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Create abuse_google_drive_exessive_cc.yml #3692

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Create abuse_google_drive_exessive_cc.yml #3692

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Create abuse_google_drive_exessive_cc.yml
IndiaAce Dec 17, 2025
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Dec 17, 2025
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34 changes: 34 additions & 0 deletions detection-rules/abuse_google_drive_exessive_cc.yml
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name: "Service abuse: Google Drive shares with excessive CC recipients and credential theft language"
description: "Detects messages from legitimate Google Drive sharing addresses that contain credential theft language and either have more than 30 CC recipients from different domains or use undisclosed recipients, indicating potential abuse of Google's trusted sending reputation."
type: "rule"
severity: "medium"
source: |
type.inbound
// using legit google sender
and sender.email.email in (
'[email protected]',
'[email protected]',
)
// length of cc'd
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@IndiaAce IndiaAce Dec 17, 2025

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Suggested change
// length of cc'd
// length of cc'd recipients is > 30, not all the same, or unidsclosed recipients

and (
(
length(recipients.cc) > 30
and not length(distinct(recipients.cc, .email.domain.root_domain)) == 1
)
or all(recipients.to, .display_name == "Undisclosed recipients")
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@IndiaAce IndiaAce Dec 17, 2025

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There's a better way to do this where you by checking for valid recipient domains... will look into adding that check.

)
and any(ml.nlu_classifier(body.current_thread.text).intents,
.name == "cred_theft"
)

attack_types:
- "Credential Phishing"
tactics_and_techniques:
- "Impersonation: Brand"
- "Social engineering"
detection_methods:
- "Content analysis"
- "Header analysis"
- "Natural Language Understanding"
- "Sender analysis"
id: "19dc6f1c-4c46-5dc5-b2ee-a594e768d79b"