alert http $EXTERNAL_NET any -> $HOME_NET any (msg:"ET MALWARE Arkanix Stealer CnC Response M1"; flow:established,to_client; flowbits:isset,ET.Arkanix.Checkin; http.stat_code; content:"200"; http.response_body; content:"|22|desktop_fingerprint|22 3a 22|"; fast_pattern; pcre:"/^[a-f0-9]{16}/R"; content:"|22|expires_in_minutes|22 3a|"; content:"|22|message|22 3a 22|Session|20|created|20|successfully|22|"; content:"|22|success|22 3a|true"; content:"|22|token|22 3a 22|"; reference:url,hunting.abuse.ch/hunt/691d7ec0e73ba/arkanix.pw/#sandnet; reference:md5,643696a052ea1963e24cfb0531169477; classtype:trojan-activity; sid:2065836; rev:1; metadata:affected_product Windows_XP_Vista_7_8_10_Server_32_64_Bit, affected_product Windows_11, attack_target Client_Endpoint, tls_state TLSDecrypt, created_at 2025_11_19, deployment Perimeter, malware_family Stealer, performance_impact Low, confidence High, signature_severity Major, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2025_11_19, mitre_tactic_id TA0009, mitre_tactic_name Collection, mitre_technique_id T1005, mitre_technique_name Data_from_local_system; target:src_ip;)