Full Report
From a Europol press release: A major online forum for stolen data has been dismantled following an international operation coordinated by Europol. The forum, known as LeakBase, had established itself as a central hub in the cybercrime ecosystem, specialising in the trade of leaked databases and so-called “stealer logs” – archives of stolen credentials harvested... Source
Analysis Summary
# Incident Report: Dismantling of the LeakBase Cybercrime Forum
## Executive Summary
In a coordinated international effort led by Europol, the major cybercrime forum "LeakBase" was dismantled on March 4, 2026. Prior to its seizure, the platform served as a primary hub for the trade of stolen databases and "stealer logs" harvested from infostealer malware. The operation resulted in approximately 100 enforcement actions globally, including the arrest and investigation of dozens of high-profile users.
## Incident Details
- **Discovery Date:** Pre-March 2026 (Investigation duration undisclosed)
- **Incident Date:** March 3–4, 2026
- **Affected Organization:** LeakBase (Cybercrime forum)
- **Sector:** Cybercrime Underground / Data Brokerage
- **Geography:** Global (Multiple jurisdictions coordinated by Europol)
## Timeline of Events
### Initial Access
- **Date/Time:** March 3, 2026
- **Vector:** Law Enforcement Intervention
- **Details:** Authorities executed approximately 100 enforcement actions worldwide, targeting the infrastructure and the human element behind the forum.
### Lateral Movement
- **N/A:** Law enforcement targeted 37 of the platform's most active users through arrests, house searches, and "knock-and-talk" interventions across several countries.
### Data Exfiltration/Impact
- **N/A:** The primary impact was the disruption of a major marketplace. The platform was seized before further criminal transactions could occur.
### Detection & Response
- **How it was discovered:** Multi-jurisdictional intelligence gathering and tracking of illicit data trades.
- **Response actions taken:** Domain seizure, technical disruption of the hosting infrastructure, and physical arrests of key contributors.
## Attack Methodology
*(Note: As this was a Law Enforcement operation against a criminal entity, the methodology describes the disruption and the forum's operations)*
- **Initial Access:** Multi-national law enforcement coordination.
- **Persistence:** Law enforcement replaced the forum domain with a splash page to maintain control.
- **Privilege Escalation:** Not specified.
- **Defense Evasion:** Forum operated on the open web in English to maximize reach but used "stealer logs" to facilitate further crimes.
- **Credential Access:** The forum specialized in selling "stealer logs" (archives of stolen credentials).
- **Discovery:** Tracking active users through forum metadata and financial trails.
- **Lateral Movement:** Coordinated strikes across multiple jurisdictions simultaneously.
- **Collection:** Evidence collection from seized servers and searched residences.
- **Exfiltration:** N/A.
- **Impact:** Technical dismantling and domain seizure.
## Impact Assessment
- **Financial:** Disruption of a major engine in the multi-million dollar stolen data economy.
- **Data Breach:** The forum was a repository for millions of stolen credentials and databases; its seizure prevents further sale of this data.
- **Operational:** Total shutdown of the LeakBase platform and communication channels.
- **Reputational:** Public deterrent to people using similar "open web" forums for illicit activities.
## Indicators of Compromise
- **Network indicators:** hxxps[://]leakbase[.]io (and associated domains/IPs now displaying the Europol splash page)
- **File indicators:** Archives containing infostealer malware logs (e.g., RedLine, Vidar, Raccoon logs).
- **Behavioral indicators:** Trade of bulk CSV/SQL database dumps and browser-harvested credential logs.
## Response Actions
- **Containment measures:** Simultaneous arrests to prevent "burning" of evidence or warnings to other members.
- **Eradication steps:** Technical disruption of the web infrastructure.
- **Recovery actions:** Transition to a "prevention phase" aimed at deterring forum users through awareness and legal consequences.
## Lessons Learned
- **Key takeaways:** Cybercrime forums operating on the open web are increasingly vulnerable to coordinated international law enforcement actions.
- **What could have been done better:** Information sharing between smaller regional police forces and Europol is critical for identifying "active users" who often believe they are anonymous.
## Recommendations
- **Prevention measures:**
- Organizations should monitor for their domain names in "stealer logs" to identify compromised employee or customer credentials early.
- Implementation of Multi-Factor Authentication (MFA) to nullify the value of the credentials sold on such forums.
- Continued support for international law enforcement cooperation to target the infrastructure of the cybercrime ecosystem.