These are more commonly known as Chinese Zombies. Unlike the western concept of Zombies, these do not go around looking for human flesh. Instead, these are often the minions of magicians or sorcerers that do their bidding. However, like their western counterparts, they have no will of their own. Jiang shi tend not to be able to walk, but hop with their arms outstretched perpendicular from their bodies. For cadavers to become jiang shi, the magician needs to paste a talisman with a spell on the forehead of the corpse. No one knows how these talismans are created. Supposedly, there are two ways to ‘kill’ these creatures, one of which is to destroy the talisman pasted on their foreheads, but this is excruciatingly difficult as these creature are more than twice as strong as a normal human and impervious to most weapons. The other way to destroy them is to kill their creators. It is recommended, instead, to throw glutinous rice at them. The rice is known to hurt them and therefore slow them down. It is not known why this happens but it does.
This creature was made known to my informant when he was growing up in China. He does not quite recall where he heard it from. However, these creatures are not just confined to China, as my informant has heard a version of these creatures when he arrived in Singapore as well. It is assumed that most countries with Chinese would have these creatures as they are made from corpses, and all you’d need to know is the talisman making ritual.
The magicians that create these are usually from the Taoist traditions. Strangely enough, there is no devil in this situation. Unlike most western and Latin American ghouls and creatures, no hint of Christianity has appeared in this particular piece of folklore. In fact, this black magic is based in the dark-side of things and the unnatural.
Chinese mythology does have demons and the devil, but they just balance each other out. A binary opposition because of the yin-yang, light-dark, everything has an opposite in nature. There are good magicians as well, but they draw on a different source of power in nature.