Open redirect: YouTube

 1name: "Open redirect: YouTube"
 2description: |
 3    Looks for use of the YouTube open redirect coming from someone other than YouTube.
 4type: "rule"
 5severity: "medium"
 6authors:
 7  - twitter: "vector_sec"
 8source: |
 9  type.inbound
10  and any(body.links,
11          .href_url.domain.root_domain == "youtube.com"
12          and strings.icontains(.href_url.url, "attribution_link?")
13  )
14  and (
15    any(distinct(headers.hops, .authentication_results.dmarc is not null),
16        .authentication_results.dmarc_details.from.domain != "youtube.com"
17    )
18  )
19  
20  // negate highly trusted sender domains unless they fail DMARC authentication
21  and (
22    (
23      sender.email.domain.root_domain in $high_trust_sender_root_domains
24      and (
25        any(distinct(headers.hops, .authentication_results.dmarc is not null),
26            strings.ilike(.authentication_results.dmarc, "*fail")
27        )
28      )
29    )
30    or sender.email.domain.root_domain not in $high_trust_sender_root_domains
31  )
32  and (
33    not profile.by_sender().solicited
34    or profile.by_sender().any_messages_malicious_or_spam
35  )  
36
37tags:
38  - "Attack surface reduction"
39attack_types:
40  - "Credential Phishing"
41  - "Malware/Ransomware"
42tactics_and_techniques:
43  - "Open redirect"
44detection_methods:
45  - "Sender analysis"
46  - "URL analysis"
47id: "fb33bffe-d3db-5acb-ae19-5ddc6b5b0b01"