alert http $HOME_NET any -> $EXTERNAL_NET any (msg:"ET MALWARE Rhabdo CnC Activity M2"; flow:established,to_server; http.method; content:"GET"; http.uri; content:"/wwwlib/title.php?ID="; depth:21; pcre:"/^[A-Za-z0-9]{48}\x3a(?:[A-Za-z0-9/+]{4})*(?:[A-Za-z0-9/+]{2}==|[A-Za-z0-9/+]{3}=|[A-Za-z0-9/+]{4})$/R"; http.user_agent; content:"Mozilla/5.0 (Windows NT 6.1|3b 20|Win64|3b 20|x64|3b 20|rv:47.0) Gecko / 20100101 Chrome/73.0.3645.0"; http.header_names; content:"|0d 0a|User-Agent|0d 0a|Host|0d 0a|Cache-Control|0d 0a 0d 0a|"; depth:37; endswith; reference:url,www.anomali.com/blog/anomali-suspects-that-china-backed-apt-pirate-panda-may-be-seeking-access-to-vietnam-government-data-center?utm_medium=social&utm_source=linkedin&utm_content=blog; classtype:targeted-activity; sid:2030070; rev:2; metadata:affected_product Windows_XP_Vista_7_8_10_Server_32_64_Bit, attack_target Client_Endpoint, created_at 2020_04_30, deployment Perimeter, confidence High, signature_severity Major, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2020_04_30;)