Rule History

alert http $HOME_NET any -> $EXTERNAL_NET any (msg:"ET MALWARE FIN12 Related ICECANDLE/Cobalt Strike Activity (GET)"; flow:established,to_server; http.method; content:"GET"; http.uri; content:"/wp-includes/admin.gif"; fast_pattern; bsize:22; http.header_names; content:"|0d 0a|Host|0d 0a|Cache-Control|0d 0a|User-Agent|0d 0a|Connection|0d 0a 0d 0a|"; bsize:49; reference:md5,256fa0ae50b4e199b631047f2fe98b58; reference:url,www.mandiant.com/resources/fin12-ransomware-intrusion-actor-pursuing-healthcare-targets; classtype:trojan-activity; sid:2034181; rev:1; metadata:attack_target Client_Endpoint, created_at 2021_10_13, deployment Perimeter, deployment SSLDecrypt, malware_family Fin12, confidence Medium, signature_severity Major, tag c2, updated_at 2021_10_13, mitre_tactic_id TA0010, mitre_tactic_name Exfiltration, mitre_technique_id T1041, mitre_technique_name Exfiltration_Over_C2_Channel;)