alert tcp $EXTERNAL_NET any -> $HOME_NET 139 (msg:"GPL NETBIOS SMB too many stacked requests"; flow:to_server,established; content:"|FF|SMB"; pcre:"/^\x00.{3}\xFFSMB(\x73|\x74|\x75|\xa2|\x24|\x2d|\x2e|\x2f).{28}(\x73|\x74|\x75|\xa2|\x24|\x2d|\x2e|\x2f)/"; byte_jump:2,39,little; content:!"|FF|"; within:1; distance:-36; classtype:protocol-command-decode; sid:2102950; rev:4; metadata:created_at 2010_09_23, signature_severity Informational, updated_at 2019_07_26;)