At least one massive DDoS attack was the result of an accident due to developer error. DDoS attacks were aimed at targets in 84 countries, down from 98 in Q3. China was the most-hammered country at 51.84 percent, with the U.S. as the second most favored target, followed by South Korea. Long attacks are declining somewhat, but micro-attacks, which last no more than four hours, rose slightly. The longest attack observed by Kaspersky in Q4 lasted three days, or 146 hours.”]
Source: https://www.csoonline.com/article/3253342/kaspersky-accidental-ddos-attacks-among-top-threats.html