Open redirect: vconfex.com

 1name: "Open redirect: vconfex.com"
 2description: |
 3    Message contains use of the vconfex.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 == "vconfex.com"
10          and strings.istarts_with(.href_url.path, '/etl.php')
11          and strings.icontains(.href_url.query_params, 'url=')
12          and not regex.icontains(.href_url.query_params,
13                                  'url=(?:https?(?:%3a|:))?(?:%2f|\/){2}[^&]*vconfex\.com(?:\&|\/|$|%2f)'
14          )
15  )
16  and not sender.email.domain.root_domain == "vconfex.com"
17  // negate messages that also include an unsubscribe for vconfex
18  and not any(body.links,
19              .href_url.domain.root_domain == "vconfex.com"
20              and strings.istarts_with(.href_url.path, '/unsubscribe.php')
21  )
22  
23  // negate highly trusted sender domains unless they fail DMARC authentication
24  and (
25    (
26      sender.email.domain.root_domain in $high_trust_sender_root_domains
27      and not headers.auth_summary.dmarc.pass
28    )
29    or sender.email.domain.root_domain not in $high_trust_sender_root_domains
30  )  
31attack_types:
32  - "Credential Phishing"
33  - "Malware/Ransomware"
34tactics_and_techniques:
35  - "Open redirect"
36detection_methods:
37  - "Sender analysis"
38  - "URL analysis"
39id: "877de339-387a-5d7c-94ca-9094c484fe7b"