The MEMZ Trojan horse was created by Leurak for the "Viewer-Made Malware" video series by danooct1.
Leurak's channel, which includes various demos of his trojan: https://www.youtube.com/c/Leurak
danooct1's demo video: https://www.youtube.com/watch?v=I-jdSgjtUPk
MEMZ only runs on Windows XP or newer, but the deadliest payload, which is only 4 KB, can run off a floppy disk on pretty much any x86-compatible computer!
I got the disk image with the Nyan Cat from Leurak's MEMZ Corruption Pack, which you can download from here: https://drive.google.com/uc?export=download&id=0B9IxE8F2_n_ORGdCU1d3RWJBdzg
The disk image won't affect your hard drive. You can run it on a virtual machine or write it to a floppy disk. I don't know if you can burn it to a CD/DVD, I haven't tried it.
You can also write that IMG file to a USB drive using Win32DiskImager or dd, but it will wipe out the entire partition table (like the full MEMZ Trojan).
If you create a new partition, and then you try booting from that USB drive, the Nyan Cat will still show up. You have to create a new partition table (using Rufus on Windows, Disk Utility on Mac OS, or GParted on Linux), to fully remove the Nyan cat.
More frequent updates on Twitter: http://twitter.com/TCG96