alert http $HOME_NET any -> $EXTERNAL_NET any (msg:"ET RETIRED JynxLoaderV2 CnC Checkin"; flow:established,to_server; http.request_line; content:"POST / HTTP/1.1"; http.user_agent; content:"4a696e785632"; startswith; fast_pattern; http.header_names; content:!"|0d 0a|Referer|0d 0a|"; http.content_len; byte_test:0,>,200,0,string,dec; byte_test:0,<,300,0,string,dec; http.request_body; pcre:"/^[a-f0-9]{200}/"; content:"7c31"; reference:url,twitter.com/Unit42_Intel/status/1730237085246775562; reference:md5,46ce034ff575452d1d26c2002788f403; classtype:trojan-activity; sid:2049408; rev:2; metadata:affected_product Windows_XP_Vista_7_8_10_Server_32_64_Bit, affected_product Windows_11, attack_target Client_and_Server, created_at 2023_11_30, deployment Perimeter, former_category MALWARE, performance_impact Low, confidence High, signature_severity Major, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2025_07_14, reviewed_at 2025_07_14; target:src_ip;)