I am happy to announce that we have a winner for the reverse engineering challenge: Among the submitters, Marion Marschalek's report stood out - both in terms of technical depth, but also in regards to the structure and readability of the report. Remarkably, this is Marion's first reverse engineering project. :-)
At the same time, I would like to say "Thank you" to everyone who submitted - I will make time in the next few weeks to send emails with more detailed feedback for each submission. It was great to see that this contest encouraged a number of first-time analysts to tackle a relatively thorny piece of malware.