Jaschan lived in the village of Waffensen, Germany, and attended a computer science school in nearby Rotenburg.
He admitted to writing and releasing the two damaging worms when arrested by German police on 7 May 2004 after a three-month-long international investigation.
Following his arrest, Microsoft confirmed that they had received tip-offs from more than one source, and that the $250,000 reward for identifying the author of the NetSky worm would be shared between them.
A report by Sophos in August 2004 claimed that Jaschan's viruses were responsible for 70% of the infections seen in the first half of that year.
[3] In retaliation, the German security company Avira (formerly H+BEDV) officially halted its cooperation with Securepoint on 23 September 2004.