Sublime Security medium experimental mql
Open redirect: Club-OS
Message contains use of the Club-OS open redirect. This has been exploited in the wild.
Detection Logic
type.inbound
and any(body.links,
.href_url.domain.root_domain == "club-os.com"
and strings.icontains(.href_url.path, 'click')
and strings.icontains(.href_url.query_params, 'target=')
// negate hash lookup targets (not actor controlled)
and not (
regex.icontains(.href_url.query_params, 'target=[a-f0-9]{40}(?:$
| &)')
and strings.icontains(.href_url.query_params, '&hashLookup=true')
)
// negate urls that go back to club-os
and not regex.icontains(.href_url.query_params,
'target=[^\&]*club-os.com/'
)
)
// negate highly trusted sender domains unless they fail DMARC authentication
and (
(
sender.email.domain.root_domain in $high_trust_sender_root_domains
and not headers.auth_summary.dmarc.pass
)
or sender.email.domain.root_domain not in $high_trust_sender_root_domains
) Field Validations
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