alert http $HOME_NET any -> $EXTERNAL_NET any (msg:"ET RETIRED Troj_Yahoya Variant CnC Checkin"; flow:established,to_server; http.method; content:"GET"; http.uri; content:"/id|3f 3d|NT|28|Win"; fast_pattern; startswith; content:"x64|29 5f|AV|28|"; distance:0; content:"|29 7c 7c|QN|28|"; distance:0; content:"|29 7c 7c|WN|28|"; distance:0; content:"|29 7c 7c|HN|28|"; distance:0; content:"|29 7c 7c|MA|28|"; distance:0; content:"|29 7c 7c|WF|28|"; distance:0; content:"|29 7c 7c|VE|28|"; distance:0; http.header_names; content:!"User-Agent"; content:!"Referer"; reference:md5,7f8b4a962edea1dd9d552fbc907f76bb; reference:url,research.checkpoint.com/2022/chinese-actor-takes-aim-armed-with-nim-language-and-bizarro-aes/; classtype:targeted-activity; sid:2037233; rev:2; metadata:affected_product Windows_XP_Vista_7_8_10_Server_32_64_Bit, attack_target Client_and_Server, created_at 2022_06_30, deployment Perimeter, deployment SSLDecrypt, former_category MALWARE, malware_family Troj_Yahoya, performance_impact Low, confidence Medium, signature_severity Major, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2024_09_17, reviewed_at 2024_09_17;)