What is "vulcanbot"

Vulcanbot is the name of a botnet predominantly spread in Vietnam. The botnet began to spread after the website of the Vietnamese Professionals Society (vps.org) was hacked and the legitimate Vietnamese keyboard driver ( VPSKeys) hosted on the site was replaced with a backdoored version. Google posted on its blog that it believed the botnet thus created was used predominantly to DDoS bloggers critical of the bauxite mining in Vietnam, thus making it a politically motivated attack.