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Merged
D-Bolton merged 4 commits into from
Jan 9, 2026
Merged

Create sender_display_name_kindly.yml #3729

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71a6a16
new rule
D-Bolton Jan 5, 2026
6fd9e23
fix quotes
D-Bolton Jan 5, 2026
d899d93
Auto add rule ID
Jan 5, 2026
4bfe307
bump severity to high
D-Bolton Jan 9, 2026
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34 changes: 34 additions & 0 deletions detection-rules/sender_display_name_kindly.yml
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name: "Display name: 'kindly' with urgent language indicators"
description: "Detects messages where the sender's display name contains 'kindly' combined with urgent action words commonly used in social engineering attacks, such as urgent, ASAP, verify, confirm, or expedite."
type: "rule"
severity: "low"
source: |
type.inbound
and strings.icontains(sender.display_name, "kindly")
and (
strings.icontains(sender.display_name, 'cell number')
or strings.icontains(sender.display_name, 'expedite')
or strings.icontains(sender.display_name, 'urgent')
or strings.icontains(sender.display_name, 'contact number')
or strings.icontains(sender.display_name, 'review')
or strings.icontains(sender.display_name, 'confirm')
or strings.icontains(sender.display_name, 'ASAP')
or strings.icontains(sender.display_name, 'Follow Up')
or strings.icontains(sender.display_name, 'nicely')
or strings.icontains(sender.display_name, 'btc')
or strings.icontains(sender.display_name, 'Reply')
or strings.icontains(sender.display_name, 'RESPOND')
or strings.icontains(sender.display_name, 'URGENTLY')
or strings.icontains(sender.display_name, 'VERIFY')
or strings.icontains(sender.display_name, 'convenience')
or strings.icontains(sender.display_name, 'Response')
)

attack_types:
- "BEC/Fraud"
- "Credential Phishing"
tactics_and_techniques:
- "Social engineering"
detection_methods:
- "Sender analysis"
id: "82ca0ff1-e823-5930-aa2d-7d2b572a528b"