ET MALWARE iMonitor EAM CnC Agent Request (*FILEHEADER*)

Query · suricata

flow:established,to_server;
flowbits:isset,ET.iMonitor.Checkin;
content:"|2a|FILEHEADER|2a 01|C|3a 5c|"; startswith; fast_pattern;
content:"|01|"; endswith;
threshold:type limit,count 1,seconds 300,track by_src;
target:src_ip;

Rule dependencies

⚠ Higher-order rule. It fires on other rules' alerts, not on raw events, so it cannot fire on its own. Deploy the rules it depends on too.

Depends on

Raw source ET MALWARE iMonitor EAM CnC Agent Request (*FILEHEADER*) · 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 iMonitor EAM CnC Agent Request (*FILEHEADER*)";
    flow:established,to_server;
    flowbits:isset,ET.iMonitor.Checkin;
    content:"|2a|FILEHEADER|2a 01|C|3a 5c|"; startswith; fast_pattern;
    content:"|01|"; endswith;
    threshold:type limit,count 1,seconds 300,track by_src;
    reference:url,x.com/Jane_0sint/status/1977826605767721158;
    reference:md5,447338af0ea5509735050add5ba9192a;
    classtype:command-and-control;
    sid:2065206; rev:1;
    metadata:affected_product Windows_XP_Vista_7_8_10_Server_32_64_Bit, attack_target Client_Endpoint, tls_state plaintext, created_at 2025_10_15, deployment Perimeter, malware_family iMonitor, confidence High, signature_severity Critical, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2025_10_15, mitre_tactic_id TA0011, mitre_tactic_name Command_And_Control, mitre_technique_id T1219, mitre_technique_name Remote_Access_Software;
    target:src_ip;
)

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