alert http $HOME_NET any -> $EXTERNAL_NET any (msg:"ET MALWARE MarkiRAT CnC Checkin Attempt"; flow:established,to_server; http.method; content:"GET"; http.uri; content:"/i.php|3f|u|3d|"; startswith; fast_pattern; content:"i|3d|"; distance:0; reference:url,www.recordedfuture.com/research/nexus-tag182-disseminates-markirat; classtype:trojan-activity; sid:2070179; rev:1; metadata:affected_product Windows_XP_Vista_7_8_10_Server_32_64_Bit, attack_target Client_Endpoint, tls_state plaintext, created_at 2026_07_02, deployment Perimeter, malware_family Marki, performance_impact Low, confidence High, signature_severity Major, tag RAT, tag TAG_182, updated_at 2026_07_02, mitre_tactic_id TA0011, mitre_tactic_name Command_And_Control, mitre_technique_id T1041, mitre_technique_name Exfiltration_Over_C2_Channel; target:src_ip;)