Open redirect: secondstreetapp.com

 1name: "Open redirect: secondstreetapp.com"
 2description: |
 3    Message contains use of the secondstreetapp.com 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 == "secondstreetapp.com"
10          and strings.icontains(.href_url.query_params, '&redirect=')
11          // not redirects to themselves
12          and not regex.icontains(.href_url.query_params,
13                                  '&redirect=[^&]*secondstreetapp\.com'
14          )
15  )
16  // remove uses that originate from secondstreet
17  and not any(headers.domains,
18              .root_domain in ("secondstreetmail.com", "secondstreetmessages.com")
19  )
20  
21  // negate highly trusted sender domains unless they fail DMARC authentication
22  and (
23    (
24      sender.email.domain.root_domain in $high_trust_sender_root_domains
25      and not headers.auth_summary.dmarc.pass
26    )
27    or sender.email.domain.root_domain not in $high_trust_sender_root_domains
28  )  
29attack_types:
30  - "Credential Phishing"
31  - "Malware/Ransomware"
32tactics_and_techniques:
33  - "Open redirect"
34detection_methods:
35  - "Sender analysis"
36  - "URL analysis"
37id: "6767888d-c23f-5a7c-ad8f-a6959882d57f"