alert http $HOME_NET any -> $EXTERNAL_NET any (msg:"ET HUNTING Telegram API Request (GET)"; flow:established,to_server; flowbits:set,ET.generictelegram; http.method; content:"GET"; http.uri; content:"/bot"; startswith; content:"|3a|"; distance:0; http.host; bsize:16; content:"api.telegram.org"; fast_pattern; http.header_names; to_lowercase; content:!"|0d 0a|referer|0d 0a|"; content:!"|0d 0a|user-agent|0d 0a|"; classtype:misc-activity; sid:2045615; rev:3; metadata:created_at 2023_05_08, confidence Medium, signature_severity Informational, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2024_04_30; target:src_ip;)