Rule History

alert http $HOME_NET any -> $EXTERNAL_NET any (msg:"ET MALWARE SilentGrabber Exfil via Telegram (POST) M1"; flow:established,to_server; http.method; content:"POST"; http.uri; content:"/bot"; startswith; http.host; content:"api.telegram.org"; endswith; http.request_body; content:"name|3d 22|file|22 3b 20|filename|3d 22|sendDocument|22|"; content:"name|3d 22|document|22 3b 20|filename|3d 22|Silent|2d|"; fast_pattern; content:".rar|0d 0a|"; distance:0; content:"|0d 0a 52 61 72|"; distance:0; reference:md5,2c6dbadcc4df0a0ee079fc7ba14d07f8; classtype:trojan-activity; sid:2064048; rev:1; metadata:affected_product Windows_XP_Vista_7_8_10_Server_32_64_Bit, attack_target Client_Endpoint, tls_state TLSDecrypt, created_at 2025_08_19, deployment Perimeter, deployment SSLDecrypt, malware_family SilentGrabber, confidence High, signature_severity Critical, tag c2, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2025_08_19, mitre_tactic_id TA0011, mitre_tactic_name Command_And_Control, mitre_technique_id T1071, mitre_technique_name Application_Layer_Protocol; target:src_ip;)