» This article is about a hacker group. For the Ugandan ethnic group, see Teso:For the ferryboat service to the Dutch island of Texel, see Royal TESO TESO was a famous hacker group, which originated in Austria and quickly became international. They were active from 1998 to 2004, and during their peak around 2000, they were responsible for a significant share of the exploits on the bugtraq mailinglist. Name The name originally was an acronym of the nicknames of the original founders, but as ma… (More on Teso)