alert tcp $EXTERNAL_NET any -> $HOME_NET 445 (msg:"GPL NETBIOS SMB-DS IPC$ unicode share access"; flow:established,to_server; content:"|00|"; depth:1; content:"|FF|SMBu"; within:5; distance:3; byte_test:1,&,128,6,relative; byte_jump:2,34,little,relative; content:"I|00|P|00|C|00 24 00 00 00|"; distance:2; nocase; flowbits:set,smb.tree.connect.ipc; classtype:protocol-command-decode; sid:2102466; rev:9; metadata:created_at 2010_09_23, confidence Medium, signature_severity Informational, updated_at 2019_07_26;)