ET MALWARE GCleaner Downloader - Payload Response

Query · suricata

flow:established,to_client;
http.header;
content:"dllENCR.dll|22 3b 0d 0a|"; fast_pattern;
content:"Content-Transfer-Encoding|3a 20|binary|0d 0a|";
content:"Content-Type|3a 20|application/octet-stream|0d 0a|";
pcre:"/^Content-Disposition\x3a\x20attachment\x3b\x20filename\x3d\x22[a-zA-Z0-9]+dllENCR.dll\x22\x3b[\r\n]+$/mi";
Raw source ET MALWARE GCleaner Downloader - Payload Response · 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 -> $HOME_NET any (
    msg:"ET MALWARE GCleaner Downloader - Payload Response";
    flow:established,to_client;
    http.header;
    content:"dllENCR.dll|22 3b 0d 0a|"; fast_pattern;
    content:"Content-Transfer-Encoding|3a 20|binary|0d 0a|";
    content:"Content-Type|3a 20|application/octet-stream|0d 0a|";
    pcre:"/^Content-Disposition\x3a\x20attachment\x3b\x20filename\x3d\x22[a-zA-Z0-9]+dllENCR.dll\x22\x3b[\r\n]+$/mi";
    reference:md5,780099266c4cf79fbf344297b0a4e29e;
    classtype:trojan-activity;
    sid:2044037; rev:1;
    metadata:affected_product Windows_XP_Vista_7_8_10_Server_32_64_Bit, attack_target Client_Endpoint, created_at 2022_12_06, deployment Perimeter, malware_family GCleaner, performance_impact Low, confidence High, signature_severity Major, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2023_01_31, former_sid 2852925;
)

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