Rule History

alert http $HOME_NET any -> $EXTERNAL_NET any (msg:"ET MALWARE 44Calibar Variant Exfil via Telegram"; flow:established,to_server; http.request_line; content:"POST /bot"; startswith; content:"/sendDocument"; distance:0; http.host; bsize:16; content:"api.telegram.org"; http.request_body; content:"name|3d|caption|0d 0a 0d 0a|"; content:"44CALIBER"; nocase; within:15; fast_pattern; content:"Grabbed Software|3a|"; distance:0; reference:md5,fc489c5343f6db7d1be798a3ee331bdf; classtype:command-and-control; sid:2033455; rev:1; metadata:attack_target Client_Endpoint, created_at 2021_07_27, deployment Perimeter, deployment SSLDecrypt, confidence High, signature_severity Major, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2021_07_27;)