alert http $HOME_NET any -> $EXTERNAL_NET any (msg:"ET MALWARE Win32/Phorpiex Requesting Compromised Email Credentials List"; flow:established,to_server; http.method; content:"GET"; http.uri; content:".txt"; endswith; fast_pattern; pcre:"/^\/\w+\/\d{1,4}\.txt$/"; http.user_agent; content:"Mozilla/5.0|20 28|Windows|20|NT|20|10.0|3b 20|Win64|3b 20|x64|29|"; http.header_names; content:"|0d 0a|User-Agent|0d 0a|Host|0d 0a 0d 0a|"; startswith; classtype:command-and-control; sid:2045230; rev:1; metadata:affected_product Windows_XP_Vista_7_8_10_Server_32_64_Bit, attack_target Client_Endpoint, created_at 2023_04_27, deployment Perimeter, malware_family Phorpiex, performance_impact Significant, confidence High, signature_severity Major, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2023_04_28;)