Medium Severity
Open Redirect: convertcart.com
Description
Message contains use of the convertcart.com redirect. This has been exploited in the wild.
References
No references.
Sublime Security
Created Feb 24th, 2025 • Last updated Feb 24th, 2025
Feed Source
Sublime Core Feed
Source
type.inbound
// convertcart is used in benign messages, however, they commonly have many links
// ensure messages contain less than 10 links convertcart.com to ensure higher fidelity matching of malicious messages
and length(filter(body.links, .href_url.domain.root_domain == "convertcart.com")) < 10
and any(body.links,
.href_url.domain.root_domain == "convertcart.com"
and strings.iends_with(.href_url.path, '/click')
and strings.icontains(.href_url.query_params, 'url=')
and not regex.icontains(.href_url.query_params,
'url=(?:https?(?:%3a|:))?(?:%2f|\/){2}[^&]*convertcart\.com(?:\&|\/|$|%2f)'
)
and not strings.icontains(.href_url.query_params,
sender.email.domain.root_domain
)
)
// remove uses that originate from convertcart.com
and not any(headers.domains, .root_domain in ("convertcart.com", "convertc.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
)
Playground
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