alert http $HOME_NET any -> $EXTERNAL_NET any (msg:"ET MALWARE Win32/Shuckworm CnC Exfil M2"; flow:established,to_server; http.uri; content:"/begun.php"; startswith; bsize:10; http.user_agent; content:"Mozilla/5.0 (Linux"; startswith; content:"::/.balance/."; endswith; fast_pattern; reference:url,symantec-enterprise-blogs.security.com/blogs/threat-intelligence/shuckworm-gamaredon-espionage-ukraine; classtype:trojan-activity; sid:2036292; rev:3; metadata:affected_product Windows_XP_Vista_7_8_10_Server_32_64_Bit, attack_target Client_Endpoint, created_at 2022_04_21, deployment Perimeter, malware_family Gamaredon, confidence High, signature_severity Major, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2023_03_14;)