alert http $EXTERNAL_NET any -> $HOME_NET any (msg:"ET POLICY Executable Download From DropBox"; flow:established,to_client; http.server; content:"dbws"; bsize:4; file.data; content:"MZ"; depth:2; byte_jump:4,58,relative,little; content:"PE|00 00|"; distance:-64; within:4; classtype:not-suspicious; sid:2014313; rev:10; metadata:created_at 2012_03_06, confidence High, signature_severity Informational, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2020_08_03;)