Open Redirect: bestdeals.today

 1name: "Open Redirect: bestdeals.today"
 2description: |
 3    Message contains use of the bestdeals.today 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 == "bestdeals.today"
10      and strings.icontains(.href_url.path, '/redirect')
11      and regex.icontains(.href_url.query_params, '(?:^|&)url=')
12  )
13  and sender.email.domain.root_domain != 'bestdeals.today'
14  and headers.return_path.domain.root_domain != "bestdeals.today"
15
16  // negate highly trusted sender domains unless they fail DMARC authentication
17  and (
18    (
19      sender.email.domain.root_domain in $high_trust_sender_root_domains
20      and not headers.auth_summary.dmarc.pass
21    )
22    or sender.email.domain.root_domain not in $high_trust_sender_root_domains
23  )  
24attack_types:
25  - "Credential Phishing"
26  - "Malware/Ransomware"
27tactics_and_techniques:
28  - "Open redirect"
29detection_methods:
30  - "Sender analysis"
31  - "URL analysis"
32id: "666de100-4d0b-56ae-a6e8-b007ce31920f"