alert http $HOME_NET any -> $EXTERNAL_NET any (msg:"ET RETIRED Win32/Fynloski.AA CnC Checkin"; flow:established,to_server; http.method; content:"GET"; http.uri; content:"/ok?hw="; fast_pattern; startswith; content:"uuid={"; pcre:"/^[A-F0-9]{8}-(?:[A-F0-9]{4}-){3}[A-F0-9]{12}\}/R"; content:"ver="; content:"name="; content:"system="; content:"sysdate="; content:"act="; content:"str1="; content:"str2="; content:"str3="; http.header_names; content:!"Referer"; content:"User-Agent|0d 0a|Host|0d 0a|Cache-Control|0d 0a 0d 0a|"; reference:md5,082ba31c83e3fc1114b6444111e88019; classtype:trojan-activity; sid:2037234; rev:2; metadata:affected_product Windows_XP_Vista_7_8_10_Server_32_64_Bit, attack_target Client_Endpoint, created_at 2022_06_30, deployment Perimeter, former_category MALWARE, malware_family Win32_Fynloski_AA, performance_impact Low, confidence High, signature_severity Major, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2024_09_17, reviewed_at 2024_09_17;)