GPL NETBIOS SMB-DS Session Setup NTMLSSP unicode asn1 overflow attempt

alert tcp $EXTERNAL_NET any -> $HOME_NET 445 (
    msg:"GPL NETBIOS SMB-DS 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:2103003; rev:7;
    metadata:created_at 2010_09_23, cve CVE_2003_0818, confidence Medium, signature_severity Informational, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2019_07_26;
)