sublimemediumRule

Service abuse: Roomsy with unrelated body content

Detects messages from Roomsy.com with a structured noreply sender pattern that contain content unrelated to travel, transportation, or order confirmations.

MITRE ATT&CK

T1566.002 T1534 T1656 T1566 T1566.001 T1598 T1598.003

initial-access

Detection Query

type.inbound
and sender.email.domain.root_domain == "roomsy.com"
and regex.imatch(sender.email.local_part, "noreply[0-9]{5}")
and not any(ml.nlu_classifier(body.current_thread.text).topics,
            .name in ("Travel and Transportation", "Order Confirmations")
)

Data Sources

Email MessagesEmail HeadersEmail Attachments

Platforms

Raw Content

name: "Service abuse: Roomsy with unrelated body content"
description: "Detects messages from Roomsy.com with a structured noreply sender pattern that contain content unrelated to travel, transportation, or order confirmations."
type: "rule"
severity: "medium"
source: |
  type.inbound
  and sender.email.domain.root_domain == "roomsy.com"
  and regex.imatch(sender.email.local_part, "noreply[0-9]{5}")
  and not any(ml.nlu_classifier(body.current_thread.text).topics,
              .name in ("Travel and Transportation", "Order Confirmations")
  )

attack_types:
  - "BEC/Fraud"
  - "Credential Phishing"
tactics_and_techniques:
  - "Impersonation: Brand"
  - "Social engineering"
detection_methods:
  - "Header analysis"
  - "Sender analysis"
  - "Natural Language Understanding"
id: "18e08a5a-6984-51b8-9e7f-8bdc21c32503"