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  and length(filter(body.links,
14                    .href_url.domain.root_domain == "documentmailbox.com"
15                    and strings.icontains(.href_url.path, 'RedirectTarget.aspx')
16                    and strings.icontains(.href_url.query_params, 'TargetUrl=')
17             )
18  ) == 1
19  
20  // negate highly trusted sender domains unless they fail DMARC authentication
21  and not (
22    sender.email.domain.root_domain in $high_trust_sender_root_domains
23    and coalesce(headers.auth_summary.dmarc.pass, false)
24  )  
25attack_types:
26  - "Credential Phishing"
27  - "Malware/Ransomware"
28tactics_and_techniques:
29  - "Open redirect"
30detection_methods:
31  - "Sender analysis"
32  - "URL analysis"
33id: "9b2e9179-ba77-5dc2-bc48-246f8e7e76da"