alert tcp $EXTERNAL_NET any -> $HOME_NET 139 (msg:"GPL NETBIOS SMB InitiateSystemShutdown unicode andx attempt"; flow:established,to_server; flowbits:isset,smb.tree.bind.winreg; 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,-10,relative,from_beginning; content:"|05|"; distance:4; within:1; byte_test:1,&,16,3,relative; content:"|00|"; within:1; distance:1; content:"|00 18|"; within:2; distance:19; classtype:protocol-command-decode; sid:2102994; rev:5; metadata:created_at 2010_09_23, signature_severity Informational, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2019_07_26;)