alert http $HOME_NET any -> $EXTERNAL_NET any (msg:"ET MALWARE BlackSanta Payload Request"; flow:established,to_server; flowbits:set,ET.BlackSantaPayload; http.method; content:"GET"; http.uri; content:".aspx"; endswith; http.accept; bsize:1; content:"t"; http.request_body; bsize:74; content:"dbseckey="; startswith; fast_pattern; content:"&"; endswith; classtype:command-and-control; sid:2067849; rev:1; metadata:affected_product Windows_XP_Vista_7_8_10_Server_32_64_Bit, attack_target Client_Endpoint, tls_state TLSDecrypt, created_at 2026_02_19, deployment Perimeter, deployment SSLDecrypt, malware_family BlackSanta, confidence High, signature_severity Major, updated_at 2026_02_19, mitre_tactic_id TA0011, mitre_tactic_name Command_And_Control, mitre_technique_id T1105, mitre_technique_name Ingress_Tool_Transfer; target:src_ip;)