alert tcp $EXTERNAL_NET any -> $HOME_NET 445 (msg:"GPL NETBIOS SMB-DS NT Trans NT CREATE unicode invalid SACL ace size dos attempt"; flow:stateless; content:"|00|"; depth:1; content:"|FF|SMB|A0|"; within:5; distance:3; byte_test:1,&,128,6,relative; content:"|01 00|"; within:2; distance:64; byte_jump:4,-7,little,relative,from_beginning; content:!"|00 00 00 00|"; within:4; distance:16; byte_jump:4,16,relative,little; content:"|00 00|"; within:2; distance:-10; classtype:protocol-command-decode; sid:2103048; rev:5; metadata:created_at 2010_09_23, confidence Medium, signature_severity Informational, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2019_07_26;)