ET MALWARE MSIL/Crimson Rat CnC Server Response

Query · suricata

flow:established,to_client;
content:"|00 00 00|ent2rmezi="; offset:2; depth:13; fast_pattern;
threshold:type limit, track by_src, count 5, seconds 600;
Raw source ET MALWARE MSIL/Crimson Rat CnC Server Response · 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 tcp-pkt $EXTERNAL_NET 1024: -> $HOME_NET any (
    msg:"ET MALWARE MSIL/Crimson Rat CnC Server Response";
    flow:established,to_client;
    content:"|00 00 00|ent2rmezi="; offset:2; depth:13; fast_pattern;
    threshold:type limit, track by_src, count 5, seconds 600;
    reference:md5,3829791a486b0b9ccb80ffcb7177c19c;
    reference:url,twitter.com/0xrb/status/1515979150515122178;
    classtype:command-and-control;
    sid:2036242; rev:2;
    metadata:affected_product Windows_XP_Vista_7_8_10_Server_32_64_Bit, attack_target Client_Endpoint, created_at 2022_04_18, deployment Perimeter, malware_family Crimson, confidence High, signature_severity Major, tag c2, updated_at 2022_04_18, reviewed_at 2023_10_04;
)

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