alert http1 $HOME_NET any -> $EXTERNAL_NET any (msg:"ET MALWARE [ANY.RUN] Socks5Systemz HTTP C2 Connection M1"; flow:established,to_server; http.method; content:"GET"; http.uri; content:"?"; depth:20; pcre:"/^(?:[^=]+=((?:[a-f0-9]){2}){78,104})$/"; http.user_agent; bsize:57; content:"Mozilla|2f|5|2e|0|20 28|Windows|3b 20|U|3b 20|MSIE|20|9|2e|0|3b 20|Windows|20|NT|20|9|2e|0|3b 20|en|2d|US|29|"; fast_pattern; http.header_names; bsize:22; content:"|0d 0a|Host|0d 0a|User-Agent|0d 0a 0d 0a|"; http.host; content:"."; offset:7; depth:1; pcre:"/^(?:[a-z]{7})\.(?:[a-z]{2,5})$/"; reference:md5,7308178fbfc957dec7a304ad131e0b5b; reference:url,app.any.run/tasks/685b5fb6-1b1a-4f4d-92f5-8a9593275a92; reference:url,community.emergingthreats.net/t/et-malware-socks5systemz/1155/; classtype:trojan-activity; sid:2049467; rev:5; metadata:affected_product Windows_XP_Vista_7_8_10_Server_32_64_Bit, attack_target Client_Endpoint, created_at 2023_12_04, deployment Perimeter, malware_family Socks5Systemz, performance_impact Low, confidence High, signature_severity Critical, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2024_04_07; target:src_ip;)