Open redirect: Dell

 1name: "Open redirect: Dell"
 2description: |
 3    Message contains use of the Dell open redirect, but the sender is not Dell.
 4type: "rule"
 5severity: "medium"
 6source: |
 7  type.inbound
 8  and any(body.links,
 9          .href_url.domain.domain == 't.em.home.dell.com'
10          and .href_url.path =~ '/r/'
11  )
12  and sender.email.domain.root_domain not in ('dell.com', 'dell.ca')
13  
14  // negate highly trusted sender domains unless they fail DMARC authentication
15  and (
16    (
17      sender.email.domain.root_domain in $high_trust_sender_root_domains
18      and not headers.auth_summary.dmarc.pass
19    )
20    or sender.email.domain.root_domain not in $high_trust_sender_root_domains
21  )  
22tags:
23  - "Attack surface reduction"
24attack_types:
25  - "Credential Phishing"
26  - "Malware/Ransomware"
27tactics_and_techniques:
28  - "Open redirect"
29detection_methods:
30  - "Sender analysis"
31  - "URL analysis"
32id: "718c2b0f-7ac3-5473-bb7c-12900b3da54a"