The TCP and UDP modes send message strings and packets to select ports on the target, while the HTTP flood mode sends an endless volley of GET requests. Once launched, LOIC opens multiple connection requests for a target server. It then sends a continuous series of messages until the server becomes overloaded and can’t respond to legitimate requests.What is your pet’s name? (Identity check failed) So how do you flush out a T-1000? How do you tell a browser-based bot from a real person using a real browser? Some common bot filtering methods, which usually rely on sets of Progressive Challenges, are absolutely useless against bots that can retain cookies and execute JavaScripts. ![]() The alternative of indiscriminately flashing CAPTCHA’s for anyone with a browser is nothing less than a self-inflicted disaster – especially when the attacks can go on for weeks at a time. To demonstrate how these attacks can be stopped, here’s a case study of an actual DDoS event involving such browsers an attack which employed a swarm of human-like bots which would – under most circumstances – result in a complete and total disaster. The attack was executed by an unidentified botnet, which employed browser-based bots that were able to retain cookies and execute JavaScript. Early in the attack they were identified as PhantomJS headless-browsers. PhantomJS is a development tool that uses a bare-bone (or “headless”) browser, providing its users with full browsing capabilities but no user interface, no buttons, no address bar, etc. ![]() PhantomJS’s can be used for automation and load monitoring. The attack lasted for over 150 hours, during which we recorded malicious visits from over 180,000 attacking IPs worldwide. In term of volumes, the attack peaked at 6,000 hits/second for an average of +690,000,000 hits a day. More than one Botnet? | View Hi-res version The number of attacking IPs, as well as their geographical variety, led us to believe that this might have been a coordinated effort, involving more than one botnet at a time.
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