alert http $HOME_NET any -> $EXTERNAL_NET any (msg:"ET USER_AGENTS ErbiumStealer UA Observed"; flow:established,to_server; http.user_agent; content:"Erbium-UA-"; startswith; fast_pattern; reference:url,twitter.com/3xp0rtblog/status/1556256431904546816; classtype:trojan-activity; sid:2038482; rev:2; metadata:affected_product Windows_XP_Vista_7_8_10_Server_32_64_Bit, attack_target Client_Endpoint, created_at 2022_08_09, deployment Perimeter, malware_family Erbium, confidence High, signature_severity Major, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2024_03_08, reviewed_at 2025_10_24;)