alert http $HOME_NET any -> $EXTERNAL_NET any (msg:"ET MALWARE W32/Matsnu.Backdoor CnC Beacon"; flow:established,to_server; http.uri; content:"id="; content:"&mynum="; content:"&ver="; content:"&cvr="; content:"&threadid="; fast_pattern; content:"&lang="; content:"&os="; reference:url,www.seculert.com/blog/2014/11/dgas-a-domain-generation-evolution.html; classtype:command-and-control; sid:2019741; rev:4; metadata:attack_target Client_Endpoint, created_at 2014_11_18, deployment Perimeter, signature_severity Major, tag c2, updated_at 2020_09_28, mitre_tactic_id TA0010, mitre_tactic_name Exfiltration, mitre_technique_id T1041, mitre_technique_name Exfiltration_Over_C2_Channel;)