sublimemediumRule

Open redirect: LinkedIn Redirect

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.

MITRE ATT&CK

T1566 T1566.001 T1566.002 T1598 T1204.002 T1486

Detection Query

type.inbound
and any(body.links,
        .href_url.domain.root_domain == "linkedin.com"
        and .href_url.path =~ "/redir/redirect"
        and strings.icontains(.href_url.query_params, 'url=')
        and not any(.href_url.query_params_decoded["url"],
                    strings.parse_url(.).domain.root_domain in (
                      "lnkd.in",
                      'linkedin.com'
                    )
        )
)

// negate highly trusted sender domains unless they fail DMARC authentication
and (
  (
    sender.email.domain.root_domain in $high_trust_sender_root_domains
    and not headers.auth_summary.dmarc.pass
  )
  or sender.email.domain.root_domain not in $high_trust_sender_root_domains
)

Data Sources

Email MessagesEmail HeadersEmail Attachments

Platforms

Raw Content

name: "Open redirect: LinkedIn Redirect"
description: |
  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.
type: "rule"
severity: "medium"
source: |
  type.inbound
  and any(body.links,
          .href_url.domain.root_domain == "linkedin.com"
          and .href_url.path =~ "/redir/redirect"
          and strings.icontains(.href_url.query_params, 'url=')
          and not any(.href_url.query_params_decoded["url"],
                      strings.parse_url(.).domain.root_domain in (
                        "lnkd.in",
                        'linkedin.com'
                      )
          )
  )
  
  // negate highly trusted sender domains unless they fail DMARC authentication
  and (
    (
      sender.email.domain.root_domain in $high_trust_sender_root_domains
      and not headers.auth_summary.dmarc.pass
    )
    or sender.email.domain.root_domain not in $high_trust_sender_root_domains
  )
attack_types:
  - "Credential Phishing"
  - "Malware/Ransomware"
tactics_and_techniques:
  - "Open redirect"
detection_methods:
  - "Sender analysis"
  - "URL analysis"
id: "4ad2d505-4ca7-5201-bd78-6ae92cffb228"