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Cloudflare Mitigates 26 Million Request Per Second DDoS Attack

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Last week, Cloudflare automatically detected and mitigated a 26 million request per second DDoS attack — the largest HTTPS DDoS attack on record. The attack targeted a customer website using Cloudflare’s Free plan. Similar to the previous 15M rps attack, this attack also originated mostly from Cloud Service Providers as opposed to Residential Internet Service Providers, indicating the use of hijacked virtual machines and powerful servers to generate the attack — as opposed to much weaker Internet of Things (IoT) devices.

Record-breaking attacks
Over the past year, we’ve witnessed one record-breaking attack after the other. Back in August 2021, we disclosed a 17.2M rps HTTP DDoS attack, and more recently in April, a 15M rps HTTPS DDoS attack. All were automatically detected and mitigated by our HTTP DDoS Managed Ruleset which is powered by our autonomous edge DDoS protection system.

The 26M rps DDoS attack originated from a small but powerful botnet of 5,067 devices. On average, each node generated approximately 5,200 rps at peak. To contrast the size of this botnet, we’ve been tracking another much larger but less powerful botnet of over 730,000 devices. The latter, larger botnet wasn’t able to generate more than one million requests per second, i.e. roughly 1.3 requests per second on average per device. Putting it plainly, this botnet was, on average, 4,000 times stronger due to its use of virtual machines and servers.

Also, worth noting that this attack was over HTTPS. HTTPS DDoS attacks are more expensive in terms of required computational resources because of the higher cost of establishing a secure TLS encrypted connection. Therefore, it costs the attacker more to launch the attack, and for the victim to mitigate it. We’ve seen very large attacks in the past over (unencrypted) HTTP, but this attack stands out because of the resources it required at its scale.

Within less than 30 seconds, this botnet generated more than 212 million HTTPS requests from over 1,500 networks in 121 countries. The top countries were Indonesia, the United States, Brazil and Russia. About 3% of the attack came through Tor nodes. The top source networks were the French-based OVH (Autonomous System Number 16276), the Indonesian Telkomnet (ASN 7713), the US-based iboss (ASN 137922) and the Libyan Ajeel (ASN 37284).

The DDoS threat landscape
It’s important to understand the attack landscape when thinking about DDoS protection. When looking at our recent DDoS Trends report, we can see that most of the attacks are small, e.g. cyber vandalism. However, even small attacks can severely impact unprotected Internet properties. On the other hand, large attacks are growing in size and frequency — but remain short and rapid. Attackers concentrate their botnet’s power to try and wreak havoc with a single quick knockout blow — trying to avoid detection.

DDoS attacks might be initiated by humans, but they are generated by machines. By the time humans can respond to the attack, it may be over. And even if the attack was quick, the network and application failure events can extend long after the attack is over — costing you revenue and reputation. For this reason, it is recommended to protect your Internet properties with an automated always-on protection service that does not rely on humans to detect and mitigate attacks.

Helping build a better Internet
At Cloudflare, everything we do is guided by our mission to help build a better Internet. The DDoS team’s vision is derived from this mission: our goal is to make the impact of DDoS attacks a thing of the past. The level of protection that we offer is unmetered and unlimited — It is not bounded by the size of the attack, the number of the attacks, or the duration of the attacks. This is especially important these days because as we’ve recently seen, attacks are getting larger and more frequent.

Cyber Security

Beyond Blocklists: How Behavioural Intent Analysis Can Safeguard Middle East Businesses from Rising AI-Driven Bot Threats

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The Middle East is facing an unprecedented surge in AI-driven bot attacks, with malicious automation now outpacing traditional defenses. Mohammad Ismail, Vice President for EMEA at Cequence Security, warns that legacy tools like IP blocklists and rate limiting are no match for today’s sophisticated threats (more…)

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Cyber Security

Sophos Boosts Firewall with New Protection and Incident Response Features

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Sophos has announced a significant update to its Sophos Firewall software, introducing enhanced protection and incident response capabilities. This update notably includes Sophos NDR Essential, a new feature now available free of charge to all customers holding an XStream Protection license for Sophos Firewall.

This integration empowers Sophos Firewall with two dedicated artificial intelligence (AI) engines specifically designed to detect both malware communications and those utilizing algorithmically generated domain names. This advanced functionality, derived from the Sophos Network Detection and Response (NDR) probe, aims to identify sophisticated malware communications even if they are previously unknown or not yet indexed. It serves as a powerful complement to the Active Threat Response capabilities already embedded within Sophos firewalls.

Chris McCormack, Senior Product Marketing Manager at Sophos

Addressing the technical demands of such advanced detection, Chris McCormack, Senior Product Marketing Manager at Sophos, explained the strategic approach, “NDR traffic analysis requires substantial processing power. That’s why we’ve adopted a new approach by deploying an NDR solution in Sophos Cloud to offload the heaviest tasks from the firewall.” This cloud-centric design ensures optimal performance without burdening the firewall’s on-device resources.

Beyond network detection, the update also brings significant improvements to connectivity and user authentication. Sophos Connect now integrates EntraID for Single Sign-On (SSO). This new feature for the VPN client, bundled with Sophos Firewall, is set to enhance both the security and user experience for SSL and IPsec VPN connections. The integration with EntraID (Azure AD) enables users to authenticate and leverage multi-factor authentication for both Sophos Connect and access to the user portal hosted by the firewall, streamlining secure access.

