Luna Park for nerds. Just look around and, I am sure, you’ll figure out what to do. — He said.
Analysis Summary
# Tool/Technique: Dual-Pod-Shock (Audio Streaming to DualShock 4 Speaker)
## Overview
This research details a process and proof-of-concept (PoC) designed to exploit the built-in mono speaker of the Sony PlayStation 4 DualShock 4 (DS4) controller to stream custom audio data from a connected computer. The objective was to demonstrate the capability of turning the controller into an unexpected audio output device.
## Technical Details
- Type: Technique / Proof of Concept (PoC)
- Platform: Windows/Linux (used Kali 2019.4), targeting PlayStation 4 DualShock 4 (DS4) controllers (V1: JDM-001, JDM-011, JDM-020, JDM-030; V2: JDM-040, JDM-050, JDM-055) when paired via Bluetooth.
- Capabilities: Sending custom control reports via Bluetooth HID interface ($/dev/hidraw1) to force the DS4 speaker to play encoded audio (SBC format). It also details methods for extending the controller's Bluetooth antenna range.
- First Seen: Published January 24, 2020
## MITRE ATT&CK Mapping
This technique primarily relates to controlling connected hardware and non-standard data transmission:
- **TA0004 - Privilege Escalation** (Indirectly, by leveraging device functionality outside of normal user expectation)
- **T1546 - Event Triggered Execution** (If the script is set up to run automatically upon device connection)
- **TA0008 - Lateral Movement** (If audio streams contained command-and-control data, though not explicitly stated)
- **TA0011 - Command and Control** (Data exfiltration or low-bandwidth C2 potential via audio/vibration changes, though this focuses on output)
- **T1090 - Proxy** (If the controller was used as an intermediary output device)
*(Note: Direct mapping is difficult as this is hardware exploitation based on custom protocol interaction rather than typical malware execution. The focus is on abusing legitimate hardware features for unintended data output.)*
## Functionality
### Core Capabilities
1. **Bluetooth Pairing:** Successfully pairing the DS4 controller with a Linux machine (Kali 2019.4) as an audio device via Bluetooth, bypassing the need for a PIN (often using PS + SHARE buttons).
2. **Protocol Identification:** Identifying the relevant Bluetooth HID raw device handle (e.g., `/dev/hidraw1`).
3. **Audio Encoding:** Converting source audio (MP3) into the required **SBC (Subband Coding)** format, specifically configured with parameters suitable for streaming (e.g., rate=32000, channels=2, blocks=16, bitpool=25).
4. **Packet Construction:** Creating a custom report ID 15 (334 bytes in size) containing the SBC encoded audio data, which is sent periodically (every second) to the controller.
### Advanced Features
1. **Simultaneous Control:** Report ID 15 was chosen because it also allows control over the controller's Lightbar LED color and vibration motors concurrent with audio streaming.
2. **Antenna Modification:** Detailed hardware manipulation techniques (soldering/IPX connector usage) were described for extending the Bluetooth antenna range on various DS4 PCB revisions (JDM-001 through JDM-030).
## Indicators of Compromise
- File Hashes: Not provided in the article (PoC code availability noted on GitHub).
- File Names: `audiofilename.mp3`, `audiofilename.sbc`
- Registry Keys: Not applicable (Linux/Bluetooth focus).
- Network Indicators: N/A (Local communication via Bluetooth HID). However, an example number mentioned for triggering sound *on the PS4 itself* was **3465550155**.
- Behavioral Indicators:
- A device recognized as a Bluetooth audio sink appears unexpectedly.
- Periodic sending of HID reports (ID 15) to the controller device handle (e.g., `/dev/hidraw1`).
- Audio output emanating from the DS4 controller speaker when not expected by the running game/application.
## Associated Threat Actors
- This appears to be a researcher-developed Proof of Concept (PoC): **Emmanuel Cristofaro (SensePost)**.
- No established threat actor groups were explicitly linked to utilizing this technique for malicious purposes.
## Detection Methods
- Signature-based detection: Not detailed, but signatures could target the specific SBC encoding streams sent over the Bluetooth HID channel (Report ID 15 structure).
- Behavioral detection: Monitoring for external programs writing data to Bluetooth raw HID interfaces (`/dev/hidraw*` or equivalent on other OSes) and manipulating DS4 features (LEDs, vibration) simultaneously.
- YARA rules: Not provided.
## Mitigation Strategies
- **Firmware Updates:** Ensure the DS4 controller firmware is up-to-date, as patches may restrict non-standard HID report usage.
- **Configuration Control:** Limit or monitor unauthorized Bluetooth pairings on sensitive systems.
- **Hardware Security:** For environments requiring high security, disable or physically remove Bluetooth capabilities if the controller is not strictly required for operation.
- **Monitoring:** Implement Host Intrusion Detection Systems (HIDS) to monitor read/write access to low-level hardware interface files (e.g., `/dev/hidraw*`).
## Related Tools/Techniques
- Exploitation/abuse of other peripheral hardware speakers (e.g., printer speakers, sound cards) for covert communication channels.
- Usage of Bluetooth Low Energy (BLE) profile exploitation for command injection on other connected devices.