alert http $HOME_NET any -> $EXTERNAL_NET any (msg:"ET MALWARE DarkCrystal Rat Stealer Data Exfiltration Activity"; flow:established,to_server; http.method; content:"POST"; http.request_body; content:"|2d 2d 2d 2d 2d 2d 2d 2d 2d 2d 2d 2d|WebKitFormBoundary"; startswith; pcre:"/[A-Za-z0-9]{16}\x0d\x0a/Content|2d|Disposition|3a|/R"; content:"|0a 0d 0a 50 4b 03 04|"; within:450; content:"Information|20 5b|"; within:64; content:"|5d 2e|txt"; distance:2; within:5; content:"Screenshots|2f|Screenshot|23|DISPLAY"; fast_pattern; distance:512; within:200; reference:md5,19bbb1b94f66609cbd80945c14486e93; reference:url,cert.gov.ua/article/405538; classtype:trojan-activity; sid:2037132; rev:2; metadata:affected_product Windows_XP_Vista_7_8_10_Server_32_64_Bit, attack_target Client_Endpoint, created_at 2022_06_27, deployment Perimeter, deployment SSLDecrypt, malware_family DarkCrystal, confidence High, signature_severity Major, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2023_04_04, reviewed_at 2024_01_02;)