Rule History

alert http $HOME_NET any -> $EXTERNAL_NET any (msg:"ET MALWARE SilentGrabber Exfil via Telegram (POST) M2"; flow:established,to_server; http.request_body; content:"|3c 2f|b|3e 20|got|20|a|20|new|20|victim|3a 20 3c|b|3e|a"; fast_pattern; content:"|3c|b|3e|IP|20|Info|3c 2f|b|3e|"; content:"|3c|b|3e|Grabbed|20|Info|3c 2f|b|3e|"; reference:md5,2c6dbadcc4df0a0ee079fc7ba14d07f8; classtype:trojan-activity; sid:2064049; 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;)