alert tcp $EXTERNAL_NET any -> $HOME_NET 139 (msg:"GPL NETBIOS SMB ISystemActivator unicode andx bind attempt"; flow:established,to_server; content:"|00|"; depth:1; content:"|FF|SMB"; within:4; distance:3; pcre:"/^(\x75|\x2d|\x2f|\x73|\xa2|\x2e|\x24|\x74)/sR"; byte_test:1,&,128,6,relative; content:"%"; depth:1; offset:39; byte_jump:2,0,little,relative; content:"&|00|"; within:2; distance:29; content:"|5C 00|P|00|I|00|P|00|E|00 5C 00 00 00|"; distance:4; nocase; byte_jump:2,-17,relative,from_beginning,little; isdataat:4,relative; content:"|05|"; byte_test:1,!&,16,3,relative; content:"|0B|"; within:1; distance:1; content:"|A0 01 00 00 00 00 00 00 C0 00 00 00 00 00 00|F"; within:16; distance:29; flowbits:set,dce.isystemactivator.bind; flowbits:noalert; classtype:protocol-command-decode; sid:2103399; rev:4; metadata:created_at 2010_09_23, confidence High, signature_severity Informational, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2019_07_26;)