Published on: 2025-07-23

Intelligence Report: FBI urges users to beware worrying Interlock ransomware attacks – TechRadar

1. BLUF (Bottom Line Up Front)

The FBI, along with CISA, HHS, and MS-ISAC, has issued a warning about the Interlock ransomware group, which has rapidly gained notoriety for targeting critical infrastructure in North America and Europe. The group employs double extortion tactics, stealing data and encrypting systems to coerce victims into paying ransoms. Key recommendations include implementing robust cybersecurity measures such as patching systems, enforcing multi-factor authentication, and deploying endpoint detection and response tools.

2. Detailed Analysis

The following structured analytic techniques have been applied to ensure methodological consistency:

Adversarial Threat Simulation

Interlock’s tactics include drive-by downloads, fake browser updates, and the use of remote access trojans and keyloggers. Simulating these actions helps identify potential vulnerabilities and strengthen defenses.

Indicators Development

Monitoring for unusual system behavior, such as unauthorized access attempts or data exfiltration, can provide early warning signs of an Interlock attack.

Bayesian Scenario Modeling

Probabilistic models suggest that Interlock may continue to evolve its tactics, potentially increasing the frequency and sophistication of attacks.

Network Influence Mapping

Mapping the group’s influence and connections can help assess their potential impact and identify other entities at risk.

3. Implications and Strategic Risks

The rise of Interlock poses significant risks to critical infrastructure, potentially disrupting essential services and causing economic damage. The group’s activities may also inspire similar attacks from other cybercriminal entities, increasing the overall threat landscape.

4. Recommendations and Outlook

• Organizations should prioritize cybersecurity training for employees to recognize phishing attempts and suspicious activities.
• Implement network segmentation to limit the spread of ransomware within systems.
• Scenario-based projections suggest that in the best case, enhanced security measures will deter attacks; in the worst case, failure to adapt could lead to widespread disruptions.

5. Key Individuals and Entities

The report does not specify individual names but focuses on the collective actions of the Interlock group and the advisory bodies involved.

6. Thematic Tags

national security threats, cybersecurity, ransomware, critical infrastructure