alert tcp $EXTERNAL_NET any -> $HOME_NET any (msg:"ET MALWARE x0Proto File Contents Exfil Request"; flow:established,from_server; dsize:9; content:"DLOAD|0c|1|0c|1"; depth:9; reference:md5,3d5a4b51ff4ad8534873e02720aeff34; classtype:trojan-activity; sid:2024423; rev:1; metadata:created_at 2017_06_23, confidence High, signature_severity Major, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2019_07_26;)