Open redirect: next2.io

calendar May 23, 2025  ยท
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Message contains use of a next.io redirect. This redirection has been abused by threat actors in the wild.

Sublime rule (View on GitHub)

 1name: "Open redirect: next2.io"
 2description: "Message contains use of a next.io redirect. This redirection has been abused by threat actors in the wild."
 3type: "rule"
 4severity: "medium"
 5source: |
 6  type.inbound
 7  and any(body.links,
 8          .href_url.domain.domain == "c.next2.io"
 9          and .href_url.path =~ "/api/ads"
10          and strings.icontains(.href_url.query_params, 'fallback_url=')
11  )
12  
13  // negate highly trusted sender domains unless they fail DMARC authentication
14  and (
15    (
16      sender.email.domain.root_domain in $high_trust_sender_root_domains
17      and not headers.auth_summary.dmarc.pass
18    )
19    or sender.email.domain.root_domain not in $high_trust_sender_root_domains
20  )  
21
22attack_types:
23  - "Credential Phishing"
24tactics_and_techniques:
25  - "Evasion"
26  - "Open redirect"
27  - "Social engineering"
28detection_methods:
29  - "Content analysis"
30  - "Header analysis"
31  - "Sender analysis"
32  - "URL analysis"
33id: "5085c422-6fce-5ce9-836b-d4834117e810"
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