alert http $EXTERNAL_NET any -> $HOME_NET any (msg:"ET MALWARE Loki Locker Ransomware Server Response (Public Key) M1"; flow:established,to_client; http.stat_code; content:"200"; http.content_type; content:"text|2f|html|3b 20|charset|3d|UTF|2d|8"; bsize:24; http.content_len; byte_test:0,<=,1000,0,string,dec; http.response_body; content:"|7b 22|public|22 3a 22|"; startswith; fast_pattern; content:"|22 2c 22|message|5f|id|22 3a 22|"; distance:0; content:!"|22 2c 22|"; distance:0; reference:url,blogs.blackberry.com/en/2022/03/lokilocker-ransomware; reference:md5,8aea251877cb4f5ee6cf357831f8620c; reference:url,twitter.com/James_inthe_box/status/1504194638885711872; classtype:trojan-activity; sid:2035512; rev:2; metadata:affected_product Windows_XP_Vista_7_8_10_Server_32_64_Bit, attack_target Client_Endpoint, created_at 2022_03_17, deployment Perimeter, performance_impact Low, confidence High, signature_severity Major, tag Ransomware, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2022_03_22, mitre_tactic_id TA0040, mitre_tactic_name Impact, mitre_technique_id T1486, mitre_technique_name Data_Encrypted_for_Impact;)