alert http $HOME_NET any -> $EXTERNAL_NET any (msg:"ET MALWARE TeleBots VBS Backdoor CnC Beacon 2"; flow:established,to_server; http.method; content:"GET"; http.uri; content:"?-----BEGIN|20|CERTIFICATE-----"; fast_pattern; content:"-----END|20|CERTIFICATE-----"; distance:0; pcre:"/END\x20CERTIFICATE-----$/"; http.header_names; content:!"Referer|0d 0a|"; reference:url,www.welivesecurity.com/2016/12/13/rise-telebots-analyzing-disruptive-killdisk-attacks/; classtype:command-and-control; sid:2023656; rev:3; metadata:affected_product Windows_XP_Vista_7_8_10_Server_32_64_Bit, attack_target Client_Endpoint, created_at 2016_12_16, deployment Perimeter, malware_family TeleBots_payload, signature_severity Major, tag c2, updated_at 2020_08_03, mitre_tactic_id TA0010, mitre_tactic_name Exfiltration, mitre_technique_id T1041, mitre_technique_name Exfiltration_Over_C2_Channel;)