alert http $HOME_NET any -> $EXTERNAL_NET any (msg:"ET MOBILE_MALWARE Phenakite Image Upload CnC activity"; flow:established,to_server; http.method; content:"POST"; http.accept; content:"*/*"; bsize:3; http.content_type; content:"application/json"; bsize:16; http.request_body; content:"|22|img_name|22 3a 22|"; fast_pattern; content:"|22|img|22 3a 22|"; reference:url,about.fb.com/wp-content/uploads/2021/04/Technical-threat-report-Arid-Viper-April-2021.pdf; classtype:targeted-activity; sid:2032810; rev:1; metadata:affected_product iOS, attack_target Mobile_Client, created_at 2021_04_23, deployment Perimeter, deployment SSLDecrypt, malware_family Phenakite, confidence High, signature_severity Major, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2021_04_23;)