alert http $HOME_NET any -> $EXTERNAL_NET any (msg:"ET USER_AGENTS VPNFilter Related UA (Hakai/2.0)"; flow:established,to_server; http.user_agent; content:"Hakai/2.0"; startswith; fast_pattern; endswith; reference:url,twitter.com/m0rb/status/1021626709307805696; classtype:trojan-activity; sid:2025890; rev:5; metadata:attack_target Server, created_at 2018_07_25, deployment Perimeter, malware_family VPNFilter, performance_impact Low, confidence High, signature_severity Major, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2024_04_13;)