The Feliz trojan appeared on the 1st of January 2000. This trojan
is written in Delphi. Being run the trojan first outputs a dialog
with a picture and a single button:
When the button is clicked the trojan looks for C:\Windows\
directory and if it is found outputs the final messagebox:
At the same time the trojan deletes the following files:
Then the trojan passes control to the operating system. At this
time the operating system becomes unstable and it will no longer
start after next computer reboot.
If C:\Windows\ directory is not found by the trojan it will
output a number of messageboxes and pass control to operating
system without activating its payload.
[Analysis: Alexey Podrezov, F-Secure Corp.]