alert tcp $EXTERNAL_NET $HTTP_PORTS -> $HOME_NET any (msg:"ET MALWARE Proxy.Win32.Wopla.ag Server Reply"; dsize:12; flow:established,from_server; content:"|0d 00 00 00|"; depth:4; content:"|00 00 00 00 00 00|"; distance:2; within:6; classtype:trojan-activity; sid:2007604; rev:5; metadata:created_at 2010_07_30, confidence Medium, signature_severity Major, updated_at 2019_07_26;)