sublimemediumRule

Link: Google Cloud Storage with short-path link delivery

Detects inbound messages containing links to Google Cloud Storage (storage.googleapis.com) where the URL path ends in 'ls' or 'lis', matching a pattern used to host redirector or landing pages. Observed across multilingual spam and unsolicited promotional messages — including fake parcel delivery notifications impersonating FedEx and T&T, as well as product advertisement lures — sent from a variety of compromised or unrelated sender domains. The consistent use of this specific GCS path pattern suggests a shared delivery infrastructure across multiple senders.

MITRE ATT&CK

T1566 T1566.001 T1566.002 T1598 T1036 T1027 T1598.003

defense-evasioninitial-access

Detection Query

type.inbound
and any(body.links,
        .href_url.domain.domain == "storage.googleapis.com"
        // path ends with lis or ls
        and regex.icontains(.href_url.path, '^/[^\/]+/li?s$')
)

Data Sources

Email MessagesEmail HeadersEmail Attachments

Platforms

Raw Content

name: "Link: Google Cloud Storage with short-path link delivery"
description: "Detects inbound messages containing links to Google Cloud Storage (storage.googleapis.com) where the URL path ends in 'ls' or 'lis', matching a pattern used to host redirector or landing pages. Observed across multilingual spam and unsolicited promotional messages — including fake parcel delivery notifications impersonating FedEx and T&T, as well as product advertisement lures — sent from a variety of compromised or unrelated sender domains. The consistent use of this specific GCS path pattern suggests a shared delivery infrastructure across multiple senders."
type: "rule"
severity: "medium"
source: |
  type.inbound
  and any(body.links,
          .href_url.domain.domain == "storage.googleapis.com"
          // path ends with lis or ls
          and regex.icontains(.href_url.path, '^/[^\/]+/li?s$')
  )
attack_types:
  - "Spam"
  - "Credential Phishing"
tactics_and_techniques:
  - "Free file host"
  - "Evasion"
  - "Social engineering"
  - "Impersonation: Brand"
detection_methods:
  - "URL analysis"
  - "Content analysis"
id: "88a473bb-b8a1-59b7-ac54-24ec84424ac2"