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Refactor link detection rules for Punycode characters #3502

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Merged
morriscode merged 1 commit into from
Nov 12, 2025
Merged

Refactor link detection rules for Punycode characters #3502

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21 changes: 4 additions & 17 deletions detection-rules/link_contains_punycode_characters.yml
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Original file line number Diff line number Diff line change
Expand Up @@ -9,26 +9,13 @@ authors:
severity: "medium"
source: |
type.inbound
and any(body.links, .href_url.domain.punycode is not null and .href_url.domain.valid == true)
and (
(
// include automated emails
sender.display_name == "WordPress"
or sender.email.local_part == "wordpress"
)

or (
(
profile.by_sender().prevalence in ("new", "outlier")
and not profile.by_sender().solicited
)
or (
profile.by_sender().any_messages_malicious_or_spam
and not profile.by_sender().any_messages_benign
)
any(body.links,
.href_url.domain.punycode is not null and .href_url.domain.valid == true
)
or any(body.links, strings.starts_with(.href_url.domain.domain, "xn--"))
)
and not profile.by_sender().any_messages_benign

tags:
- "Attack surface reduction"
attack_types:
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