ET MALWARE MSIL/Crimson Rat CnC Exfil

Query · suricata

flow:established,to_server;
content:"|00 00 00|ent4rme"; offset:2; depth:10; fast_pattern;
content:"|20 7c 20|"; distance:0;
content:"|23|runtimebroker"; distance:0;
threshold:type limit, track by_src, count 5, seconds 600;
Raw source ET MALWARE MSIL/Crimson Rat CnC Exfil · Suricata
Esc
Published by Emerging Threats Open ↗, licensed under BSD 3-Clause ↗. Line breaks added for readability; the rule is otherwise unchanged. 
alert tcp-pkt $HOME_NET any -> $EXTERNAL_NET 1024: (
    msg:"ET MALWARE MSIL/Crimson Rat CnC Exfil";
    flow:established,to_server;
    content:"|00 00 00|ent4rme"; offset:2; depth:10; fast_pattern;
    content:"|20 7c 20|"; distance:0;
    content:"|23|runtimebroker"; distance:0;
    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:2036241; 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, mitre_tactic_id TA0010, mitre_tactic_name Exfiltration, mitre_technique_id T1041, mitre_technique_name Exfiltration_Over_C2_Channel;
)

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