alert tcp $HOME_NET any -> $EXTERNAL_NET any (msg:"ET MALWARE Netwire RAT Client Check-in 2"; flow:established,to_server; dsize:5; content:"|01 00 00 00 02|"; flowbits:isset,ET.NetwireRAT.Client; reference:md5,acccfa6107c712a63b1473d524461163; classtype:trojan-activity; sid:2021290; rev:2; metadata:created_at 2015_06_17, signature_severity Major, updated_at 2019_07_26;)