A　mobile　ad-hoc　network　(MANET)　is　a　temporary　network　of　wireless　mobile　nodes.　In　a　MANET,　it　is　assumed　that　all　of　the　nodes　cooperate　with　each　other　to　transfer　data　packets　in　a　multi-hop　fashion.　However,　some　malicious　nodes　don＇t　cooperate　with　other　nodes　and　disturb　the　network　through　false　routing　information.　In　this　paper,　we　propose　a　prominent　technique,　called　dual　attack　detection　for　black　and　gray　hole　attacks　(DDBG),　for　MANETs.　The　proposed　DDBG　technique　selects　the　intrusion　detection　system　(IDS)　node　using　the　connected　dominating　set　(CDS)　technique　with　two　additional　features;　the　energy　and　its　nonexistence　in　the　blacklist　are　also　checked　before　putting　the　nodes　into　the　IDS　set.　The　CDS　is　an　effective,　distinguished,　and　localized　approach　for　detecting　nearly-connected　dominating　sets　of　nodes　in　a　small　range　in　mobile　ad　hoc　networks.　The　selected　IDS　nodes　broadcast　a　kind　of　status　packet　within　a　size　of　the　dominating　set　for　retrieving　the　complete　behavioral　information　from　their　nodes.　Later,　IDS　nodes　use　our　DDBG　technique　to　analyze　the　collected　behavioral　information　to　detect　the　malicious　nodes　and　add　them　to　the　blacklist　if　the　behavior　of　the　node　is　suspicious.　Our　experimental　results　show　that　the　quality　of　the　service　parameters　of　the　proposed　technique　outperforms　the　existing　routing　schemes.　©　2019　by　the　authors.