sublimemediumRule

Suspicious link to Looker Studio (lookerstudio.google.com) from a new and unsolicited sender

This rule detects messages containing links to lookerstudio with a non standard lookerstudio template from a new and unsolicited sender.

MITRE ATT&CK

T1566 T1566.001 T1566.002 T1598 T1036 T1027

defense-evasioninitial-access

Detection Query

type.inbound
and length(body.current_thread.text) < 1000
and regex.icontains(body.current_thread.text,
                    '(shared.{0,30}with you|View Document)'
)
and any(body.links, .href_url.domain.domain == "lookerstudio.google.com")
and (
  profile.by_sender().prevalence in ("new", "outlier")
  and not profile.by_sender().solicited
)

// 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: "Suspicious link to Looker Studio (lookerstudio.google.com) from a new and unsolicited sender"
description: "This rule detects messages containing links to lookerstudio with a non standard lookerstudio template from a new and unsolicited sender."
type: "rule"
severity: "medium"
source: |
  type.inbound
  and length(body.current_thread.text) < 1000
  and regex.icontains(body.current_thread.text,
                      '(shared.{0,30}with you|View Document)'
  )
  and any(body.links, .href_url.domain.domain == "lookerstudio.google.com")
  and (
    profile.by_sender().prevalence in ("new", "outlier")
    and not profile.by_sender().solicited
  )
  
  // 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"
tactics_and_techniques:
  - "Evasion"
  - "Social engineering"
detection_methods:
  - "Content analysis"
  - "Sender analysis"
  - "URL analysis"
id: "dbb50cb4-171f-532b-b820-906be09d03d6"