sublimemediumRule

Service abuse: SendThisFile with credential theft and financial language

Detects messages from sendthisfile.com containing credential theft language combined with financial communications topics.

MITRE ATT&CK

T1566.002 T1534 T1656 T1566 T1566.001 T1598

initial-access

Detection Query

type.inbound
and sender.email.domain.root_domain == "sendthisfile.com"
and any(ml.nlu_classifier(body.current_thread.text).intents,
        .name == "cred_theft" and .confidence != "low"
)
and any(ml.nlu_classifier(body.current_thread.text).topics,
        .name == "Financial Communications" and .confidence != "low"
)
// not a reply or forward
and (headers.in_reply_to is null or length(headers.references) == 0)

Data Sources

Email MessagesEmail HeadersEmail Attachments

Platforms

Raw Content

name: "Service abuse: SendThisFile with credential theft and financial language"
description: "Detects messages from sendthisfile.com containing credential theft language combined with financial communications topics."
type: "rule"
severity: "medium"
source: |
  type.inbound
  and sender.email.domain.root_domain == "sendthisfile.com"
  and any(ml.nlu_classifier(body.current_thread.text).intents,
          .name == "cred_theft" and .confidence != "low"
  )
  and any(ml.nlu_classifier(body.current_thread.text).topics,
          .name == "Financial Communications" and .confidence != "low"
  )
  // not a reply or forward
  and (headers.in_reply_to is null or length(headers.references) == 0)

attack_types:
  - "BEC/Fraud"
  - "Credential Phishing"
tactics_and_techniques:
  - "Free file host"
  - "Social engineering"
detection_methods:
  - "Content analysis"
  - "Natural Language Understanding"
  - "Sender analysis"
id: "c1ebf25b-0707-504f-b041-e7c27dfa9f05"