Open redirect: chkc.com.hk

calendar Aug 5, 2025  ยท
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Message contains use of the chkc.com.hk open redirect. This has been exploited in the wild.

Sublime rule (View on GitHub)

 1name: "Open redirect: chkc.com.hk"
 2description: |
 3    Message contains use of the chkc.com.hk open redirect. This has been exploited in the wild.
 4type: "rule"
 5severity: "medium"
 6source: |
 7  type.inbound
 8  and any(body.links,
 9          .href_url.domain.root_domain == 'chkc.com.hk'
10          and strings.icontains(.href_url.path, 'ViewSwitcher/SwitchView')
11          and strings.icontains(.href_url.query_params, 'returnUrl=')
12  )
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  )  
22attack_types:
23  - "Credential Phishing"
24  - "Malware/Ransomware"
25tactics_and_techniques:
26  - "Open redirect"
27detection_methods:
28  - "Sender analysis"
29  - "URL analysis"
30id: "aa683479-478b-505d-9d4b-aec7da8423e8"
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