Open Redirect: events.csiro.au

 1name: "Open Redirect: events.csiro.au"
 2description: |
 3    Message contains use of the events.csiro.au 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.domain == "events.csiro.au"
10      and strings.icontains(.href_url.query_params, '&ec_url=')
11      and not regex.icontains(.href_url.query_params, '&ec_url=[^\&]*csiro\.au(?:\&|\/|$)')
12  )
13  and not sender.email.domain.root_domain in ("csiro.au")
14  
15  // negate highly trusted sender domains unless they fail DMARC authentication
16  and (
17    (
18      sender.email.domain.root_domain in $high_trust_sender_root_domains
19      and not headers.auth_summary.dmarc.pass
20    )
21    or sender.email.domain.root_domain not in $high_trust_sender_root_domains
22  )  
23attack_types:
24  - "Credential Phishing"
25  - "Malware/Ransomware"
26tactics_and_techniques:
27  - "Open redirect"
28detection_methods:
29  - "Sender analysis"
30  - "URL analysis"
31id: "836f9a98-c3d4-54fc-8a4b-c91143cf705d"