While DDoS attacks are volumetric in nature and can be detected by the abnormally high rates of incoming traffic fluctuations, the low-and-slowВ RUDY attack isВ hard to detect and appear to be legitimate traffic. The secure proxy is effective as it does not forward the partial connection requests, thus making the DoS attack useless. This means all requests are inspected in real-time en-route to the clientsвЂ™ servers. Solutions like Imperva are more effective and less complex in mitigating low and slow DoS attacks,В RUDY attacks and such as they use reverse proxy technology. The solution simulates the requirements of an application stack resource without a direct server connection to identify misuse and detect and mitigate such attacks. In this method used by legacy mitigation solutions, the CPU usage, server memory application threads, and connection tables etc., are scanned for stuck application processes, abuse of resources, and idle open network connections staying open for long intervals.ДЄnother effective tool is to use behaviour analysis of the open server connections.

Methods of mitigation involve close server resource monitoring, which can reveal a low and slow attack,В RUDY attacks etc. Thus if the sockets attacked time out, it reinitiates the connection and continues to max out the resources of the webserver until it is mitigated. When unmitigated and undetected, such Slowloris attacks last for long periods of time. The sophisticated and appearing legitimate RUDY tool can automatically detect the target serverвЂ™s web forms, choose which fields in the form to attack, and, if available on the target server, use the support of cookie-based session persistence and SOCKS proxies. Eventually, the attack causes the targeted serverвЂ™s connection table to run slow and get exhausted, leading the server to crash. Thus RUDY creates a huge backlog of application threads since the вЂcontent-lengthвЂ™ field is long and prevents the receiving server from automatically closing the connection. Technology advancements have helped the variants ofВ RUDY attacks to use randomized time intervals in a bid to avoid detection. Since the information relayed is in small chunks and at a very slow rate of approximately 10-second intervals between bytes, it is called a low and slowВ RUDY DDOSВ attack. It then proceeds to inject the information onto the form using tiny data volume packets of one byte-size at a time. Once identified,В RUDY attackВ will send the server a legitimate request via HTTP POST, which contains an abnormally long header-field content-length. The DoS tool browses the website targeted to detect its embedded web forms. RUDY attacks are of the low and slow attack-type of tools used to make a targeted server or web server crash by submitting long form-fields in low volumes continued to appear as legitimate traffic. Let us start withВ what does RUDY mean.В ThisВ DDoS website toolВ is often misused to execute slow-rate attacks (like DDoS attacks by Slowloris) and uses long form-field submissions for its implementation and execution.В What is RUDY short for? The longer form is (r u dead yet/ R-U-Dead-Yet) and is named after the Finish album R.U.D.Y., of the Children of Bodom, which is a melodic death metal band. Thus the traffic of low and slow attempts, which appear legitimate, make the server targeted unavailable to legitimate traffic and escape detection by the traditional mitigation tools.

The connections and sessions are left open for as long as possible, causing the targetвЂ™s resources to get expended and eventually to get overwhelmed. Layer-7 DDoS attacks, which are slow rate and hence known as вЂњlow and slowвЂќ DDoS attacks, tend to attempt opening relatively fewer connections to the server targeted or the target web site.

Slowloris attack mitigation