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KrebsOnSecurity Hit With Near-Record 6.3 Tbps DDoS

  • KrebsOnSecurity experienced a DDoS attack exceeding 6.3 terabits per second last week, lasting about 45 seconds and hitting online servers.
  • The attack appears to be a test run by the Aisuru IoT botnet, a recently surfaced threat linked to a DDoS-for-hire service operated by a Brazilian named Forky.
  • The attack unleashed roughly 585 million large UDP packets per second against random ports, making it about ten times larger than the 2016 Mirai botnet attack.
  • Google Security Engineer Damian Menscher confirmed this as the largest attack Google has mitigated and said similar recent attacks were likely tests of the same botnet.
  • Although the attack caused no visible disruption due to its brevity, it demonstrates the destructive power of large IoT botnets despite multiple law enforcement domain seizures.
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A new botnet is preparing to take on Mirai's legacy – only a lot stronger. A security expert has been attacked with 6.3 terabit per second.

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The article describes the causes and impacts of network error code 521, pointing out that the error is usually caused by a connection problem between Cloudflare and the target server and may cause the website to be inaccessible.

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krebsonsecurity.com broke the news in on Tuesday, May 20, 2025.
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