Summary

We started to get reports about a new dropper for Sober.S worm at noon on October 6th, 2005. This dropper drops exactly the same Sober.S variant that started to spread early in the morning. When the dropper is run, it shows a messagebox as a decoy:



The description of Sober.S worm can be found here:

http://www.f-secure.com/v-descs/sober_s.shtml

Additional Details

The dropper for Sober.S worm is detected with the following F-Secure Anti-Virus updates:

Version=2005-10-06_03

Writeup: Alexey Podrezov; October 6th, 2005;