Distributed Denial of Service (DDoS): When Traffic Becomes a Weapon

A Distributed Denial of Service (DDoS) attack is a direct assault on availability, designed to overwhelm a target’s resources—bandwidth, processing power, or application capacity by flooding it with massive amounts of malicious traffic from thousands of geographically diverse, compromised systems (a botnet). Microsoft Azure was recently hit by a 15 Tbps DDoS attack that used 500,000 IP addresses.

Why It Matters: The High Cost of Downtime

1. Financial Impact: For organizations providing 24/7 online services, a DDoS attack causes immediate, costly outages and irreparable reputational damage.
2. The Smokescreen Tactic: Increasingly, DDoS attacks are used as a distraction while sophisticated threat actors use the opportunity to execute a highly targeted, covert attack, such as injecting malware or exfiltrating data.

Types of DDoS Attacks

1. Volumetric Attacks: this consumes available network bandwidth, e.g. UDP/ICMP floods
2. Protocol Attacks: These exploit weaknesses in network protocols, consuming memory and CPU resources (E.g. SYN floods)
3. Application Layer Attacks: This exploits application layer vulnerabilities.

Strategic Mitigation: A Defense-in-Depth Approach

1. DDoS Mitigation Services: Utilise enterprise-grade, always-on protection (e.g., Cloudflare, Akamai, AWS Shield Advanced). These operate at the edge, absorbing attacks before they reach your network.

2. Web Application Firewalls (WAF): Deploy a WAF to inspect Layer 7 traffic and filter out malicious requests targeting your application logic.

3. Load Balancing and Autoscaling: Ensure applications are configured for horizontal scaling to handle sudden demand spikes. Managing these configurations can be complex. Our Cloud Platform Operations (CPO) team helps take the hassle out of managing your AWS environment, ensuring your cloud infrastructure is always optimized and ready to scale.

4. Response Planning & Monitoring: Develop a specific Incident Response (IR) playbook and maintain constant visibility over your traffic.

5. Infrastructure Stress Testing: Conduct simulated DDoS attacks to understand your true capacity limits and identify points of failure under stress.