Pixel Envy

Written by Nick Heer.

How to Accidentally Stop a Global Ransomware Attack

“MalwareTech”:

I woke up at around 10 AM and checked onto the UK cyber threat sharing platform where i had been following the spread of the Emotet banking malware, something which seemed incredibly significant until today. There were a few of your usual posts about various organisations being hit with ransomware, but nothing significant…yet. I ended up going out to lunch with a friend, meanwhile the WannaCrypt ransomware campaign had entered full swing.

When I returned home at about 2:30, the threat sharing platform was flooded with posts about various NHS systems all across the country being hit, which was what tipped me of to the fact this was something big. Although ransomware on a public sector system isn’t even newsworthy, systems being hit simultaneously across the country is (contrary to popular belief, most NHS employees don’t open phishing emails which suggested that something to be this widespread it would have to be propagated using another method). I was quickly able to get a sample of the malware with the help of Kafeine, a good friend and fellow researcher. Upon running the sample in my analysis environment I instantly noticed it queried an unregistered domain, which I promptly registered.

The key takeaway in this story is that “MalwareTech” followed their usual protocols; the effect was simply far more profound in this instance. Incredible stuff.