What is the Darknet?
The Darknet is a hidden part of the internet that cannot be reached through standard browsers or search engines. It uses encrypted networks such as Tor or I2P, in which users can share information, communicate or exchange data anonymously.
While the Darknet has legitimate uses (privacy, journalism), it is best known as a platform for cybercrime, including the trade in exploits, credentials, Malware and OT-specific vulnerabilities.
🌐 Darknet vs. Deep Web vs. Surface Web
| Layer | Description |
|---|---|
| Surface Web | Publicly accessible internet (e.g. Google, Wikipedia, corporate websites) |
| Deep Web | Non-indexed content such as intranets, paywalls, email, databases |
| Darknet | Anonymous network within the Deep Web, only reachable via specialised software (e.g. Tor, I2P, Freenet) |
🧠 Why is the Darknet relevant to OT security?
| Threat | Example in an OT context |
|---|---|
| Credentials of HMI or SCADA | Leaked RDP/VPN passwords for sale on .onion marketplaces |
| Sale of zero-days or exploits | Specifically targeted at PLC brands or ICS protocols |
| Ransomware-as-a-Service | The Darknet provides ready-made attack kits for OT networks |
| Discussions of vulnerable OT infrastructure | Forums and Telegram chats trading access to industrial systems |
Many attacks on OT networks begin with information that has been leaked or traded via the Darknet.
🔎 Monitoring & threat intelligence
| Tool | Purpose |
|---|---|
| Darknet monitoring services (MSSP) | Detection of leaked credentials, IP addresses, firmware or configurations |
| Threat Intelligence platforms | Correlation with Indicators of Compromise (IoC) for known threats |
| Security Operations Center (SOC) | Integration with SIEM for warnings and alerts |
| Anomaly detection | Recognition of attempts to abuse leaked data |
✅ Best practices
- Use Darknet threat feeds to monitor for leaks involving your organisation
- Periodically check for credential dumps and firmware leaks via specialists
- Use 2FA, Zero Trust, Access Control and Least Privilege to limit damage
- Train staff on Security Awareness regarding spear phishing using Darknet information
- Document procedures in your Incident Response Plan for Darknet-related attacks
🧩 Notable attacks
| Incident | Darknet element |
|---|---|
| Colonial Pipeline | Sale of stolen VPN credentials on forums |
| Triton / Trisis | ICS malware discussed on underground hacking channels |
| 3CX Supply Chain | Origins of the malware code partly traced back to anonymous networks |
📌 In summary
The Darknet is both a critical source of intelligence and a threat vector in OT/IT security. Targeted monitoring of leaked data and criminal activity allows you to respond preventively to future attacks.