alert http $EXTERNAL_NET any -> $HOME_NET any (msg:"ET MALWARE Cyborg Ransomware - Downloading Desktop Background"; flow:established,to_client; http.stat_code; content:"200"; http.server; bsize:8; content:"HotCores"; http.content_type; bsize:10; content:"image/jpeg"; http.header; content:"Content-Disposition|3a 20|inline|3b 20|filename=|22|Cyborg_DECRYPT.jpg|22 0d 0a|"; fast_pattern; reference:md5,2505b0efde03f5d3c66984e6f7c5bcc1; classtype:trojan-activity; sid:2029052; rev:1; metadata:affected_product Windows_XP_Vista_7_8_10_Server_32_64_Bit, attack_target Client_Endpoint, created_at 2019_11_25, deployment Perimeter, deployment SSLDecrypt, confidence High, signature_severity Major, tag Ransomware, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2019_11_25, mitre_tactic_id TA0040, mitre_tactic_name Impact, mitre_technique_id T1486, mitre_technique_name Data_Encrypted_for_Impact;)