alert http $HOME_NET any -> $EXTERNAL_NET any (msg:"ET MALWARE VBA/TrojanDownloader.Agent.PAC Retreiving Malicious VBScript"; flow:established,to_server; http.method; content:"GET"; http.uri; content:"/open?id="; fast_pattern; startswith; pcre:"/^(?:[A-Za-z0-9+\x2f]{4})*(?:[A-Za-z0-9+\x2f]{2}==|[A-Za-z0-9+\x2f]{3}=|[A-Za-z0-9+\x2f]{4})$/R"; http.header_names; to_lowercase; content:!"|0d 0a|referer|0d 0a|"; reference:md5,7489fb981cd054c665e442dfea8ef203; reference:url,blogs.jpcert.or.jp/en/2019/07/spear-phishing-against-cryptocurrency-businesses.html; classtype:trojan-activity; sid:2027697; rev:6; metadata:affected_product Windows_XP_Vista_7_8_10_Server_32_64_Bit, attack_target Client_Endpoint, created_at 2019_07_10, deployment Perimeter, malware_family VBA_TrojanDownloader_Agent_PAC, performance_impact Moderate, confidence High, signature_severity Major, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2025_10_01;)