The same rule works with passive forms.
Place مَا before the passive past form:
MeaningNegative passive
he was not acted uponمَا فُعِلَ
they two men were not acted uponمَا فُعِلَا
you (one man) were not acted uponمَا فُعِلْتَ
I was not acted uponمَا فُعِلْتُ
Again, مَا changes the meaning, not the passive form itself.