The gang, in their early 20s, struck in the Stratford Grove area of Penkridge on Sunday night.
Detectives from Staffordshire Police have launched an appeal over the incident, which happened at around 11.30pm.
The suspects were described as wearing all black, hooded and masked up, with one wearing a white Nike jacket.
They were all seen getting into a small dark coloured car before fleeing from the scene, a spokesman for the force said.
Anyone who saw the incident – or a car making off in the Shakespeare Drive, Boscomoor Lane, or Wolverhampton Road area – is urged to call 101.
Quote incident 828 of October 18.
Alternatively, call Crimestoppers anonymously on 0800 555111.