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DDoS Attacks in Q4 2018

DDoS Attacks in Q4 2018News overview In Q4 2018, security researchers detected a number of new botnets, which included not only Mirai clones for a change. The fall saw increased activity on the part of the Chalubo bot, whose first attacks were registered in late August. Although the new malware employs snippets of Mirai code …

  • 07 Feb 2019
10 min read
DDoS Attacks in Q4 2018
News overview In Q4 2018, security researchers detected a number of new botnets, which included not only Mirai clones for a change. The fall saw increased activity on the part of the Chalubo bot, whose first attacks were registered in late August. Although the new malware employs snippets of Mirai code and the same persistence techniques as in the Xor.DDoS bot family, Chalubo is mostly a fresh product designed solely for DDoS attacks (for example, one of the detected samples was a SYN flood one). In October, Chalubo began to be seen more often in the wild; researchers detected versions created for different architectures (32- and 64-bit ARM, x86, x86_64, MIPS, MIPSEL, PowerPC), which strongly suggests that the test period is over. Also in October, details were released of the new Torii botnet, which Avast experts detected a month earlier. The botnet is aimed at a wide range of IoT devices and architectures. Its code differs significantly from Mirai — the malware is better hidden with a higher level of persistence, and thus promises to be far more dangerous. The malware collects and sends detailed information about infected devices to its C&C server, including host name and process ID, but for what purpose remains unclear. No DDoS attacks based on Torii botnets were detected, but experts believe that it’s still early days. Another bot from last quarter, nicknamed DemonBot, caught the eye for hijacking Hadoop clusters through a vulnerability in the execution of YARN remote commands. This bot is not very complex technically, but dangerous in its choice of target: Hadoop clusters pack a major punch in terms of computing power because they are designed to handle Big Data. What’s more, being cloud-integrated, they can significantly boost DDoS attacks. Radware is currently monitoring 70 active servers that carry out up to 1 million infections per day. DemonBot is compatible not only with Hadoop clusters, but with most IoT devices, which makes it easy to re-aim at more numerous targets. Last quarter, experts warned not only about new botnets, but new attack mechanisms, too. At the beginning of winter, for instance, it turned out that FragmentSmack was more widely deployable than previously thought. This attack exploits a vulnerability in the IP stack, which enables defective packets to be sent disguised as fragments of a larger message. The resource under attack tries to gather these packets into one, or places them in an endless queue, which takes up all its computational power and renders it incapable of handling legitimate requests. FragmentSmack was believed to be a threat only to Linux systems, but in December researchers from Finland discovered that it works fine with Windows 7, 8.1, 10, Windows Server, and 90 Cisco products. Another promising attack method uses the CoAP protocol approved for widespread application in 2014. It is designed to facilitate communication between devices with a small amount of memory, making it ideal for the IoT. Since CoAP is based on the UDP protocol, it has inherited all the latter’s defects, which means
Source: Securelist – Kaspersky Lab’s cyberthreat research and reportsPublished on 2019-02-07
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  • 07 Feb 2019

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