That's the message that hundreds of thousands of computer users have been reading since last Friday as the WanaCrypt0r 2.0 ransomware (a version of WannaCry) spent the weekend spreading like wildfire around the world. It's crippled Britain's NHS, and its makers have so far hauled in more than $50,000 in paid ransoms.But what does it actually look like? A video produced by YouTube malware historian danooct1 shows us.Running a virtual machine, absolutely definitely not connected to any network, danooct1 opens up a range of test documents, including images, before running the WannaCry malware. The malware then changes the background on the virtual machine's desktop, locks all of test files, and leaves a handy text document explaining to the user how to go about obtaining bitcoin to decrypt the files."WannaCry has been really interesting because it combines some aspects of worms like Sasser and Blaster/MSBLAST that make it spread incredibly quickly, and the fact that it pushed Microsoft to issue a security patch for unsupported operating systems goes to show how unique and damaging of a threat it is," danooct1 told Motherboard via Twitter DM.Read more on Motherboard.