alert tcp-pkt any any -> [$HTTP_SERVERS,$HOME_NET] ![139,445] (msg:"ET EXPLOIT Possible Zerologon NetrServerAuthenticate with 0x00 Client Credentials (CVE-2020-1472)"; flow:established,to_server; content:"|00|"; offset:2; content:"|1a 00|"; distance:19; within:2; content:"|5c 00 5c 00|"; within:50; content:"|24 00 00 00 06 00|"; distance:0; fast_pattern; content:"|00 00 00 00 00 00 00 00|"; distance:0; isdataat:!5,relative; threshold:type limit, count 5, seconds 30, track by_src; reference:url,www.secura.com/blog/zero-logon; reference:cve,2020-1472; classtype:attempted-admin; sid:2030871; rev:2; metadata:affected_product Windows_XP_Vista_7_8_10_Server_32_64_Bit, attack_target Server, created_at 2020_09_14, cve CVE_2020_1472, deployment Perimeter, deployment Internal, confidence Medium, signature_severity Major, tag CISA_KEV, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2020_09_18;)