Further VPN-related enhancements include:

  • Improved user interface and usability: Connection types have been renamed for greater clarity, with “site-to-site” now referred to as “policy-based” and tunnel interfaces as “route-based,” making configurations more intuitive.
  • Dynamic validation of the IP address pool: For VPN connections (SSL VPN, IPsec, L2TP, and PPTP), the system now dynamically validates the allocated IP address pool, helping to better resolve potential IP address conflicts.
  • Strict profile enforcement: IPsec profiles now exclude default values to ensure algorithm synchronization, effectively eliminating potential fragmentation of session negotiation packets that could otherwise prevent site-to-site VPN tunnels from being established.
  • Route-based VPN and SD-RED scalability: The system has been optimized to support up to 3,000 simultaneously established tunnels. Specifically, Sophos Firewall solutions can now manage up to 1,000 SD-RED site-to-site tunnels and connect up to 650 concurrent SD-RED devices.

Additional management improvements enhance administrative flexibility and search capabilities:

  • More flexible DHCP Prefix Delegation (IPv6 DHCP-PD): The system now supports a broader range of prefixes, from /48 to /64, improving compatibility with various internet service providers.
  • Router Advertisement (RA) and DHCPv6 server: These features are now enabled by default, simplifying IPv6 network setup.
  • Resizable table columns: The web admin interface continues its adaptation for ultra-wide screens, with many configuration pages now allowing users to resize columns as needed for improved usability.
  • Enhanced object search functionality: The search field within the SD-WAN routing configuration screen now supports more granular criteria, including route name, ID, objects, and object values like IP addresses and domains. Similarly, local ACL rules now also support object name and value searches, extending to content-based searches for more precise results.
  • Default configuration changes: To streamline initial setups, default firewall rules and rule groups previously created during new firewall deployments have been removed. The initial configuration now only includes the default network rule and MTA rules. Furthermore, the default firewall rule group and the default gateway probe for custom gateways are now set to “None” by default.

Sophos continues its commitment to cybersecurity through a “Secure by Design” approach, enhancing the intrinsic security of its firewalls. This methodology involves the containerization of specific features and rigorous integrity checks on critical operating system files using mathematical checksums. Any detected checksum mismatch triggers a potential compromise alert, enabling monitoring teams to proactively identify possible security incidents affecting the firewall OS integrity. This proactive detection allows incident response and development teams to react swiftly to critical security events.

This update is now available for manual download and deployment by customers with any Sophos Firewall equipped with a valid license.

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Cyber Security

Honeywell Report Reveals 46% Quarterly Spike in Industrial Ransomware

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A new report from Honeywell reveals a significant escalation in cyber threats facing the industrial sector, with ransomware attacks surging by 46% from Q4 2024 to Q1 2025. The company’s 2025 Cybersecurity Threat Report indicates a widespread increase in both malware and ransomware activity, notably including a 3,000% spike in a specific trojan designed to steal credentials from industrial operators.

The allure of industrial targets for cybercriminals is clear, as explained by Paul Smith, director of Honeywell Operational Technology (OT) Cybersecurity Engineering and author of the report, “Industrial operations across critical sectors like energy and manufacturing must avoid unplanned downtime as much as possible – which is precisely why they are such attractive ransomware targets.” He further emphasized the agility of attackers, stating, “These attackers are evolving fast, leveraging ransomware-as-a-service kits to compromise the industrial operations that keep our economy moving.”

The urgency of these threats is underscored by definitions from the Cybersecurity and Infrastructure Security Agency (CISA) in the United States, which classifies incidents as “substantial” if they lead to unauthorized access causing significant operational downtime or impairment. Industry analyses corroborate the severe financial impact, showing that unplanned downtime—whether from cyberattacks or equipment failure—costs Fortune 500 companies approximately $1.5 trillion annually, representing a substantial 11% of their revenue.

To compile these critical findings, Honeywell’s researchers undertook an extensive analysis, reviewing over 250 billion logs, 79 million files, and blocking 4,600 incident events across the company’s global installed base. Their detailed examination yielded several concerning trends:

  • Ransomware’s Relentless Ascent: The first quarter of 2025 alone saw 2,472 potential ransomware attacks, already accounting for 40% of the entire annual total recorded in 2024, signaling a rapid acceleration of this threat.
  • Trojan Exploitation Targeting OT: A particularly dangerous trojan, identified as W32.Worm.Ramnit, was responsible for 37% of files blocked by Honeywell’s Secure Media Exchange (SMX). This figure represents an alarming 3,000% increase in this specific trojan compared to the preceding quarter, indicating a concerted effort to exploit industrial access.
  • Persistent USB-Based Risks: Despite awareness campaigns, external media continues to pose a significant threat. Honeywell’s SMX detected 1,826 unique USB threats in Q1 2025, with 124 of these being entirely new and previously unseen. This follows a 33% increase in USB malware detections in 2023 and an astounding 700% year-over-year surge in 2022, highlighting the enduring vulnerability posed by removable devices.

The scope of the report’s analysis also expanded to include threats introduced via other plug-in hardware, known as Human Interface Devices (HIDs). This encompasses commonly used items such as mice, mobile device charging cords, laptops, and various other peripherals, which are frequently connected to on-premise systems for software updates or patching, creating additional vectors for potential compromise.

In light of these escalating risks and evolving regulatory landscapes—such as new SEC reporting regulations requiring the disclosure of material cybersecurity incidents—industrial operators face increasing pressure to enhance their defenses. As Smith concluded, “Leveraging Zero Trust architecture and AI for security analysis can speed detection and enable smarter decision making and proactive defense in an increasingly complex digital landscape.” His recommendation underscores the need for decisive action and advanced security strategies to mitigate costly operational downtime and safety-related risks in the industrial environment.

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