Date:
15 August 2025

Location:
London, United Kingdom

Article:
A coordinated Distributed Denial-of-Service (DDoS) attack has disrupted online services of multiple global banks, causing transaction delays and access issues for millions of customers across Europe, Asia, and North America. The Cyber Security Intelligence Systems (CSIS) has confirmed that the incident is linked to an international cybercrime syndicate operating through botnets spread across more than 45 countries.

The attack, which began late Thursday night, peaked at over 3.2 terabits per second, overwhelming critical infrastructure and forcing banks to activate emergency cybersecurity protocols. CSIS threat analysts report that the botnet used compromised IoT devices, unsecured routers, and outdated servers to generate massive traffic spikes.

“This is one of the largest DDoS incidents of 2025 and highlights the urgent need for stronger network resilience,” said Deva E, Founder of CSIS. “Financial institutions must invest in real-time threat intelligence and global mitigation partnerships to handle such scale.”

Early intelligence suggests that the attackers may be using the disruption as a smokescreen for data theft and fraudulent transactions. Cybersecurity agencies, including Europol, FBI Cyber Division, and Interpol, are assisting in the investigation.

CSIS Recommendations for Financial Sector:

• Deploy DDoS mitigation solutions with real-time monitoring.
• Segment critical banking infrastructure to limit attack impact.
• Regularly audit IoT devices connected to internal networks.
• Share threat intelligence with industry peers and CERT teams.
• Conduct red team exercises to test attack resilience.

CSIS will continue to monitor the situation and provide updated intelligence reports as the investigation unfolds. Organizations can access CSIS cyber threat advisories via csisofficial.com.