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;)