DrDos Attack Definition

A DrDoS (Distributed Reflection Denial of Service) attack is a type of DDoS cyberattack that uses publicly reachable servers to flood a target with unwanted traffic. The attacker sends requests that appear to come from the victim’s IP address, so the servers reply to the victim instead. In many cases, the replies are larger than the requests, which amplifies the traffic and can slow down or disrupt the target’s service.

How a DrDoS Attack Works

An attacker begins by sending spoofed requests to publicly accessible services, using the victim’s IP address as the source address. The services then reply to the victim, not the attacker. Attackers often choose services that can turn small requests into much larger responses, which increases the amount of traffic sent toward the target. 

When many reflectors (third-party servers that respond to the attacker’s spoofed requests) respond at once, the victim’s network or server can become overloaded. This can lead to slowdowns, dropped connections, or downtime.

Common Types of DrDoS Attacks

• DNS amplification attack: An attacker sends small DNS queries that trigger much larger responses, which then flood the target.
• NTP amplification attack: This attack abuses time servers that reply with large amounts of data, overwhelming the victim.
• Memcached amplification attack: Misconfigured memcached servers return huge data responses that quickly overload the target.
• SSDP amplification attack: Exposed UPnP-enabled devices respond to spoofed discovery requests, sending traffic back to the victim.
• SNMP amplification attack: Network management servers are used to generate amplified traffic that overwhelms the target.

DrDoS vs DDoS

A DDoS (Distributed Denial of Service) attack overwhelms a target with traffic from multiple sources, often compromised devices in a botnet. A DrDoS (Distributed Reflection Denial of Service) attack is a reflection-based version that uses spoofed requests to make legitimate servers send traffic to the victim.

The key difference is the traffic path. Many DDoS attacks send traffic directly from attacker-controlled systems, while DrDoS attacks route traffic through third-party reflectors used without their knowledge.

How to Prevent a DrDoS Attack

• Use DDoS protection services to detect and block malicious traffic before it reaches the network.
• Filter and rate-limit incoming requests to help prevent traffic spikes from overwhelming systems.
• Use anti-spoofing controls like source address validation, ingress filtering, and similar rules to help stop spoofed traffic from leaving a network.
• Disable unnecessary services and unused protocols to reduce the number of systems attackers can exploit.
• Secure and update servers to help prevent misuse of infrastructure.
• Use firewalls and monitoring tools as these systems detect unusual activity early and help stop attacks faster.

Read More

• What Is a DHCP Attack?
• What Is a Dictionary Attack?
• What Is a DNS Reflection Attack?

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