alert tcp $EXTERNAL_NET any -> $HOME_NET 139 (msg:"GPL NETBIOS SMB InitiateSystemShutdown attempt"; flow:established,to_server; flowbits:isset,smb.tree.bind.winreg; content:"|00|"; depth:1; content:"|FF|SMB%"; within:5; distance:3; byte_test:1,!&,128,6,relative; content:"&|00|"; within:2; distance:56; content:"|5C|PIPE|5C 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:2102942; rev:6; metadata:created_at 2010_09_23, signature_severity Informational, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2019_07_26;)