alert http $HOME_NET any -> $EXTERNAL_NET any (msg:"ET MALWARE W32/Ke3chang.BMW.APT Campaign CnC Beacon"; flow:established,to_server; urilen:35<>37; http.method; content:"POST"; http.uri; content:".aspx?Random="; fast_pattern; pcre:"/^\x2F(?:acheb|bajree|cyacrin|dauber|eaves)\x2Easpx\x3FRandom\x3D[a-z]{16}$/i"; reference:url,www.fireeye.com/resources/pdfs/fireeye-operation-ke3chang.pdf; reference:url,www.fireeye.com/blog/technical/malware-research/2013/12/operation-ke3chang-targeted-attacks-against-ministries-of-foreign-affairs.html; classtype:targeted-activity; sid:2017858; rev:4; metadata:attack_target Client_Endpoint, created_at 2013_12_13, deployment Perimeter, signature_severity Major, tag c2, updated_at 2020_09_22, mitre_tactic_id TA0010, mitre_tactic_name Exfiltration, mitre_technique_id T1041, mitre_technique_name Exfiltration_Over_C2_Channel;)