sublimemediumRule

Open redirect: weblinkconnect.com

Message contains use of the weblinkconnect.com open redirect, but the sender is not weblinkconnect.com. This has been exploited in the wild.

MITRE ATT&CK

T1566 T1566.001 T1566.002 T1598 T1036 T1027

defense-evasion

Detection Query

type.inbound
and length(filter(body.links,
                  .href_url.domain.root_domain == 'weblinkconnect.com'
           )
) < 10
and any(body.links,
        .href_url.domain.domain == 'api-internal.weblinkconnect.com'
        and strings.icontains(.href_url.path, "/click")
        and strings.icontains(.href_url.query_params, "url=")
)
and sender.email.domain.root_domain != 'weblinkconnect.com'
and not any(headers.domains, .root_domain == "weblinkinternational.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
)

Data Sources

Email MessagesEmail HeadersEmail Attachments

Platforms

Raw Content

name: "Open redirect: weblinkconnect.com"
description: "Message contains use of the weblinkconnect.com open redirect, but the sender is not weblinkconnect.com. This has been exploited in the wild."
type: "rule"
severity: "medium"
source: |
  type.inbound
  and length(filter(body.links,
                    .href_url.domain.root_domain == 'weblinkconnect.com'
             )
  ) < 10
  and any(body.links,
          .href_url.domain.domain == 'api-internal.weblinkconnect.com'
          and strings.icontains(.href_url.path, "/click")
          and strings.icontains(.href_url.query_params, "url=")
  )
  and sender.email.domain.root_domain != 'weblinkconnect.com'
  and not any(headers.domains, .root_domain == "weblinkinternational.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
  )
attack_types:
  - "Credential Phishing"
tactics_and_techniques:
  - "Evasion"
  - "Open redirect"
detection_methods:
  - "Sender analysis"
  - "URL analysis"
id: "967f7a11-d2f0-51ff-a2c4-02ffcc40ebb2"