Open Redirect: documentmailbox.com

 1name: "Open Redirect: documentmailbox.com"
 2description: |
 3    Message contains use of the documentmailbox.com 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 == "documentmailbox.com"
10    and strings.icontains(.href_url.path, 'RedirectTarget.aspx')
11    and strings.icontains(.href_url.query_params, 'TargetUrl=')
12  )
13  
14  and length(filter(body.links,
15    .href_url.domain.root_domain == "documentmailbox.com"
16    and strings.icontains(.href_url.path, 'RedirectTarget.aspx')
17    and strings.icontains(.href_url.query_params, 'TargetUrl=')
18  )) == 1
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 not headers.auth_summary.dmarc.pass
25    )
26    or sender.email.domain.root_domain not in $high_trust_sender_root_domains
27  )  
28attack_types:
29  - "Credential Phishing"
30  - "Malware/Ransomware"
31tactics_and_techniques:
32  - "Open redirect"
33detection_methods:
34  - "Sender analysis"
35  - "URL analysis"
36id: "9b2e9179-ba77-5dc2-bc48-246f8e7e76da"