alert http $HOME_NET any -> $EXTERNAL_NET any (msg:"ET MALWARE Possible Generic RAT over Telegram API"; flow:established,to_server; http.method; content:"GET"; http.uri; content:"Microsoft"; nocase; content:"Windows"; nocase; content:"Pass"; nocase; http.header; content:"|0d 0a|Host|3a 20|api.telegram.org|0d 0a|"; fast_pattern; classtype:command-and-control; sid:2029323; rev:2; metadata:affected_product Windows_XP_Vista_7_8_10_Server_32_64_Bit, attack_target Client_Endpoint, created_at 2020_01_27, deployment Perimeter, deployment SSLDecrypt, confidence Medium, signature_severity Major, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2020_10_27;)