There have been significant shifts in DDoS attack patterns in the first half of 2020, a Neustar report reveals. There has been a 151% increase in the number of DDoS attacks compared to the same period in 2019. These included the largest and longest attacks that Neustar has ever mitigated at 1.17 Terabits-per-second (Tbps) and 5 days and 18 hours respectively.
These figures are representative of the growing number, volume and intensity of network-type cyberattacks as organizations shifted to remote operations and workers’ reliance on the internet increased.
DDoS attacks becoming increasingly intense and sophisticated
Large DDoS attacks are bigger, more intense, and happening in greater numbers than ever before. There has been a noticeable spike in large attacks across the industry, most notably the 2.3 Tbps attack targeting an Amazon Web Services client in February – the largest volumetric DDoS attack on record.
The total number of attacks increased by over two and a half times during January through June of 2020 compared to the same period in 2019. The increase was felt across all size categories, with the biggest growth happening at opposite ends of the scale – the number of attacks sized 100 Gbps and above grew a whopping 275% and the number of very small attacks, sized 5 Gbps and below, increased by more than 200%.
Overall, small attacks sized 5 Gbps and below represented 70% of all attacks mitigated between January and June of 2020.
“While large volumetric attacks capture attention and headlines, bad actors increasingly recognise the value of striking at low enough volume to bypass the traffic thresholds that would trigger mitigation to degrade performance or precision target vulnerable infrastructure like a VPN,” said Michael Kaczmarek, Neustar VP of Security Products.
“These shifts put every organization with an internet presence at risk of a DDoS attack – a threat that is particularly critical with global workforces reliant on VPNs for remote login. VPN servers are often left vulnerable, making it simple for cybercriminals to take an entire workforce offline with a targeted DDoS attack.”
The rise in smaller DDoS attacks has been matched by increases in attack sophistication and intensity. 52% of threats mitigated by Neustar leveraged three vectors or more, with the number of attacks featuring a single vector essentially nonexistent.
New amplification methods and attacks of higher intensity targeted at critical pieces of web infrastructure were also tracked. The previous high-water mark of 500 millions-of-packets-per-second (Mpps) was topped this year, with an attack of over 800 Mpps recorded.
“The dependency and growth in online communications since COVID-19 has fundamentally changed what organizations must do to succeed,” said Brian McCann, President, Neustar Security Solutions.
“There is no one-size-fits-all solution for security, but having a reliable cloud service that ensures availability and security for all services and users has proven to be a critical difference between barely surviving and thriving in this rapidly changing environment.”
Ongoing impact of COVID-19 on cyberthreats and industry web traffic
The precipitous rise in DDoS attacks mirrors the growth in internet traffic seen during the pandemic. Internet use is up between 50% and 70% and streaming media rose more than 12% in the first quarter of 2020. This has meant that attackers of all types, whether serious cybercriminals or bored teenagers stuck at home, have had more screen time to be disruptive.
In a study of one of the largest cybercrime sites by Cambridge University’s Cybercrime Centre, they found that the number of attacks enacted by the website went up sharply at the start of the pandemic and associated lockdown. They also found that instead of existing cybercriminals staging more attacks, it was new attackers driving the increase in DDoS attacks.
The corresponding attacks, like internet traffic, have not been evenly spread across all websites. It’s well known that ecommerce and gaming websites have received a lot of negative attention from hackers, but there are other industries that have been hit hard by cybercriminals over the last six months.
Healthcare organizations contain sensitive patient information and a growing number of IoT devices that are easily exploited. Combined with the additional pressure of the pandemic, hospitals have become some of the most desirable targets for cybercriminals.
Industries that have seen a lot of growth during the pandemic, like online gambling, have also been ripe for cyberthreats. Most notably, online video has seen an incredible rise in both usage and DDoS attacks.
Omdia has reported an additional 200 billion hours of Netflix viewing or Zoom video calls over initial 2020 forecasts. Where traffic rises, so too do attacks; Neustar attack mitigations for this vertical increased by 461% over the last six months.
“While 2020 has brought radical changes in behaviour to consumers and criminals alike, it is naïve to assume that actions of either audience will revert completely to pre-pandemic norms after this crisis passes,” added Kaczmarek.
“Mitigating these increasingly sophisticated DDoS attacks will continue to be a necessary part of doing business online. At a time when many organizations could do with less worry, fully managed services can take the pressure off and ensure critical digital assets are safe and secure.”
The report highlights several emerging attacker tactics seen across the industry, including an increase in burst and pulse DDoS attacks, broadening abuse of built-in network protocols such as ARMS, WS-DD, CoAP and Jenkins to launch DDoS amplification attacks that can be carried out with limited resources and cause significant disruptions, NXNS attacks targeting DNS servers, RangeAmp attacks targeting Content Delivery Networks (CDNs), and a resurgence of Mirai-like malware capable of building large botnets through the exploitation of poorly secured IoT devices.