Versions (4)
Version DetailsCurrent
Rev: 1 • Mar 26, 2021, 12:00 PMET MALWARE Cobalt Strike Beacon Activity (GET)
alert http $HOME_NET any -> $EXTERNAL_NET any (msg:"ET MALWARE Cobalt Strike Beacon Activity (GET)"; flow:established,to_server; http.method; content:"GET"; http.uri; content:"/Forums?listinfo="; fast_pattern; startswith; http.cookie; content:"made_write_conn="; startswith; pcre:"/^(?:[A-Za-z0-9+/]{4})*(?:[A-Za-z0-9+/]{2}==|[A-Za-z0-9+/]{3}=|[A-Za-z0-9+/]{4})$/R"; http.header_names; content:!"Referer"; reference:md5,49ebd0be7e33c59ee584cb8601093775; classtype:trojan-activity; sid:2032338; rev:1; metadata:attack_target Client_Endpoint, created_at 2021_03_26, deployment Perimeter, deployment SSLDecrypt, confidence Medium, signature_severity Major, tag c2, updated_at 2021_03_26, mitre_tactic_id TA0010, mitre_tactic_name Exfiltration, mitre_technique_id T1041, mitre_technique_name Exfiltration_Over_C2_Channel;)
Mar 26, 2021, 12:00 PM
Mar 26, 2021, 12:00 PM
Sep 21, 2024, 3:00 AM
Sep 21, 2024, 3:00 AM
rules/emerging-malware.rules