alert http $HOME_NET any -> $EXTERNAL_NET any (msg:"ET MALWARE RAZR Ransomware CnC Checkin"; flow:established,to_server; http.method; content:"POST"; http.uri; bsize:12; content:"/c2/receiver"; http.user_agent; bsize:17; content:"TLD13Browser/12.0"; fast_pattern; http.content_type; bsize:16; content:"application/json"; http.request_body; content:"|7b 22|id|22 3a 20 22|"; startswith; pcre:"/^(?:[A-Z0-9]{4}-){7}[A-Z0-9]{3}/R"; content:"|22 2c 20 22|iv|22 3a 20 22|"; within:10; pcre:"/^[a-f0-9]{32}/R"; content:"|22 2c 20 22|key|22 3a 20 22|"; within:11; pcre:"/^[a-f0-9]{64}/R"; content:"|22 7d|"; endswith; reference:md5,a1160fa83f4b7247a10c6476449a2719; classtype:trojan-activity; sid:2055401; 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 plaintext, created_at 2024_08_22, deployment Perimeter, malware_family RAZR_Ransomware, performance_impact Low, confidence High, signature_severity Major, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2024_08_22; target:src_ip;)