ET MALWARE Win32/Valyria Maldoc Payload Request M1

alert http $HOME_NET any -> $EXTERNAL_NET any (
    msg:"ET MALWARE Win32/Valyria Maldoc Payload Request M1";
    flow:established,to_server;
    http.uri;
    content:"/IMG"; fast_pattern;
    content:".exe"; endswith;
    pcre:"/\/IMG[-_]?[0-9\-]{7,9}\.exe$/";
    http.user_agent;
    content:"Microsoft-CryptoAPI/"; startswith;
    http.host;
    pcre:"/^[0-9]{1,3}.[0-9]{1,3}.[0-9]{1,3}.[0-9]{1,3}$/";
    http.header_names;
    content:!"|0d 0a|Referer|0d 0a|";
    reference:url,microsoft.com/en-us/wdsi/threats/malware-encyclopedia-description?Name=Trojan:VBS/Valyria;
    reference:url,community.emergingthreats.net/t/new-signature-for-valyria/203;
    classtype:trojan-activity;
    sid:2042658; rev:1;
    metadata:affected_product Windows_XP_Vista_7_8_10_Server_32_64_Bit, attack_target Client_Endpoint, created_at 2022_12_12, deployment Perimeter, deployment SSLDecrypt, malware_family Win32_Valyria, confidence High, signature_severity Major, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2022_12_12, reviewed_at 2025_10_24;
)