alert http $EXTERNAL_NET any -> $HOME_NET any (msg:"ET MALWARE StealC v2 CnC Server Response"; flow:established,to_client; flowbits:isset,ET.StealC.v2; http.response_body; content:"ey"; startswith; content:"CIsIm9wY29kZSI6In"; distance:0; fast_pattern; classtype:command-and-control; sid:2061451; rev:1; metadata:affected_product Windows_XP_Vista_7_8_10_Server_32_64_Bit, attack_target Client_Endpoint, tls_state plaintext, created_at 2025_04_11, deployment Perimeter, malware_family Stealc, confidence High, signature_severity Critical, tag c2, updated_at 2025_04_11, mitre_tactic_id TA0011, mitre_tactic_name Command_And_Control, mitre_technique_id T1071, mitre_technique_name Application_Layer_Protocol; target:dest_ip;)