Open Redirect: LinkedIn Redirect

calendar Oct 10, 2024  ·
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Message contains use of a LinkedIn Redirect. The redirect contains a 3 second delay before redirecting the browser. This redirection has been abused by threat actors in the wild.

Sublime rule (View on GitHub)

 1name: "Open Redirect: LinkedIn Redirect"
 2description: |
 3    Message contains use of a LinkedIn Redirect. The redirect contains a 3 second delay before redirecting the browser. This redirection has been abused by threat actors in the wild.
 4type: "rule"
 5severity: "medium"
 6source: |
 7  type.inbound
 8  and any(body.links,
 9          .href_url.domain.root_domain == "linkedin.com"
10          and .href_url.path =~ "/redir/redirect"
11          and strings.icontains(.href_url.query_params, 'url=')
12  
13  )
14  and (
15    not profile.by_sender().solicited
16    or (
17      profile.by_sender().any_messages_malicious_or_spam
18      and not profile.by_sender().any_false_positives
19    )
20  )
21  
22  // negate highly trusted sender domains unless they fail DMARC authentication
23  and (
24    (
25      sender.email.domain.root_domain in $high_trust_sender_root_domains
26      and not headers.auth_summary.dmarc.pass
27    )
28    or sender.email.domain.root_domain not in $high_trust_sender_root_domains
29  )  
30attack_types:
31  - "Credential Phishing"
32  - "Malware/Ransomware"
33tactics_and_techniques:
34  - "Open redirect"
35detection_methods:
36  - "Sender analysis"
37  - "URL analysis"
38id: "4ad2d505-4ca7-5201-bd78-6ae92cffb228"
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