Editing Denial-of-service attack (section)

===DDoS extortion===
In 2015, DDoS botnets such as DD4BC grew in prominence, taking aim at financial institutions.<ref>{{cite news|title=Who's Behind DDoS Attacks and How Can You Protect Your Website?|url=http://blog.cloudbric.com/2015/09/whos-behind-ddos-attacks-and-how-can.html|access-date=15 September 2015|agency=Cloudbric|date=10 September 2015}}</ref> Cyber-extortionists typically begin with a low-level attack and a warning that a larger attack will be carried out if a ransom is not paid in [[bitcoin]].<ref>{{cite news|last1=Solon|first1=Olivia|title=Cyber-Extortionists Targeting the Financial Sector Are Demanding Bitcoin Ransoms|url=https://www.bloomberg.com/news/articles/2015-09-09/bitcoin-ddos-ransom-demands-raise-dd4bc-profile?mod=djemRiskCompliance|access-date=15 September 2015|agency=Bloomberg|date=9 September 2015}}</ref> Security experts recommend targeted websites to not pay the ransom. The attackers tend to get into an extended extortion scheme once they recognize that the target is ready to pay.<ref>{{cite news|last1=Greenberg|first1=Adam|title=Akamai warns of increased activity from DDoS extortion group|url=http://www.scmagazineuk.com/akamai-warns-of-increased-activity-from-ddos-extortion-group/article/438333/|access-date=15 September 2015|agency=SC Magazine|date=14 September 2015}}</ref>