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Text of the page (random words):
ice attacks are characterized by an explicit attempt by attackers to prevent legitimate use of a service there are two general forms of dos attacks those that crash services and those that flood services the most serious attacks are distributed 31 distributed dos edit a distributed denial of service ddos attack occurs when multiple systems flood the bandwidth or resources of a targeted system usually one or more web servers 31 a ddos attack uses more than one unique ip address or machine often from thousands of hosts infected with malware 32 33 a distributed denial of service attack typically involves more than around 3 5 nodes on different networks fewer nodes may qualify as a dos attack but is not a ddos attack 34 35 most of the time attackers operate from an endpoint that is not their intended target for example using another user s machine to attack a server by using another unsuspecting endpoint if it becomes compromised they can then move onto another workstation within the enterprise network 36 however even faking lots of users and executing a dos attack a single attacker with few computers is still very limited in the amount of traffic they can generate 37 if the attacks are from multiple sources it can be difficult for the host to identify and stop them 38 the scale of ddos attacks has continued to rise over recent years by 2016 exceeding a terabit per second 39 40 some common examples of ddos attacks are udp flooding syn flooding and dns amplification 41 42 yo yo attack edit a yo yo attack is a specific type of dos ddos aimed at cloud hosted applications which use autoscaling 43 44 45 during the attack an attacker repeatedly changes between sending a lot of traffic which causes a scale up and stopping the burst causing a scale down as a result 46 application layer attacks edit an application layer ddos attack sometimes referred to as layer 7 ddos attack is a form of ddos attack where attackers target application layer processes 47 34 the attack over exercises specific functions or features of a website with the intention to disable those functions or features this application layer attack is different from an entire network attack and is often used against financial institutions to distract it and security personnel from security breaches 48 in 2013 application layer ddos attacks represented 20 of all ddos attacks 49 according to research by akamai technologies there have been 51 percent more application layer attacks from q4 2013 to q4 2014 and 16 percent more from q3 2014 to q4 2014 50 in november 2017 junade ali an engineer at cloudflare noted that whilst network level attacks continue to be of high capacity they were occurring less frequently ali further noted that although network level attacks were becoming less frequent data from cloudflare demonstrated that application layer attacks were still showing no sign of slowing down 51 method of attack edit the simplest dos attack relies primarily on brute force flooding the target with an overwhelming flux of packets oversaturating its connection bandwidth or depleting the target s system resources bandwidth saturating floods rely on the attacker s ability to generate the overwhelming flux of packets a common way of achieving this today is via distributed denial of service employing a botnet an application layer ddos attack is done mainly for specific targeted purposes including disrupting transactions and access to databases it requires fewer resources than network layer attacks but often accompanies them 52 an attack may be disguised to look like legitimate traffic except it targets specific application packets or functions the attack on the application layer can disrupt services such as the retrieval of information or search functions on a website 49 advanced persistent dos edit an advanced persistent dos apdos is associated with an advanced persistent threat and requires specialized ddos mitigation 53 these attacks can persist for weeks the longest continuous period noted so far lasted 38 days this attack involved approximately 50 petabits 50 000 terabits of malicious traffic 54 attackers in this scenario may tactically switch between several targets to create a diversion to evade defensive ddos countermeasures but all the while eventually concentrating the main thrust of the attack onto a single victim in this scenario attackers with continuous access to several very powerful network resources are capable of sustaining a prolonged campaign generating enormous levels of unamplified ddos traffic apdos attacks are characterized by advanced reconnaissance pre attack osint and extensive decoyed scanning crafted to evade detection over long periods tactical execution attack with both primary and secondary victims but the focus is on primary explicit motivation a calculated end game goal target large computing capacity access to substantial computer power and network bandwidth simultaneous multi threaded osi layer attacks sophisticated tools operating at layers 3 through 7 persistence over extended periods combining all the above into a concerted well managed attack across a range of targets 55 denial of service as a service edit main article stresser some vendors provide so called booter or stresser services which have simple web based front ends and accept payment over the web marketed and promoted as stress testing tools they can be used to perform unauthorized denial of service attacks and allow technically unsophisticated attackers access to sophisticated attack tools 56 usually powered by a botnet the traffic produced by a consumer stresser can range anywhere from 5 50 gbit s which can in most cases deny the average home user internet access 57 markov modulated denial of service attack edit a markov modulated denial of service attack occurs when the attacker disrupts control packets using a hidden markov model a setting in which markov model based attacks are prevalent is online gaming as the disruption of the control packet undermines gameplay and system functionality 58 symptoms edit the united states computer emergency readiness team us cert has identified symptoms of a denial of service attack to include 59 unusually slow network performance opening files or accessing websites unavailability of a particular website or inability to access any website attack techniques edit this section needs more citations please help improve this section by adding citations to reliable sources unsourced material may be challenged and removed find sources denial of service attack news newspapers books scholar jstor february 2024 learn how and when to remove this message attack tools edit in cases such as mydoom and slowloris the tools are embedded in malware and launch their attacks without the knowledge of the system owner stacheldraht is a classic example of a ddos tool it uses a layered structure where the attacker uses a client program to connect to handlers which are compromised systems that issue commands to the zombie agents which in turn facilitate the ddos attack agents are compromised via the handlers by the attacker using automated routines to exploit vulnerabilities in programs that accept remote connections running on the targeted remote hosts each handler can control up to a thousand agents 60 in other cases a machine may become part of a ddos attack with the owner s consent for example in operation payback organized by the group anonymous the low orbit ion cannon has typically