Sub7

Sub7, or SubSeven or Sub7Server, is a Trojan horse - more specifically a Remote Trojan Horse - program originally released in February 1999.

Because its typical use is to allow undetected and unauthorized access, Sub7 is usually described as a trojan horse by security experts. Starting with version 2.1 (1999) it could be controlled via IRC. As one security book phrased it: "This set the stage for all malicious botnets to come." Additionally Sub7 has some features deemed of little use in legitimate remote administration like keystroke logging.