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Create attachment_html_with_long_timeout.yml #2245

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Create attachment_html_with_long_timeout.yml #2245

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9dfdfd8
Create attachment_html_with_long_timeout.yml
morriscode Dec 24, 2024
9074e47
Auto add rule ID
Dec 24, 2024
53f6205
Update attachment_html_with_long_timeout.yml
morriscode Dec 24, 2024
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27 changes: 27 additions & 0 deletions detection-rules/attachment_html_with_long_timeout.yml
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Original file line number Diff line number Diff line change
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name: "Attachment: HTML file with abnormally long timeout"
description: "Detects inbound messages containing HTML attachments that use abnormally long setTimeout functions as a potential sandbox evasion technique."
type: "rule"
severity: "high"
source: |
type.inbound
and any(attachments,
(
.file_extension in~ ("html", "htm", "shtml", "dhtml")
or .file_type == "html"
)
and regex.icontains(file.parse_html(.).raw,
'setTimeout\(\(\) =>.*?\d{4}\);'
)
)
and not headers.return_path.domain.root_domain == "phriendlyphishing.com"
attack_types:
- "Malware/Ransomware"
- "Credential Phishing"
tactics_and_techniques:
- "HTML smuggling"
- "Scripting"
detection_methods:
- "File analysis"
- "HTML analysis"
- "Header analysis"
id: "dc11f4fe-480f-5136-b02d-c69c5a65f85e"
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