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TESO was a famous hacker group, which originated in Austria and quickly became international. It was active from 1998 to 2004, and during its peak around 2000, it was responsible for a significant share of the exploits on the bugtraq mailing list.


In 1998, Teso was founded, and quickly grew to 6 people, which first met in 1999 at the CCC Camp near Berlin.

By 2000, the group was at its peak, and started speaking on various conferences, wrote articles for Phrack and released security tools and exploits at a very high pace. Some of its exploits only became known after leaking to the community. This included exploits for wu-ftp, apache and openssh.

2001 Comprehensive by scut

2002 First remote vulnerability in OpenBSD followed by a series of remote exploits against OpenBSD (some co-authored with ADM). Forced OpenBSD to remove the claim from the OpenBSD webpage "7 years without vulnerability".

In 2003, the group informally disbanded, and in 2004 the website went down.


  • In 2000, developed hellkit, the first shellcode generator.
  • In 2000, wrote TesoGCC, the first format string vulnerability scanner, and the first comprehensive guide on format string exploitation.
  • BurnEye is widely believed to be one of the first proper ELF executable crypters.
  • Broke OpenBSD's "7 years without a remote vulnerability in the default install" record.


Members and name

The name originally was an acronym of the nicknames of the original...
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