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Enhance detection rules for SSA impersonation #3556

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Enhance detection rules for SSA impersonation #3556

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74b9a12
Enhance detection rules for SSA impersonation
peterdj45 Nov 20, 2025
c8c16cb
Update impersonation_social_security_admin.yml
peterdj45 Nov 20, 2025
805b6e7
Fix syntax for topic matching in YAML rule
peterdj45 Nov 21, 2025
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37 changes: 22 additions & 15 deletions detection-rules/impersonation_social_security_admin.yml
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Original file line number Diff line number Diff line change
Expand Up @@ -12,22 +12,28 @@ source: |
// there are confusables in the display name
or (
strings.replace_confusables(sender.display_name) != sender.display_name
and strings.contains(strings.replace_confusables(sender.display_name), "SSA")
and strings.contains(strings.replace_confusables(sender.display_name),
"SSA"
)
)
or any([sender.display_name, subject.subject],
regex.icontains(strings.replace_confusables(.), 'Social (?:benefits|security)', )
)
// display name or subject references a statement
or (
any([sender.display_name, subject.subject],
regex.icontains(strings.replace_confusables(.),
'(Digital|(e[[:punct:]]?))\s?Statements?.{0,10}(Generated|Created|Issued|Ready)'
)
)
// with SSA impersonation in the body
and strings.icontains(body.current_thread.text,
'Social Security Administration'
)
regex.icontains(strings.replace_confusables(.),
'Social (?:benefits|security)'
)
// display name or subject references a statement
or (
(
regex.icontains(strings.replace_confusables(.),
'(Digital|(e[[:punct:]]?))\s?Statements?.{0,10}(Generated|Created|Issued|Ready)'
)
// or the Login.gov SSO service
or strings.icontains(strings.replace_confusables(.), "login.gov")
)
// with SSA impersonation in the body
and strings.icontains(body.current_thread.text,
'Social Security Administration'
)
)
)
)
// Contains a link
Expand All @@ -39,7 +45,8 @@ source: |
// Additional suspicious indicator
and (
any(ml.nlu_classifier(body.current_thread.text).topics,
.name == "Secure Message" and .confidence == "high"
.name in ("Secure Message", "Government Services")
and .confidence == "high"
)
or strings.icontains(body.current_thread.text, "SSA Statement Viewer")
or strings.icontains(body.current_thread.text, "Social Security Statement")
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