alert tcp $HOME_NET any -> $EXTERNAL_NET any (msg:"ET MALWARE Win32.ServStart.D Checkin"; flow:to_server,established; content:"Win|20|"; pcre:"/^(:?[78]|XP)/Ri"; content:"MB|00|"; distance:0; content:"MHz|00|"; distance:0; content:"|20|Mbps|00|"; fast_pattern; reference:md5,ad906500dd344cbbdf37997a4b27389f; reference:url,blog.netlab.360.com/public-cloud-threat-intelligence-202203/; classtype:command-and-control; sid:2036415; rev:2; metadata:created_at 2016_03_15, confidence High, signature_severity Major, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2019_10_08;)