Doing so will allow staff to better identify the type of attack, the point of attack, and the attack vector used. Understand your current environment, and have a baseline of the daily volume, type, and performance of network traffic.They will help you determine actions and priorities as the attack progresses. Have current network diagrams, IT infrastructure details, and asset inventories.Also, ensure that critical systems have sufficient capacity to withstand a DDoS attack. Services should be prioritized beforehand to identify what resources can be turned off or blocked as needed to limit the effects of the attack. Identify critical services that must be maintained during an attack, as well as their priority.Maintain contact information for firewall teams, IDS teams, and network teams, and ensure that it is current and readily available.Ensure that your staff is aware of the provisions of your service level agreement (SLA). The ISP or hosting provider may provide DDoS mitigation services.
Identify who should be contacted during a DDoS, what processes should be followed, what information is needed, and what actions will be taken during the attack with each entity. One critical item in a checklist or SOP is having contact information for your ISP and hosting providers. Develop a checklist or standard operating procedure (SOP) to follow in the event of a DDoS attack.In general, the best practice defense for mitigating DDoS attacks involves advanced preparation: ImpactĪ number of mitigation strategies are available for dealing with DDoS attacks, depending on the type of attack and the target network infrastructure. US-CERT is continuing research efforts and will provide additional data as it becomes available. Target selection, timing, and other attack activity is often coordinated through social media sites or online forums. The packets contained a message followed by variable amounts of padding, for exampleĦ6:6c:6f:6f:64:00:00:00:00:00:00:00:00:00 | flood. Prior to January 20, 2012, US-CERT observed additional DDoS attacks that consisted of UDP packets on ports 25 and 80. The "msg" field can be arbitrarily set by the attacker. "hxxp://The HTTP requests contained an "id" value based on UNIX time and a user-defined "msg" value, for example Please do not visit any of the links because they may still host functioning LOIC or other malicious code. The following sites have been identified in HTTP referrer headers of suspected LOIC traffic.
The following is a sample of LOIC traffic recorded in a web server log: A binary variant of LOIC includes the ability to join a botnet to allow nodes to be controlled via IRC or RSS command channels (the "HiveMind" feature). An attacker can access this variant of LOIC on a website and select targets, specify an optional message, throttle attack traffic, and monitor attack progress. One variant is written in JavaScript and designed to be used from a web browser. US-CERT has reviewed at least two implementations of LOIC. Low Orbit Ion Cannon (LOIC) is a DoS-attack tool associated with previous Anonymous activity. US-CERT has evidence of two types of DDoS attacks: one using HTTP GET requests and another using a simple UDP flood.
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