alert http $HOME_NET any -> $EXTERNAL_NET any (msg:"ET MALWARE W32/Dadobra.Downloader/DNSChanger Dnsmake CnC Beacon"; flow:established,to_server; http.uri; content:"/dnsmake.txt"; fast_pattern; http.user_agent; content:"Indy Library"; reference:md5,dd3e5b41238a73d627c6c48108a15452; classtype:command-and-control; sid:2018150; rev:4; metadata:attack_target Client_Endpoint, created_at 2014_02_18, deployment Perimeter, signature_severity Major, tag c2, updated_at 2020_04_27, mitre_tactic_id TA0010, mitre_tactic_name Exfiltration, mitre_technique_id T1041, mitre_technique_name Exfiltration_Over_C2_Channel;)