Open redirect: Ticketmaster

 1name: "Open redirect: Ticketmaster"
 2description: |
 3    Message contains use of the Ticketmaster open redirect, but the sender is not Ticketmaster. This has been exploited in the wild.
 4references:
 5  - "https://www.reddit.com/r/cybersecurity/comments/127q4ny/ticketmaster_systems_exploited_for_phishing/"
 6type: "rule"
 7severity: "low"
 8source: |
 9  type.inbound
10  and any(body.links,
11          .href_url.domain.domain == 'links.engage.ticketmaster.com'
12          and .href_url.path =~ '/ctt'
13  )
14  and sender.email.domain.root_domain != 'ticketmaster.com'
15  and headers.return_path.domain.root_domain != "ticketmaster.com"
16  
17  // negate highly trusted sender domains unless they fail DMARC authentication
18  and (
19    (
20      sender.email.domain.root_domain in $high_trust_sender_root_domains
21      and not headers.auth_summary.dmarc.pass
22    )
23    or sender.email.domain.root_domain not in $high_trust_sender_root_domains
24  )  
25tags:
26  - "Attack surface reduction"
27attack_types:
28  - "Credential Phishing"
29  - "Malware/Ransomware"
30tactics_and_techniques:
31  - "Open redirect"
32detection_methods:
33  - "Sender analysis"
34  - "URL analysis"
35id: "a5b3901f-e57b-5fb9-a3d7-ee2205cc0c5b"