alert http $HOME_NET any -> $EXTERNAL_NET any (msg:"ET MALWARE AlphaCrypt CnC Beacon 6"; flow:established,to_server; urilen:>250; http.method; content:"GET"; http.uri; content:".php?"; pcre:"/\/[a-z]+\.php\?[A-F0-9]{250,}$/"; http.user_agent; content:"Mozilla/5.0 (Windows NT 6.3|3b 20|WOW64|3b 20|Trident/7.0|3b 20|Touch|3b 20|rv|3a|11.0) like Gecko"; fast_pattern; http.header_names; content:!"Accept"; content:!"Referer"; reference:md5,66bbfc1e5b027eb48c76078129194015; classtype:command-and-control; sid:2022300; rev:4; metadata:attack_target Client_Endpoint, created_at 2015_12_22, deployment Perimeter, signature_severity Major, tag c2, updated_at 2020_08_18, mitre_tactic_id TA0010, mitre_tactic_name Exfiltration, mitre_technique_id T1041, mitre_technique_name Exfiltration_Over_C2_Channel;)