alert tcp $HOME_NET any -> $EXTERNAL_NET any (msg:"ET MALWARE Win32/Cutwail.BE Checkin 1"; flow:established,from_client; dsize:234; content:"|16 03 00 00 37 01 00 00 33 03 00|"; depth:11; threshold:type limit, track by_src, seconds 60, count 1; reference:md5,4352407efc8891215b514a54db5b8a1d; reference:md5,45ab3554f3d60d07fc5228faff7784e1; classtype:command-and-control; sid:2014271; rev:3; metadata:created_at 2012_02_22, malware_family Win32_Cutwail_BE, confidence Medium, signature_severity Major, updated_at 2019_07_26;)