alert http $HOME_NET any -> $EXTERNAL_NET any (msg:"ET MALWARE CoinVault Mailer CnC Beacon"; flow:established,to_server; http.method; content:"GET"; http.uri; content:"/redirect.php?loc=mail"; fast_pattern; pcre:"/\/redirect\.php\?loc=mail$/"; http.header_names; to_lowercase; content:!"|0d 0a|user-agent|0d 0a|"; content:!"|0d 0a|accept"; content:!"|0d 0a|referer|0d 0a|"; reference:md5,af0e5a5df0be279aa517e2fd65cadd5c; reference:url,kernelmode.info/forum/viewtopic.php?f=16&t=3581; classtype:command-and-control; sid:2020906; rev:5; metadata:attack_target Client_Endpoint, created_at 2015_04_14, deployment Perimeter, signature_severity Major, tag c2, updated_at 2024_04_21, mitre_tactic_id TA0010, mitre_tactic_name Exfiltration, mitre_technique_id T1041, mitre_technique_name Exfiltration_Over_C2_Channel;)