ET MALWARE Observed UltraVNC CnC Activity

Query · suricata

flow:established,to_server;
dsize:12;
content:"RFB 003.008|0a|"; depth:12;
Raw source ET MALWARE Observed UltraVNC CnC Activity · 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 $HOME_NET any -> $EXTERNAL_NET 443 (
    msg:"ET MALWARE Observed UltraVNC CnC Activity";
    flow:established,to_server;
    dsize:12;
    content:"RFB 003.008|0a|"; depth:12;
    reference:md5,27741793672d8b69803f3d2434743731;
    reference:md5,076fd584d2fcdf5110f41bcbbd9f2c62;
    reference:md5,49749ee8fb2a2dab83494ab0e6cf5e7b;
    classtype:command-and-control;
    sid:2035893; rev:2;
    metadata:affected_product Windows_XP_Vista_7_8_10_Server_32_64_Bit, attack_target Client_Endpoint, created_at 2016_10_05, deployment Perimeter, malware_family UltraVNC, confidence Medium, signature_severity Major, tag c2, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2019_07_26, mitre_tactic_id TA0010, mitre_tactic_name Exfiltration, mitre_technique_id T1041, mitre_technique_name Exfiltration_Over_C2_Channel;
)

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