Two common methods of disrupting the communication on a wireless sensor network (WSN) are pack dropping and packet modification. There are a variety of schemes and mechanisms built to tackle these attacks but not many of them are that effective to identify these intruders efficiently. In order to address this issue our system introduces a mechanism to identify these misbehaving forwarders that drop or attempt to modify packets. An extensive analysis as well as simulation has been made to validate the efficiency and validity of this scheme using network simulator.