ET MALWARE Possible HijackLoader Second Stage PNG Retrieval

Query · suricata

flow:established,to_client;
file.data;
content:"|89|PNG|0d 0a 1a 0a|"; startswith;
content:"IDAT|c6 a5 79 ea|"; within:50; fast_pattern;
target:dest_ip;
Raw source ET MALWARE Possible HijackLoader Second Stage PNG Retrieval · 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 http $EXTERNAL_NET any -> $HOME_NET any (
    msg:"ET MALWARE Possible HijackLoader Second Stage PNG Retrieval";
    flow:established,to_client;
    file.data;
    content:"|89|PNG|0d 0a 1a 0a|"; startswith;
    content:"IDAT|c6 a5 79 ea|"; within:50; fast_pattern;
    reference:url,www.crowdstrike.com/blog/hijackloader-expands-techniques/;
    reference:url,www.rapid7.com/blog/post/2023/08/31/fake-update-utilizes-new-idat-loader-to-execute-stealc-and-lumma-infostealers/;
    reference:url,blog.morphisec.com/unveiling-uac-0184-the-remcos-rat-steganography-saga;
    classtype:trojan-activity;
    sid:2051761; rev:1;
    metadata:affected_product Windows_XP_Vista_7_8_10_Server_32_64_Bit, affected_product Windows_11, attack_target Client_Endpoint, tls_state TLSDecrypt, created_at 2024_03_21, deployment Perimeter, deployment SSLDecrypt, performance_impact Low, confidence Low, signature_severity Major, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2024_03_21;
    target:dest_ip;
)

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