I am closing this thread now.
The analysis of related samples is done. With related I mean all samples that are actually downloading, dropping or creating each other. The relations are outlined, starting with the first part of the infection chain.
Most of the things that were posted in this thread recently don't seem to be related to IceRat except for the domain. Or there are other very loose connections like just the file name. Feel free to open a different thread for discussing speculations of that case.