alert http $HOME_NET any -> $EXTERNAL_NET any (msg:"ET USER_AGENTS Suspicious User-Agent (REBOL)"; flow:established,to_server; http.user_agent; content:"REBOL"; nocase; startswith; reference:url,twitter.com/James_inthe_box/status/1441140639169609736; classtype:bad-unknown; sid:2034021; rev:2; metadata:affected_product Windows_XP_Vista_7_8_10_Server_32_64_Bit, attack_target Client_Endpoint, created_at 2021_09_24, deployment Perimeter, performance_impact Low, confidence High, signature_severity Minor, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2022_05_03;)