Selective packet drop attack is notorious security problem in wireless Mobile Ad-hoc NETwork (MANET). A mobile ad-hoc network is wireless networks without any pre-existing infrastructure and centralizes control. They have self-organizing capabilities with mobile nodes. Ad-hoc network contains multi-hop routes capabilities within short transmission range. Because of openness nature MANET is malicious by attacker. Several approaches have been proposed for finding malicious activity in MANETs. Due to nonexistence of MANET infrastructure and well defied perimeter MANETs are susceptible to variety of attacker types.