Open Redirect: buildingengines.com

 1name: "Open Redirect: buildingengines.com"
 2description: |
 3  Detects messages containing buildingengines.com redirect links that use the _redirectTo
 4  parameter to redirect users to malicious sites. This has been observed in phishing campaigns.  
 5type: "rule"
 6severity: "medium"
 7source: |
 8  type.inbound
 9  and any(body.links,
10          // Look for buildingengines URLs
11          .href_url.domain.domain == "app.buildingengines.com"
12          and strings.icontains(.href_url.query_params, '_redirectTo=')
13          // Make sure it's not redirecting back to buildingengines.com
14          and not regex.icontains(.href_url.query_params, '_redirectTo=(?:https?(?:%3a|:))?(?:%2f|\/){2}[^&]*buildingengines\.com(?:\&|\/|$|%2f)')
15  )
16  // Exclude legitimate Building Engines domains as senders
17  and not sender.email.domain.root_domain == "buildingengines.com"
18  
19  // negate highly trusted sender domains unless they fail DMARC authentication
20  and (
21    (
22      sender.email.domain.root_domain in $high_trust_sender_root_domains
23      and not headers.auth_summary.dmarc.pass
24    )
25    or sender.email.domain.root_domain not in $high_trust_sender_root_domains
26  )  
27attack_types:
28  - "Credential Phishing"
29  - "Malware/Ransomware"
30tactics_and_techniques:
31  - "Open redirect"
32detection_methods:
33  - "Sender analysis"
34  - "URL analysis"
35id: "93df711e-8aea-5bd9-952f-a80d616b0cf0"