ET MALWARE GandCrab Style External IP Check (Spoofed Yahoo Host)

Query · suricata

flow:established,to_server;
http.start;
content:"GET / HTTP/1.1|0d 0a|Host|3a 20|yahoo.com|0d 0a|User-Agent|3a 20|Mozilla/5.0 (Windows NT 6.1|3b 20|WOW64|3b 20|Trident/7.0|3b 20|rv|3a|11.0) like Gecko|0d 0a|Cache-Control|3a 20|no-cache|0d 0a 0d 0a|"; bsize:142;
threshold:type both,track by_src, count 10, seconds 30;
Raw source ET MALWARE GandCrab Style External IP Check (Spoofed Yahoo Host) · Suricata
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Published by Emerging Threats Open ↗, licensed under BSD 3-Clause ↗. Line breaks added for readability; the rule is otherwise unchanged. 
alert http $HOME_NET any -> $EXTERNAL_NET any (
    msg:"ET MALWARE GandCrab Style External IP Check (Spoofed Yahoo Host)";
    flow:established,to_server;
    http.start;
    content:"GET / HTTP/1.1|0d 0a|Host|3a 20|yahoo.com|0d 0a|User-Agent|3a 20|Mozilla/5.0 (Windows NT 6.1|3b 20|WOW64|3b 20|Trident/7.0|3b 20|rv|3a|11.0) like Gecko|0d 0a|Cache-Control|3a 20|no-cache|0d 0a 0d 0a|"; bsize:142;
    threshold:type both,track by_src, count 10, seconds 30;
    classtype:trojan-activity;
    sid:2030168; rev:1;
    metadata:affected_product Windows_XP_Vista_7_8_10_Server_32_64_Bit, attack_target Client_Endpoint, created_at 2020_05_15, deployment Perimeter, malware_family GandCrab, confidence High, signature_severity Major, updated_at 2020_05_15;
)

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