ET MALWARE Possible Raspberry Robin Activity (GET) M3

alert http $HOME_NET any -> $EXTERNAL_NET any (
    msg:"ET MALWARE Possible Raspberry Robin Activity (GET) M3";
    flow:established,to_server;
    urilen:43;
    http.method;
    content:"GET";
    http.uri;
    content:"/apps/Samples/thumb/sample"; startswith; fast_pattern;
    pcre:"/^(?:\d{2})\x2ejpg\x3f(?:\d{10})$/R";
    http.referer;
    content:"/cgi-bin/"; endswith;
    http.accept;
    content:"image/png"; startswith;
    http.user_agent;
    content:"Mozilla|2f|5|2e|0|20 28|Windows|20|NT|20|6|2e|1|3b 20|Trident|2f|7|2e|0|3b 20|rv|3a|11|2e|0|29 20|like|20|Gecko"; bsize:61;
    reference:md5,d89c574b4afdaadfd345177dd8f5c177;
    classtype:trojan-activity;
    sid:2047013; rev:1;
    metadata:affected_product Windows_XP_Vista_7_8_10_Server_32_64_Bit, attack_target Client_Endpoint, created_at 2023_08_01, deployment Perimeter, malware_family RaspberryRobin, confidence Low, signature_severity Critical, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2023_08_01;
)