High Severity
Employee Impersonation: Payroll Fraud
Description
This rule detects messages impersonating employees, from unsolicited senders attempting to reroute payroll or alter payment details.
References
No references.
Sublime Security
Created Aug 17th, 2023 • Last updated Dec 16th, 2024
Feed Source
Sublime Core Feed
Source
type.inbound
// ensure the display name contains a space to avoid single named process accounts eg. 'billing, payment'
and strings.contains(sender.display_name, " ")
and sender.display_name in~ $org_display_names
and length(attachments) == 0
and length(body.links) < 10
and length(body.current_thread.text) < 800
and (
sender.email.domain.root_domain not in $org_domains
or sender.email.domain.root_domain in $free_email_providers
)
and 1 of (
regex.icontains(body.current_thread.text,
'(pay\s?(roll|check|date|day)|direct deposit|(acct|account) rephrase|paid.{0,50}problems|\bACH\b|\bdd\b|gehalt|salario|salary)'
),
regex.icontains(subject.subject,
'(pay\s?(roll|check|date|day)|direct deposit|(acct|account) rephrase|paid.{0,50}problems|\bACH\b|\bdd\b|gehalt|salario|salary)'
)
)
and (
not profile.by_sender_email().solicited
or (
profile.by_sender().any_messages_malicious_or_spam
and not profile.by_sender().any_false_positives
)
)
and not profile.by_sender().any_false_positives
// negate highly trusted sender domains unless they fail DMARC authentication
and (
(
sender.email.domain.root_domain in $high_trust_sender_root_domains
and (
any(distinct(headers.hops, .authentication_results.dmarc is not null),
strings.ilike(.authentication_results.dmarc, "*fail")
)
)
)
or sender.email.domain.root_domain not in $high_trust_sender_root_domains
)
Playground
Test against your own EMLs or sample data.