The 2.54Tbps DDoS attack in 2017 was coordinated and planned over a period of six months, Google said.
Alongside these, critical infrastructure sectors such as oil and gas also come under heavy attacks from the internet.
Telegram was recently struck by a distributed denial of service (DDoS) attack.
"This is a warning to all wannabe DDOS-ers... we will identify you, bring you to court and facilitate that you will be held liable by the victims for the huge damage you cause".
DDoS attacks attempt to cripple machines or network resources by flooding them with requests from multiple IP addresses.
More than half of all IoT attacks originate from China and the U.S.
Internet Service Providers has registered a police complaint against Distributed Denial of Service (DDOS) attack by hackers in Mumbai.
The hacking team hit Pokemon Go's login servers with a distributed denial of service (DDoS) attack leaving some players frustrated as they were unable to log in to the game.
The BBC's online services, including its news website and iPlayer catch-up TV platform, were taken down for a few hours on Thursday by a large DDoS attack.
The Linux-based botnet has been known for over a year, however, it was only recently found attacking systems by compromising embedded devices like routers and then gaining SSH access.
The denial-of-service attack hit uscourts.gov, as well as other federal court websites around the US.
A group of 13 defendants who had been charged in a cyber attack on PayPal's website admitted to the December 2010 attack.
The attacks, which began in late 2011 and escalated this year have primarily been 'denial of service' campaigns.
The attack was in response to Samajwadi Party MP Ram Gopal Yadav demanding a ban on social networking websites.
Users worldwide reported significant down-time and slow service across both Twitter's website and mobile applications.
A DDos attack targeted the Russian embassy website.
It could be a sign that cyber police were making progress toward shutting down LulzSec.
Hackers briefly disabled three websites belonging to the Brazilian government.
The Internet vigilante group Anonymous denied responsibility for the Sony cyber-attack.
Sony blamed Internet vigilante group Anonymous for its data breach.