alert http $HOME_NET any -> $EXTERNAL_NET any (msg:"ET MALWARE ViperSoftX CnC Activity M2"; flow:established,to_server; http.header; content:"x-header|3a 20|viperSoftx_"; fast_pattern; reference:url,www.fortinet.com/blog/threat-research/vipersoftx-new-javascript-threat.html; classtype:command-and-control; sid:2029609; rev:2; metadata:affected_product Windows_XP_Vista_7_8_10_Server_32_64_Bit, attack_target Client_Endpoint, created_at 2020_03_11, deployment Perimeter, confidence High, signature_severity Major, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2020_03_11;)