sublimemediumRule

Open redirect: events.csiro.au

Message contains use of the events.csiro.au redirect. This has been exploited in the wild.

MITRE ATT&CK

T1566 T1566.001 T1566.002 T1598 T1204.002 T1486

Detection Query

type.inbound
and any(body.links,
        .href_url.domain.domain == "events.csiro.au"
        and strings.icontains(.href_url.query_params, '&ec_url=')
        and not regex.icontains(.href_url.query_params,
                                '&ec_url=[^\&]*csiro\.au(?:\&|\/|$)'
        )
)
and not sender.email.domain.root_domain in ("csiro.au")

// negate highly trusted sender domains unless they fail DMARC authentication
and (
  (
    sender.email.domain.root_domain in $high_trust_sender_root_domains
    and not headers.auth_summary.dmarc.pass
  )
  or sender.email.domain.root_domain not in $high_trust_sender_root_domains
)

Data Sources

Email MessagesEmail HeadersEmail Attachments

Platforms

Raw Content

name: "Open redirect: events.csiro.au"
description: |
  Message contains use of the events.csiro.au redirect. This has been exploited in the wild.
type: "rule"
severity: "medium"
source: |
  type.inbound
  and any(body.links,
          .href_url.domain.domain == "events.csiro.au"
          and strings.icontains(.href_url.query_params, '&ec_url=')
          and not regex.icontains(.href_url.query_params,
                                  '&ec_url=[^\&]*csiro\.au(?:\&|\/|$)'
          )
  )
  and not sender.email.domain.root_domain in ("csiro.au")
  
  // negate highly trusted sender domains unless they fail DMARC authentication
  and (
    (
      sender.email.domain.root_domain in $high_trust_sender_root_domains
      and not headers.auth_summary.dmarc.pass
    )
    or sender.email.domain.root_domain not in $high_trust_sender_root_domains
  )
attack_types:
  - "Credential Phishing"
  - "Malware/Ransomware"
tactics_and_techniques:
  - "Open redirect"
detection_methods:
  - "Sender analysis"
  - "URL analysis"
id: "836f9a98-c3d4-54fc-8a4b-c91143cf705d"