ET MALWARE Observed Malicious Powershell Loader Payload Request (GET)

alert http $HOME_NET any -> $EXTERNAL_NET any (
    msg:"ET MALWARE Observed Malicious Powershell Loader Payload Request (GET)";
    flow:established,to_server;
    http.method;
    content:"GET";
    http.uri;
    content:"/atom.xml"; endswith; fast_pattern;
    http.user_agent;
    content:"WindowsPowerShell/";
    http.host;
    content:"blogspot.com"; endswith;
    reference:url,uptycs.com/blog/understanding-stealerium-malware-and-its-evasion-techniques;
    classtype:trojan-activity;
    sid:2047905; rev:1;
    metadata:affected_product Windows_XP_Vista_7_8_10_Server_32_64_Bit, attack_target Client_Endpoint, created_at 2023_09_05, deployment Perimeter, confidence High, signature_severity Major, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2023_09_07;
    target:src_ip;
)