The Dark Web is often seen as a mysterious and fascinating corner of cyberspace.
It’s not easily accessible, as it’s not indexed by search engines and requires specific tools to navigate—like the Tor browser. It serves as a refuge for illegal activity such as drug trafficking, illicit goods, stolen credentials, and data breaches, where users can operate anonymously.

In the current Cyber Threat Intelligence (CTI) landscape, underground forums and the dark web continue to be key resources for identifying emerging threats, stolen data exchanges, and exploit sharing.

Despite the growing and widespread use of Telegram by cybercriminals (a trend that may shift following the arrest of its founder), the dark web and underground forums still play a central role in the distribution of exfiltrated credentials and breach data—and therefore, in CTI operations.

Below are five key forums that every security analyst should monitor :

1. Nulled

Nulled is a forum dedicated to sharing stolen credentials, compromised accounts, and pirated software. It also offers access to hacking tools, fraud scripts, and bots for automated attacks.

It’s a go-to resource for those seeking illegal access to popular digital services—and thus, a crucial intelligence source for professionals working to prevent fraud and data breaches.

2. Dread

Dread is a Reddit-style anonymous forum on the dark web, where various illicit activities are discussed, including DDoS attacks, malware, illegal trade, and online fraud.

Cybercriminals use Dread to share experiences, breach data, and tools for attacks. The wide range of topics and its ever-growing community make it a major hub of insight into emerging threats and cybercriminal techniques.

3. Exploit.in

Exploit.in is one of the most well-known and influential forums in the cybercrime ecosystem, focused on the sale of exploits, malware, and advanced hacking tools.

Its strong reputation comes from the quality of its content, often centered around zero-day vulnerabilities and exploits unknown to the public. In addition to trading advanced tools, Exploit.in hosts detailed discussions among cybercrime professionals, who collaborate on sophisticated attacks and share techniques for exploiting specific vulnerabilities.

This forum is essential for monitoring if your goal is to prevent advanced attacks and stay ahead of the threat landscape.

4. XSS

Previously known as DaMaGeLab, XSS is one of the top forums for Russian-speaking cybercriminals. It stands out for the technical level of its discussions and its trading of advanced exploits, zero-day vulnerabilities, and malware.

It is also frequented by professional hackers and APT groups (Advanced Persistent Threats). XSS is a key source for innovative hacking tools and intelligence on new exploits.

State-sponsored actors and independent criminals use the platform to plan sophisticated campaigns, making it a critical monitoring target for threat analysts.

5. BreachForums

After being seized by the FBI in 2023, BreachForums resurfaced in mid-2024. Founded as a successor to RaidForums, it quickly became one of the largest hubs for trading sensitive data and stolen information.

Following its shutdown, many users migrated to other platforms. However, lite versions of the forum soon began reappearing, growing fast in an attempt to restore its former status.

Today, BreachForums is once again active, offering a large collection of pirated software, data breaches, and user credential dumps.

Monitoring the Dark Web

In today’s digital age, the dark web has become a breeding ground for cybercrime and illegal activity, posing a serious threat to both consumers and businesses.

Implementing dark web monitoring is a critical step for organizations to detect potential cyber risks, data breaches, and underground criminal activity. When done effectively, dark web monitoring allows companies to anticipate threats and react promptly, protecting both their own infrastructure and their customers.

Monitoring exfiltrated credentials is particularly important to reduce entry points for attackers—thus improving organizational security.

Dark web monitoring is not just about risk mitigation—it's also a way to proactively improve your security posture and make informed decisions in your risk management strategies.