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, '&redirect=[^&]*secondstreetapp\.com')
13  )
14  // remove uses that originate from secondstreet
15  and not any(headers.domains, .root_domain in ("secondstreetmail.com", "secondstreetmessages.com"))
16  
17  // negate highly trusted sender domains unless they fail DMARC authentication
18  and (
19    (
20      sender.email.domain.root_domain in $high_trust_sender_root_domains
21      and not headers.auth_summary.dmarc.pass
22    )
23    or sender.email.domain.root_domain not in $high_trust_sender_root_domains
24  )  
25attack_types:
26  - "Credential Phishing"
27  - "Malware/Ransomware"
28tactics_and_techniques:
29  - "Open redirect"
30detection_methods:
31  - "Sender analysis"
32  - "URL analysis"
33id: "6767888d-c23f-5a7c-ad8f-a6959882d57f"