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Create attachment_ics_meeting_invite.yml #3756

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14e4460
Create attachment_ics_meeting_invite.yml
MSAdministrator Jan 12, 2026
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Merge branch 'main' into msadministrator.new.NA.attachment_ics_meetin…
aidenmitchell Jan 12, 2026
9ba1612
Auto-format MQL and add rule IDs
Jan 12, 2026
6804bc8
Update attachment_ics_meeting_invite.yml
MSAdministrator Jan 14, 2026
583c8d9
Update attachment_ics_meeting_invite.yml
MSAdministrator Jan 20, 2026
29a395b
Update attachment_ics_meeting_invite.yml
MSAdministrator Jan 21, 2026
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Update attachment_ics_meeting_invite.yml
MSAdministrator Jan 23, 2026
234b786
Update detection-rules/attachment_ics_meeting_invite.yml
MSAdministrator Jan 23, 2026
a1be97c
Auto-format MQL and add rule IDs
Jan 23, 2026
ba5f6d3
Update attachment_ics_meeting_invite.yml
MSAdministrator Jan 23, 2026
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Update attachment_ics_meeting_invite.yml
MSAdministrator Jan 23, 2026
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23 changes: 23 additions & 0 deletions detection-rules/attachment_ics_meeting_invite.yml
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Original file line number Diff line number Diff line change
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name: "Attachment: ICS file with meeting prefix"
description: "Detects incoming messages with a single ICS calendar file attachment that has a filename starting with 'meeting_'."
type: "rule"
severity: "high"
source: |
type.inbound
and length(attachments) == 1
and any(filter(attachments,
.file_extension in~ ('ics')
or .content_type in ("application/ics", "text/calendar")
),
regex.icontains(.file_name, 'meeting_[a-zA-Z0-9]{5}\.')
and not .file_name == "meeting_invite.ics"
)
attack_types:
- "BEC/Fraud"
- "Credential Phishing"
tactics_and_techniques:
- "Social engineering"
detection_methods:
- "File analysis"
- "Header analysis"
id: "383a5810-0b85-55a8-ac9b-e7135823317b"
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