sublimemediumRule

Service abuse: Settime.io sender with callback scam intent

Detects inbound messages from noreply@settime.io that exhibit callback scam characteristics, as identified by natural language understanding with medium or high confidence. Settime.io is a scheduling service that can be abused to send fraudulent messages prompting recipients to call a phone number controlled by threat actors.

MITRE ATT&CK

T1566.003 T1598 T1566

initial-access

Detection Query

type.inbound
and sender.email.email == "noreply@settime.io"
and any(ml.nlu_classifier(body.current_thread.text).intents,
        .name == "callback_scam" and .confidence != "low"
)

Data Sources

Email MessagesEmail HeadersEmail Attachments

Platforms

Raw Content

name: "Service abuse: Settime.io sender with callback scam intent"
description: "Detects inbound messages from noreply@settime.io that exhibit callback scam characteristics, as identified by natural language understanding with medium or high confidence. Settime.io is a scheduling service that can be abused to send fraudulent messages prompting recipients to call a phone number controlled by threat actors."
type: "rule"
severity: "medium"
source: |
  type.inbound
  and sender.email.email == "noreply@settime.io"
  and any(ml.nlu_classifier(body.current_thread.text).intents,
          .name == "callback_scam" and .confidence != "low"
  )
attack_types:
  - "Callback Phishing"
tactics_and_techniques:
  - "Social engineering"
  - "Out of band pivot"
detection_methods:
  - "Sender analysis"
  - "Natural Language Understanding"
id: "116464d4-f054-5736-96d4-286ba2d4861f"