alert http $HOME_NET any -> $EXTERNAL_NET any (msg:"ET MALWARE Win32/Packed.BlackMoon.A CnC Checkin"; flow:established,to_server; http.request_line; content:"POST|20|/upload.php|20|"; http.request_body; content:"|2d 2d 2d 2d 2d 2d|WebKitFormBoundary"; startswith; fast_pattern; content:"Content|2d|Disposition|3a 20|form|2d|data|3b 20|name|3d 22|file|22 3b 20|filename|3d 22|blob|22|"; distance:0; content:"Content|2d|Disposition|3a 20|form|2d|data|3b 20|name|3d 22|blob|5f|num|22|"; distance:0; content:"Content|2d|Disposition|3a 20|form|2d|data|3b 20|name|3d 22|total|5f|blob|5f|num|22|"; distance:0; content:"Content|2d|Disposition|3a 20|form|2d|data|3b 20|name|3d 22|hashCode|22|"; distance:0; content:"Content|2d|Disposition|3a 20|form|2d|data|3b 20|name|3d 22|file|5f|name|22|"; distance:0; reference:md5,68149a86246195327250b78c5564f2b8; classtype:command-and-control; sid:2038500; rev:1; metadata:affected_product Windows_XP_Vista_7_8_10_Server_32_64_Bit, attack_target Client_Endpoint, created_at 2022_08_11, deployment Perimeter, malware_family Win32_Packed_BlackMoon_A, performance_impact Low, confidence Medium, signature_severity Major, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2022_08_11;)