I found out on my pc a zip file with challenges for RE and I was trying to upload but I could not because zip files are not allowed… So I searched to find where I found the file and I come up with http://security.cs.rpi.edu/courses/binexp-spring2015/lectures/2/challenges.zip
Idk if they are the original owners but have fun RE-ing 
I’m redoing those challenges again with radare2 just for the purpose of learning the tool. (amazing tool btw)
Peace 
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For the fans of VirusTotal: https://virustotal.com/#/file/4b40b388d714cdd20c74008a2d7bfdbd5a3e596533644ef2c5e75092320262c9/detection