ET RETIRED BellaCiao ASPX Backdoor Response

Query · suricata

flow:established,to_client;
flowbits:isset,ET.BellaCiao.UA;
http.stat_code;
content:"200";
http.header;
content:"Server|3a 20|Microsoft-IIS/";
file_data;
content:"|3c|HTML|3e 3c|HEAD|3e 3c|title|3e|invoice|3c 2f|title|3e 3c 2f|HEAD|3e 20 3c|body bgcolor|3d 22 23|808080|22 3e|Not Found |21 21 21 21 3c|div|3e 3c 2f|div|3e 3c 2f|body|3e 3c 2f|HTML|3e|"; fast_pattern;
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 RETIRED BellaCiao ASPX Backdoor Response · Suricata
Esc
Published by Emerging Threats Open ↗, licensed under BSD 3-Clause ↗. Line breaks added for readability; the rule is otherwise unchanged. 
alert http $HOME_NET any -> $EXTERNAL_NET any (
    msg:"ET RETIRED BellaCiao ASPX Backdoor Response";
    flow:established,to_client;
    flowbits:isset,ET.BellaCiao.UA;
    http.stat_code;
    content:"200";
    http.header;
    content:"Server|3a 20|Microsoft-IIS/";
    file_data;
    content:"|3c|HTML|3e 3c|HEAD|3e 3c|title|3e|invoice|3c 2f|title|3e 3c 2f|HEAD|3e 20 3c|body bgcolor|3d 22 23|808080|22 3e|Not Found |21 21 21 21 3c|div|3e 3c 2f|div|3e 3c 2f|body|3e 3c 2f|HTML|3e|"; fast_pattern;
    reference:md5,f56a6da833289f821dd63f902a360c31;
    reference:url,www.bitdefender.com/blog/businessinsights/unpacking-bellaciao-a-closer-look-at-irans-latest-malware/;
    classtype:trojan-activity;
    sid:2045977; rev:2;
    metadata:affected_product Microsoft_IIS, attack_target Web_Server, created_at 2023_05_31, deployment Perimeter, deployment SSLDecrypt, former_category MALWARE, malware_family BellaCiao, performance_impact Low, confidence High, signature_severity Major, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2024_10_01, reviewed_at 2024_10_01;
    target:src_ip;
)

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