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Create impersonation_social_security_administration.yml #3077

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Create impersonation_social_security_admin.yml
ben-sublime Aug 13, 2025
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Aug 13, 2025
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43 changes: 43 additions & 0 deletions detection-rules/impersonation_social_security_admin.yml
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name: "Impersonation: Social Security Administration with secure message language"
description: "Detects messages impersonating the Social Security Administration (SSA) that contain links and use legitimate SSA terminology like 'Secure Message' or 'SSA Statement Viewer', but are sent from non-government domains by unsolicited or suspicious senders."
type: "rule"
severity: "medium"
source: |
type.inbound
and (
not profile.by_sender().solicited
or (
profile.by_sender().any_messages_malicious_or_spam
and not profile.by_sender().any_messages_benign
)
)
// Identifies as SSA without catching strings such as "Alyssa"
and (
regex.contains(sender.display_name, '^SSA\b')
or strings.icontains(sender.display_name, "Social Security Administration")
)
// Contains a link
and length(body.links) >= 1

// Not from a .gov domain
and not sender.email.domain.tld == ".gov"

// Secure messsage wording
and (
strings.icontains(body.current_thread.text, "Secure Message")
or strings.contains(body.current_thread.text, "SSA Statement Viewer")
// real SSA phone number
or strings.icontains(body.current_thread.text, "1-800-772-1213")
)

attack_types:
- "BEC/Fraud"
- "Credential Phishing"
tactics_and_techniques:
- "Impersonation: Brand"
- "Social engineering"
detection_methods:
- "Content analysis"
- "Sender analysis"
- "URL analysis"
id: "6196767e-6264-5833-96f3-d1e34424d7b5"