sublimehighRule

Open redirect: Nested Doubleclick.net

Doubleclick.net link leveraging a nested doubleclick.net open redirect from a new or outlier sender. The unusual behavior of nesting a doubleclick URL inside another doubleclick link warrants increasing the severity of this rule.

MITRE ATT&CK

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

Detection Query

type.inbound
and length(body.links) < 10
and any(body.links,
        .href_url.domain.root_domain == "doubleclick.net"
        and (
          strings.icontains(.href_url.path, "/aclk")
          or strings.icontains(.href_url.path, "/pcs/click")
          or strings.icontains(.href_url.path, "/searchads/link/click")
        )
        and regex.icontains(.href_url.query_params,
                            '&(?:adurl|ds_dest_url)=(?:https?(\:|%3a))?(?:\/|%2f)(?:\/|%2f)adclick.g.doubleclick.net'
        )
)

Data Sources

Email MessagesEmail HeadersEmail Attachments

Platforms

Raw Content

name: "Open redirect: Nested Doubleclick.net"
description: "Doubleclick.net link leveraging a nested doubleclick.net open redirect from a new or outlier sender. The unusual behavior of nesting a doubleclick URL inside another doubleclick link warrants increasing the severity of this rule."
type: "rule"
severity: "high"
source: |
  type.inbound
  and length(body.links) < 10
  and any(body.links,
          .href_url.domain.root_domain == "doubleclick.net"
          and (
            strings.icontains(.href_url.path, "/aclk")
            or strings.icontains(.href_url.path, "/pcs/click")
            or strings.icontains(.href_url.path, "/searchads/link/click")
          )
          and regex.icontains(.href_url.query_params,
                              '&(?:adurl|ds_dest_url)=(?:https?(\:|%3a))?(?:\/|%2f)(?:\/|%2f)adclick.g.doubleclick.net'
          )
  )
attack_types:
  - "Credential Phishing"
  - "Malware/Ransomware"
tactics_and_techniques:
  - "Open redirect"
detection_methods:
  - "Sender analysis"
  - "URL analysis"
id: "bbed5cc6-4c39-5a53-9255-269cbd4e27cb"