alert http $HOME_NET any -> $EXTERNAL_NET any (
msg:"ET MALWARE APT Mustang Panda Payload - CnC Checkin";
flow:established,to_server;
http.method;
content:"POST";
http.uri;
content:"?wd=";
pcre:"/^[a-f0-9]{8}$/Ri";
http.header_names;
content:"x-debug";
content:"x-request";
content:"x-content";
content:"x-storage";
reference:url,www.anomali.com/blog/china-based-apt-mustang-panda-targets-minority-groups-public-and-private-sector-organizations;
classtype:command-and-control;
sid:2028823; rev:3;
metadata:affected_product Windows_XP_Vista_7_8_10_Server_32_64_Bit, attack_target Client_and_Server, created_at 2019_10_14, deployment Perimeter, deployment SSLDecrypt, performance_impact Low, confidence High, signature_severity Major, tag MustangPanda, tag TA416, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2020_10_19;
)