alert http $HOME_NET any -> $EXTERNAL_NET any (msg:"ET MALWARE Possible Charming Kitten Backdoor CnC Activity"; flow:established,to_server; http.method; content:"POST"; http.user_agent; bsize:19; content:"WinHTTP Example/1.0"; http.request_body; content:"server_module_name="; fast_pattern; content:"&server_task"; content:"&systemtype="; reference:md5,3d67ce57aab4f7f917cf87c724ed7dab; reference:url,blog.certfa.com/posts/fake-interview-the-new-activity-of-charming-kitten/; classtype:targeted-activity; sid:2029495; rev:1; metadata:affected_product Windows_XP_Vista_7_8_10_Server_32_64_Bit, attack_target Client_Endpoint, created_at 2020_02_19, deployment Perimeter, confidence Medium, signature_severity Major, updated_at 2020_02_19;)