Rule History

alert http $HOME_NET any -> $EXTERNAL_NET any (msg:"ET MALWARE WallStealer Data Exfiltration Attempt over Telegram"; flow:established,to_server; http.method; content:"POST"; http.uri; content:"/bot"; startswith; content:"/sendDocument"; endswith; http.host; content:"telegram"; http.request_body; content:"Content-Disposition|3a 20|form-data|3b 20|name|3d 22|document|22 3b 20|filename|3d 22|"; content:".zip|22|"; within:100; content:"Content-Type|3a 20|application/zip"; within:40; content:"PK|03 04|"; distance:0; content:"Browser|2f|JsonFormat|2f|logs.txt"; pcre:"/^\x5b\d{4}\x2d\d{2}\x2d\d{2}\x20\d{2}\x3a\d{2}\x3a\d{2}\x5d/R"; content:"|5b 2a 5d 20|Starting|20|multi|2d|browser|20|extraction"; distance:0; fast_pattern; content:"UserInformation.txt"; distance:0; reference:md5,cb6e677a00a47c9274ceb774acced905; classtype:trojan-activity; sid:2065905; rev:1; metadata:affected_product Windows_XP_Vista_7_8_10_Server_32_64_Bit, affected_product Windows_11, attack_target Client_Endpoint, created_at 2025_11_25, deployment Perimeter, malware_family WallStealer, confidence High, signature_severity Major, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2025_11_25, mitre_tactic_id TA0009, mitre_tactic_name Collection, mitre_technique_id T1005, mitre_technique_name Data_from_local_system; target:src_ip;)