The only way to deal with hackers is to fight fire with fire.
Tips
history
First recorded in Tao Zongyi's late-Yuan miscellany 《辍耕录》, describing 骨咄犀, a horn-like substance considered extremely poisonous yet able to neutralize other poisons: its nature is utterly poisonous, yet it can cure poison; this is what is meant by fighting poison with poison. Originally a TCM principle, now used metaphorically for any 'fight evil with evil' tactic.
usage
Often carries a hint of grim necessity - you reach for 以毒攻毒 when nicer methods have failed. Compare English 'fight fire with fire'.
