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Create evasion_hidden_content_gmail.yml #4642

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e329483
Create evasion_hidden_content_gmail.yml
D-Bolton Jun 9, 2026
4991405
Auto-format MQL and add rule IDs
Jun 9, 2026
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20 changes: 20 additions & 0 deletions detection-rules/evasion_hidden_content_gmail.yml
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name: "Evasion: Hidden content divs from Gmail sender"
description: "Detects inbound messages from Gmail sender containing multiple hidden HTML div elements with specific styling properties (display:none, opacity:0, zero dimensions) that are commonly used to evade content filtering and detection systems."
type: "rule"
severity: "medium"
source: |
type.inbound
and sender.email.domain.domain == 'gmail.com'
and strings.count(body.html.raw,
'<div style="display:none;opacity:0;width:0;height:0;overflow:hidden" aria-hidden="true">'
) >= 3
attack_types:
- "Credential Phishing"
tactics_and_techniques:
- "Evasion"
- "Free email provider"
detection_methods:
- "HTML analysis"
- "Content analysis"
- "Sender analysis"
id: "15548316-19ca-5f81-91d4-98a877bae765"
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