Cryptojacking is the most common form of cyber attack threatening businesses and it could lead to much more costly attacks When we think of cyber-attacks, we dont tend to picture the quiet mining of cryptocurrency but thats exactly whats involved in cryptojacking. The 2017 WannaCry, Petya and NotPetya attacks unveiled just how formidable the reach of hackers has grown, but a cyber-attack doesnt have to cause widespread damage to be deadly.