Rule History

alert http $HOME_NET any -> $EXTERNAL_NET any (msg:"ET MALWARE BluStealer - SysInfo Exfil via Telegram M2"; flow:established,to_server; http.method; content:"POST"; http.host; content:"api.telegram.org"; bsize:16; http.uri; content:"/bot"; startswith; content:"/sendMessage"; endswith; http.request_body; content:"text=Passwords|3a 3a 3a|"; startswith; fast_pattern; content:"Username|3a 20|"; distance:0; content:"CompName|3a 20|"; distance:0; content:"Windows Version|3a 20|"; distance:0; content:"&chat_id="; distance:0; http.header_names; content:!"|0d 0a|Referer|0d 0a|"; reference:md5,b95798891c33a49b161c00f869877cd2; reference:url,decoded.avast.io/anhho/blustealer/; classtype:credential-theft; sid:2037261; rev:1; metadata:affected_product Windows_XP_Vista_7_8_10_Server_32_64_Bit, attack_target Client_Endpoint, created_at 2022_07_05, deployment Perimeter, deployment SSLDecrypt, malware_family BluStealer, performance_impact Low, confidence High, signature_severity Major, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2022_09_20, reviewed_at 2025_01_22;)