been used in this way along with high orbit ion cannon a wide variety of ddos tools are available today including paid and free versions with different features available there is an underground market for these in hacker related forums and irc channels application layer attacks edit application layer attacks employ dos causing exploits and can cause server running software to fill the disk space or consume all available memory or cpu time attacks may use specific packet types or connection requests to saturate finite resources by for example occupying the maximum number of open connections or filling the victim s disk space with logs an attacker with shell level access to a victim s computer may slow it until it is unusable or crash it by using a fork bomb another kind of application level dos attack is xdos or xml dos which can be controlled by modern web application firewalls wafs all attacks belonging to the category of timeout exploiting 61 slow dos attacks implement an application layer attack examples of threats are slowloris establishing pending connections with the victim or slowdroid an attack running on mobile devices another target of ddos attacks may be to produce added costs for the application operator when the latter uses resources based on cloud computing in this case normally application used resources are tied to a needed quality of service qos level e g responses should be less than 200 ms and this rule is usually linked to automated software e g amazon cloudwatch 62 to raise more virtual resources from the provider to meet the defined qos levels for the increased requests the main incentive behind such attacks may be to drive the application owner to raise the elasticity levels to handle the increased application traffic to cause financial losses or force them to become less competitive a banana attack is another particular type of dos it involves redirecting outgoing messages from the client back onto the client preventing outside access as well as flooding the client with the sent packets a land attack is of this type degradation of service attacks edit pulsing zombies are compromised computers that are directed to launch intermittent and short lived flooding of victim websites with the intent of merely slowing it rather than crashing it this type of attack referred to as degradation of service can be more difficult to detect and can disrupt and hamper connection to websites for prolonged periods of time potentially causing more overall disruption than a denial of service attack 63 64 exposure of degradation of service attacks is complicated further by the matter of discerning whether the server is really being attacked or is experiencing higher than normal legitimate traffic loads 65 distributed dos attack edit if an attacker mounts an attack from a single host it would be classified as a dos attack any attack against availability would be classed as a denial of service attack on the other hand if an attacker uses many systems to simultaneously launch attacks against a remote host this would be classified as a ddos attack malware can carry ddos attack mechanisms one of the better known examples of this was mydoom its dos mechanism was triggered on a specific date and time this type of ddos involved hardcoding the target ip address before releasing the malware and no further interaction was necessary to launch the attack a system may also be compromised with a trojan containing a zombie agent attackers can also break into systems using automated tools that exploit flaws in programs that listen for connections from remote hosts this scenario primarily concerns systems acting as servers on the web stacheldraht is a classic example of a ddos tool it uses a layered structure where the attacker uses a client program to connect to handlers which are compromised systems that issue commands to the zombie agents which in turn facilitate the ddos attack agents are compromised via the handlers by the attacker each handler can control up to a thousand agents 60 in some cases a machine may become part of a ddos attack with the owner s consent for example in operation payback organized by the group anonymous these attacks can use different types of internet packets such as tcp udp icmp etc these collections of compromised systems are known as botnets ddos tools like stacheldraht still use classic dos attack methods centered on ip spoofing and amplification like smurf attacks and fraggle attacks types of bandwidth consumption attacks syn floods a resource starvation attack may also be used newer tools can use dns servers for dos purposes unlike mydoom s ddos mechanism botnets can be turned against any ip address script kiddies use them to deny the availability of well known websites to legitimate users 66 more sophisticated attackers use ddos tools for the purposes of extortion including against their business rivals 67 it has been reported that there are new attacks from internet of things iot devices that have been involved in denial of service attacks 68 one such attack peaked at around 20 000 requests per second it came from around 900 cctv cameras 69 uk s gchq has tools built for ddos named predators face and rolling thunder 70 simple attacks such as syn floods may appear with a wide range of source ip addresses giving the appearance of a distributed dos these flood attacks do not require completion of the tcp three way handshake and attempt to exhaust the destination syn queue or the server bandwidth because the source ip addresses can be trivially spoofed an attack could come from a limited set of sources or may even originate from a single host stack enhancements such as syn cookies may be effective mitigation against syn queue flooding but do not address bandwidth exhaustion in 2022 tcp attacks were the leading method in ddos incidents accounting for 63 of all ddos activity this includes tactics like tcp syn tcp ack and tcp floods with tcp being the most widespread networking protocol its attacks are expected to remain prevalent in the ddos threat scene 16 ddos extortion edit in 2015 ddos botnets such as dd4bc grew in prominence taking aim at financial institutions 71 cyber extortionists typically begin with a low level attack and a warning that a larger attack will be carried out if a ransom is not paid in bitcoin 72 security experts recommend targeted websites to not pay the ransom the attackers tend to get into an extended extortion scheme once they recognize that the target is ready to pay 73 http slow post dos attack edit first discovered in 2009 the http slow post attack sends a complete legitimate http post header which includes a content length field to specify the size of the message body to follow however the attacker then proceeds to send the actual message body at an extremely slow rate e g 1 byte 110 seconds due to the entire message being correct and complete the target server will attempt to obey the content length field in the header and wait for the entire body of the message to be transmitted which can take a very long time the attacker establishes hundreds or even thousands of such connections until all resources for incoming connections on the victim server are exhausted making any further connections impossible until all data has been sent it is notable that unlike many other dos or ddos attacks which try to subdue the server by overloading its network or cpu an http slow post attack targets the logical resources of the victim which me...
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