Ok, it’s clearly not an attack but it’s a pretty cool street art installation. In fact it’s an Art Exhibition in Prague and it has been created by Czech artist ‘EPOS257’.
The Mongolian Death Worm also known as Orghoi khorkhoi is a cryptid purported to exist in the Gobi Desert. It is described as a bright red worm with a wide body that is 0.6 to 1.5 meters (2 to 5 feet) long. The local name is allghoi, which means "blood filled intestine worm" because it is reported to look like the intestine of a cow. It is the subject of a number of extraordinary claims by Mongolian locals—such as the ability of the worm to spew forth sulfuric acid that, on contact, will turn anything it touches yellow and corroded (which would kill a human), and its purported ability to kill at a distance by means of electric discharge.