sublimemediumRule

Service Abuse: Nifty.com with impersonation

Detects emails from nifty.com where the sender's local part matches a recipient's local part or organizational SLD, which has been observed in credential harvesting campaigns

MITRE ATT&CK

T1566 T1566.001 T1566.002 T1598

initial-access

Detection Query

type.inbound
and sender.email.domain.root_domain == "nifty.com"
and (
  sender.email.local_part in map(recipients.to, .email.local_part)
  or sender.email.local_part in $org_slds
)
and ml.nlu_classifier(body.current_thread.text).language != "japanese"

// and no false positives and not solicited
and not profile.by_sender_email().any_messages_benign

Data Sources

Email MessagesEmail HeadersEmail Attachments

Platforms

Raw Content

name: "Service Abuse: Nifty.com with impersonation"
description: "Detects emails from nifty.com where the sender's local part matches a recipient's local part or organizational SLD, which has been observed in credential harvesting campaigns"
type: "rule"
severity: "medium"
source: |
  type.inbound
  and sender.email.domain.root_domain == "nifty.com"
  and (
    sender.email.local_part in map(recipients.to, .email.local_part)
    or sender.email.local_part in $org_slds
  )
  and ml.nlu_classifier(body.current_thread.text).language != "japanese"
  
  // and no false positives and not solicited
  and not profile.by_sender_email().any_messages_benign
attack_types:
  - "Credential Phishing"
tactics_and_techniques:
  - "Spoofing"
detection_methods:
  - "Sender analysis"
id: "370cfdac-4976-59a1-ae1f-7cd5594eb958"