alert tcp $EXTERNAL_NET any -> $HOME_NET 139 (msg:"GPL NETBIOS SMB Session Setup NTMLSSP unicode asn1 overflow attempt"; flow:established,to_server; content:"|00|"; depth:1; content:"|FF|SMBs"; within:5; distance:3; byte_test:1,&,128,6,relative; byte_test:4,&,2147483648,48,relative,little; content:!"NTLMSSP"; within:7; distance:54; asn1:double_overflow, bitstring_overflow, relative_offset 54, oversize_length 2048; reference:bugtraq,9633; reference:bugtraq,9635; reference:cve,2003-0818; reference:nessus,12052; reference:nessus,12065; reference:url,www.microsoft.com/technet/security/bulletin/MS04-007.mspx; classtype:protocol-command-decode; sid:2103000; rev:8; metadata:created_at 2010_09_23, confidence Medium, signature_severity Informational, updated_at 2019_07_26;)