alert http $HOME_NET any -> $EXTERNAL_NET any (msg:"ET MALWARE Win32/Blacklegion Ransomware CnC Checkin"; flow:established,to_server; http.method; content:"GET"; http.uri; content:"|2a 2a|Unique|2b|ID"; fast_pattern; content:"|2a 2a|Personal|2b|ID"; http.host; bsize:16; content:"api.telegram.org"; reference:md5,9e37d89756eee8d24edecde880c2711a; reference:url,twitter.com/suyog41/status/1736713012747419681; classtype:trojan-activity; sid:2049718; rev:2; metadata:affected_product Windows_XP_Vista_7_8_10_Server_32_64_Bit, attack_target Client_Endpoint, created_at 2023_12_18, deployment Perimeter, deployment SSLDecrypt, malware_family Win32_Blacklegion, confidence High, signature_severity Critical, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2024_03_27;)