Rule History

alert udp $HOME_NET 137 -> $EXTERNAL_NET any (msg:"ET SCAN Multiple NBTStat Query Responses to External Destination, Possible Automated Windows Network Enumeration"; content:"|20 43 4b 41 41 41 41 41 41 41 41 41 41 41 41 41 41 41 41 41 41 41 41 41 41 41 41 41 41 41 41 41 41 00 00 21|"; depth:55; threshold: type threshold, track by_dst, count 10, seconds 60; reference:url,technet.microsoft.com/en-us/library/cc940106.aspx; classtype:attempted-recon; sid:2009767; rev:4; metadata:created_at 2010_07_30, confidence Medium, signature_severity Informational, updated_at 2019_07_26;)