In title compound, C(11)H(8)BrN(3)OS, the dihedral angle between the two aromatic rings is 27.61 (14)° and the Br atom is disordered over two sites with an occupancy ratio of 0.804 (2):0.196 (2). In the crystal, the mol-ecules are linked by N-H⋯O, C-H⋯O and C-H⋯N inter-actions, resulting in chains.