Open Redirect: api.spently.com

 1name: "Open Redirect: api.spently.com"
 2description: |
 3    Message contains use of the api.spently.com redirect. This has been exploited in the wild.
 4type: "rule"
 5severity: "medium"
 6source: |
 7  type.inbound
 8    // there are less than 10 unique links for api.spently.com within the body.links
 9  and length(distinct(filter(body.links, .href_url.domain.domain == "api.spently.com"), .href_url.url)) < 10
10  and any(body.links,
11          .href_url.domain.domain == "api.spently.com"
12          and strings.istarts_with(.href_url.path, '/api/spently/click')
13          and strings.icontains(.href_url.query_params, 'url=')
14          and strings.icontains(.href_url.query_params, 'type=')
15          and not regex.icontains(.href_url.query_params,
16                                    'url=(?:https?(?:%3a|:))?(?:%2f|\/){2}[^&]*spently\.com(?:\&|\/|$|%2f)'
17          )
18  )
19  and not sender.email.domain.root_domain == "spently.com"
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: "69740e97-265f-515b-b5ae-80ec234f07ac"