Open redirect: weblinkconnect.com

 1name: "Open redirect: weblinkconnect.com"
 2description: "Message contains use of the weblinkconnect.com open redirect, but the sender is not weblinkconnect.com. This has been exploited in the wild."
 3type: "rule"
 4severity: "medium"
 5source: |
 6  type.inbound
 7  and length(filter(body.links,
 8                    .href_url.domain.root_domain == 'weblinkconnect.com'
 9             )
10  ) < 10
11  and any(body.links,
12          .href_url.domain.domain == 'api-internal.weblinkconnect.com'
13          and strings.icontains(.href_url.path, "/click")
14          and strings.icontains(.href_url.query_params, "url=")
15  )
16  and sender.email.domain.root_domain != 'weblinkconnect.com'
17  and not any(headers.domains, .root_domain == "weblinkinternational.com")
18  // negate highly trusted sender domains unless they fail DMARC authentication
19  and not (
20    sender.email.domain.root_domain in $high_trust_sender_root_domains
21    and coalesce(headers.auth_summary.dmarc.pass, false)
22  )  
23attack_types:
24  - "Credential Phishing"
25tactics_and_techniques:
26  - "Evasion"
27  - "Open redirect"
28detection_methods:
29  - "Sender analysis"
30  - "URL analysis"
31id: "967f7a11-d2f0-51ff-a2c4-02ffcc40ebb2"