alert http $HOME_NET any -> $EXTERNAL_NET any (msg:"ET MALWARE ViperSoftX HTTP CnC Activity"; flow:established,to_server; http.method; content:"GET"; http.uri; bsize:48; content:"/v2/"; startswith; content:"?v=Ver_"; fast_pattern; distance:36; within:7; pcre:"/^\/v2\/[0-9a-f]{8}\b-[0-9a-f]{4}-[0-9a-f]{4}-[0-9a-f]{4}-\b[0-9a-f]{12}\?v=Ver_\d$/"; http.host; pcre:"/^[a-z]{5,10}\.com$/"; threshold:type limit, count 1, seconds 120, track by_src; reference:url,chris.partridge.tech/2022/evolution-of-vipersoftx-dga/; reference:url,decoded.avast.io/janrubin/vipersoftx-hiding-in-system-logs-and-spreading-venomsoftx/; classtype:command-and-control; sid:2043153; rev:1; metadata:affected_product Windows_XP_Vista_7_8_10_Server_32_64_Bit, attack_target Client_Endpoint, created_at 2022_12_30, deployment Perimeter, malware_family ViperSoftX, performance_impact Low, confidence High, signature_severity Major, tag c2, updated_at 2022_12_30, mitre_tactic_id TA0010, mitre_tactic_name Exfiltration, mitre_technique_id T1041, mitre_technique_name Exfiltration_Over_C2_Channel; target:src_ip;)