alert http $HOME_NET any -> $EXTERNAL_NET any (msg:"ET MALWARE CopperStealer - Remote Desktop - Initial Checkin"; flow:established,to_server; http.method; content:"POST"; http.header; content:"x-csrftoken|3a 20|x|0d 0a|"; fast_pattern; http.content_type; content:"application/x-www-form-urlencoded"; bsize:33; http.request_body; content:"guid="; startswith; content:!"&"; distance:0; isdataat:!37,relative; reference:md5,cb39d19f07ea387b1f1dcd22f889545b; reference:md5,04bc575585d4663f227cef14a65bea26; reference:url,www.trendmicro.com/en_us/research/22/f/websites-hosting-fake-cracks-spread-updated-copperstealer.html; classtype:trojan-activity; sid:2037030; rev:1; metadata:attack_target Client_Endpoint, created_at 2022_06_17, deployment Perimeter, malware_family CopperStealer, confidence High, signature_severity Major, tag c2, updated_at 2022_06_17, mitre_tactic_id TA0011, mitre_tactic_name Command_And_Control, mitre_technique_id T1071, mitre_technique_name Application_Layer_Protocol;)