alert http $HOME_NET any -> $EXTERNAL_NET any (msg:"ET RETIRED Win32/Delf.TJJ CnC Checkin M1"; flow:established,to_server; http.method; content:"GET"; http.uri; content:"/index/getcfg?id="; fast_pattern; startswith; pcre:"/^\d{3,6}$/R"; http.header_names; content:!"Referer"; content:"|0d 0a|Host|0d 0a|Accept|0d 0a|Accept-Encoding|0d 0a|User-Agent|0d 0a 0d 0a|"; http.user_agent; content:"Mozilla/3.0|20 28|compatible|3b 20|Indy Library|29|"; reference:md5,2e7b9acaf5725c84c9ec9687af15d48e; classtype:trojan-activity; sid:2037107; rev:2; metadata:attack_target Client_Endpoint, created_at 2022_06_24, deployment Perimeter, former_category MALWARE, malware_family Delf_TJJ, performance_impact Low, confidence High, signature_severity Major, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2025_04_17, reviewed_at 2025_04_17;)