alert http $HOME_NET any -> $EXTERNAL_NET any (msg:"ET MALWARE Cobalt Strike Activity (GET)"; flow:established,to_server; http.request_line; content:"GET /googleapi HTTP/1.1"; fast_pattern; http.referer; content:"http|3a 2f 2f|code.google.com/"; bsize:23; http.host; pcre:"/^\d{1,3}\.\d{1,3}\.\d{1,3}\.\d{1,3}$/"; http.header_names; content:"|0d 0a|Accept|0d 0a|Accept-Language|0d 0a|Referer|0d 0a|Accept-Encoding|0d 0a|User-Agent|0d 0a|Host|0d 0a|"; reference:md5,f7ac5192404c8dea43fdeedf01d1d66e; reference:url,twitter.com/malwrhunterteam/status/1476211484103524366; classtype:trojan-activity; sid:2034849; rev:2; metadata:attack_target Client_Endpoint, created_at 2021_12_30, deployment Perimeter, malware_family Cobalt_Strike, confidence Medium, signature_severity Major, updated_at 2023_02_23, mitre_tactic_id TA0011, mitre_tactic_name Command_And_Control, mitre_technique_id T1001, mitre_technique_name Data_Obfuscation;)