alert http $HOME_NET any -> $EXTERNAL_NET any (msg:"ET MALWARE Cobalt Strike Activity (GET)"; flow:established,to_server; http.request_line; content:"GET /wp-includes/RELEASE.gif HTTP/1.1"; fast_pattern; http.user_agent; content:"Mozilla/5.0 (Linux|3b 20|Android 6.0|3b 20|HTC One X10 Build/MRA58K|3b 20|wv) AppleWebKit/537.36 (KHTML, like Gecko) Version/4.0"; bsize:113; http.header_names; content:"|0d 0a|Cache-Control|0d 0a|Host|0d 0a|Accept|0d 0a|User-Agent|0d 0a|Connection|0d 0a 0d 0a|"; bsize:57; reference:md5,07d3e518022aec38af7cb4cb709fd4e3; reference:md5,1cd603a9c0f9f251552e070d16591bef; classtype:trojan-activity; sid:2035389; rev:2; metadata:attack_target Client_Endpoint, created_at 2022_03_03, deployment Perimeter, malware_family Cobalt_Strike, confidence Medium, signature_severity Major, updated_at 2023_03_01, mitre_tactic_id TA0011, mitre_tactic_name Command_And_Control, mitre_technique_id T1001, mitre_technique_name Data_Obfuscation;)