Rule History

alert http $HOME_NET any -> $EXTERNAL_NET any (msg:"ET MALWARE Cobalt Strike Related Activity (GET)"; flow:established,to_server; http.method; content:"GET"; http.uri; content:"/unsalted-condensed-soups/"; fast_pattern; pcre:"/^[A-Za-z0-9-_]{176}\//R"; content:".gif"; endswith; http.header_names; content:!"Referer"; reference:md5,efd53ce7f5935fe8e2d7d6b6126bf1a5; reference:url,unit42.paloaltonetworks.com/cobalt-strike-memory-analysis/; classtype:trojan-activity; sid:2042886; rev:1; metadata:attack_target Client_Endpoint, created_at 2022_12_14, deployment Perimeter, deployment SSLDecrypt, malware_family Cobalt_Strike, confidence Medium, signature_severity Major, updated_at 2022_12_14, mitre_tactic_id TA0011, mitre_tactic_name Command_And_Control, mitre_technique_id T1001, mitre_technique_name Data_Obfuscation;)