alert http $HOME_NET any -> $EXTERNAL_NET any (msg:"ET MALWARE Aoqin Dragon APT Related Activity (GET)"; flow:established,to_server; http.method; content:"GET"; http.uri; pcre:"/^\/(?:[A-Za-z0-9+/]{4})*(?:[A-Za-z0-9+/]{2}==|[A-Za-z0-9+/]{3}=|[A-Za-z0-9+/]{4})$/"; http.user_agent; bsize:48; content:"Mozilla/4.0 (compatible|3b|MSIE 6.0|3b|Windows NT 5.1)"; fast_pattern; http.header_names; to_lowercase; content:!"|0d 0a|referer|0d 0a|"; reference:url,www.sentinelone.com/labs/aoqin-dragon-newly-discovered-chinese-linked-apt-has-been-quietly-spying-on-organizations-for-10-years/; reference:md5,5b1cf30e372c9fee9b9b661148271c05; classtype:trojan-activity; sid:2036966; rev:4; metadata:attack_target Client_Endpoint, created_at 2022_06_13, deployment Perimeter, deprecation_reason Duplicate, confidence High, signature_severity Major, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2024_04_30;)