alert tcp any any -> any [139,445] (msg:"ET INFO Potentially unsafe SMBv1 protocol in use"; flow:established,to_server; content:"|FF|SMB"; offset:4; depth:4; content:!"r"; within:1; threshold:type limit, count 1, track by_src, seconds 1200; reference:url,www.us-cert.gov/ncas/current-activity/2017/01/16/SMB-Security-Best-Practices; reference:url,blogs.technet.microsoft.com/filecab/2016/09/16/stop-using-smb1/; classtype:not-suspicious; sid:2023997; rev:3; metadata:affected_product Windows_XP_Vista_7_8_10_Server_32_64_Bit, attack_target Client_Endpoint, created_at 2017_02_17, deployment Perimeter, performance_impact Low, confidence High, signature_severity Major, updated_at 2019_07_26;)