ET HUNTING SUSPICIOUS PSHELL Downloader Primitives B644W Oct 19 2017

alert http $EXTERNAL_NET any -> $HOME_NET any (
    msg:"ET HUNTING SUSPICIOUS PSHELL Downloader Primitives B644W Oct 19 2017";
    flow:established,from_server;
    file_data;
    content:"UwB0AGEAcgB0AC0AUAByAG8AYwBlAHMAc";
    pcre:"/(?:RABvAHcAbgBsAG8AYQBkAEYAaQBsAG|QAbwB3AG4AbABvAGEAZABGAGkAbABl|EAG8AdwBuAGwAbwBhAGQARgBpAGwAZ)/";
    pcre:"/(?:VwByAGkAdABlAC0ASABvAHMAd|cAcgBpAHQAZQAtAEgAbwBzAH|XAHIAaQB0AGUALQBIAG8AcwB0)/";
    pcre:"/(?:UwB5AHMAdABlAG0ALgBOAGUAdAAuAFcAZQBiAEMAbABpAGUAbgB0|MAeQBzAHQAZQBtAC4ATgBlAHQALgBXAGUAYgBDAGwAaQBlAG4Ad|TAHkAcwB0AGUAbQAuAE4AZQB0AC4AVwBlAGIAQwBsAGkAZQBuAH)/";
    classtype:trojan-activity;
    sid:2024881; rev:2;
    metadata:affected_product Windows_XP_Vista_7_8_10_Server_32_64_Bit, attack_target Client_Endpoint, created_at 2017_10_20, deployment Perimeter, malware_family Locky, performance_impact Low, confidence Medium, signature_severity Major, updated_at 2019_07_26;
)