On early May this year following the controversial uprooting of the 6-foot-tall bronze statue in downtown Tallinn, the capital of Estonia, the nation faced a series of massive botnet attacks. Estonian government, banking, media, and police sites were flooded by overwhelming internet traffic from all over the world which led to DDoS attacks forcing the sites to shut down and remain inaccessible outside the country for extended periods of time. In mid-May, the major botnet attacks suddenly stopped, and the bots appeared to have been set to run for exactly two weeks after which the infected computers abandoned the attacks and reverted to more traditional botnet activities, like spamming and extortion.
This recent attack on Estonia has proven the power of botnets and it DDoS capabilities. Using rented botnets, hundreds of thousands or even millions of infobombs may be launched at a target, all while maintaining total deniability to bring down a country's information infrastructure.
For more details on the botnet attack against Estonia, read full article here.
An article on how bots attack may also be accessed here.