ET MALWARE UNK_MysteriousElephant CnC Checkin

Query · suricata

flow:established,to_server;
content:"|22|hostname|22 3a 22|";
content:"|22|mac|22 3a 22|";
pcre:"/^(?:[a-f0-9]{2}\x2d){5}[a-f0-9]{2}\x22/R";
content:"|22|macman|22 3a 22|"; fast_pattern;
content:"|22|username|22 3a 22|";
Raw source ET MALWARE UNK_MysteriousElephant CnC Checkin · Suricata
Esc
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 any (
    msg:"ET MALWARE UNK_MysteriousElephant CnC Checkin";
    flow:established,to_server;
    content:"|22|hostname|22 3a 22|";
    content:"|22|mac|22 3a 22|";
    pcre:"/^(?:[a-f0-9]{2}\x2d){5}[a-f0-9]{2}\x22/R";
    content:"|22|macman|22 3a 22|"; fast_pattern;
    content:"|22|username|22 3a 22|";
    reference:md5,43073b67b9c6c091bf0d0240df05ed04;
    classtype:trojan-activity;
    sid:2065234; rev:1;
    metadata:affected_product Windows_XP_Vista_7_8_10_Server_32_64_Bit, affected_product Windows_11, attack_target Client_and_Server, tls_state plaintext, created_at 2025_10_17, deployment Perimeter, performance_impact Low, confidence High, signature_severity Major, tag Description_Generated_By_Proofpoint_Nexus, tag UNK_MysteriousElephant, updated_at 2025_10_17, mitre_tactic_id TA0037, mitre_tactic_name Command_And_Control, mitre_technique_id T1041, mitre_technique_name Exfiltration_Over_C2_Channel;
)

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