Open redirect: chkc.com.hk

calendar Sep 23, 2026  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 not (
16    sender.email.domain.root_domain in $high_trust_sender_root_domains
17    and coalesce(headers.auth_summary.dmarc.pass, false)
18  )  
19attack_types:
20  - "Credential Phishing"
21  - "Malware/Ransomware"
22tactics_and_techniques:
23  - "Open redirect"
24detection_methods:
25  - "Sender analysis"
26  - "URL analysis"
27id: "aa683479-478b-505d-9d4b-aec7da8423e8"
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