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  and (
14    not profile.by_sender().solicited
15    or (
16      profile.by_sender().any_messages_malicious_or_spam
17      and not profile.by_sender().any_false_positives
18    )
19  )
20  
21  // negate highly trusted sender domains unless they fail DMARC authentication
22  and (
23    (
24      sender.email.domain.root_domain in $high_trust_sender_root_domains
25      and not headers.auth_summary.dmarc.pass
26    )
27    or sender.email.domain.root_domain not in $high_trust_sender_root_domains
28  )  
29tags:
30  - "Attack surface reduction"
31attack_types:
32  - "Credential Phishing"
33  - "Malware/Ransomware"
34tactics_and_techniques:
35  - "Open redirect"
36detection_methods:
37  - "Sender analysis"
38  - "URL analysis"
39id: "718c2b0f-7ac3-5473-bb7c-12900b3da54a"