alert tcp $HOME_NET any -> $EXTERNAL_NET any (msg:"ET MALWARE W32/Dinwod.Dropper Win32/Xtrat.B CnC Beacon"; flow:established,to_server; dsize:<30; content:"myversion|7C|"; depth:10; pcre:"/^\d/R"; reference:md5,dd6a13ba9177a18a8cf16b52ff643abc; classtype:command-and-control; sid:2018101; rev:5; metadata:attack_target Client_Endpoint, created_at 2014_02_10, deployment Perimeter, malware_family Win32_Xtrat_B, signature_severity Major, tag c2, updated_at 2019_07_26, mitre_tactic_id TA0010, mitre_tactic_name Exfiltration, mitre_technique_id T1041, mitre_technique_name Exfiltration_Over_C2_Channel;)