sublimelowRule

Brand impersonation: Vanta

Impersonation of Vanta.

MITRE ATT&CK

T1566 T1566.001 T1566.002 T1598 T1598.003 T1583.001

initial-access

Detection Query

type.inbound
and (
  regex.imatch(sender.display_name, '\bvanta\b')
  or regex.imatch(sender.email.local_part, '(\b)vanta|vanta(\b)')
  or strings.ilevenshtein(sender.email.domain.sld, 'vanta') <= 1
)
and not (
  strings.ilike(sender.display_name, '*advantage*')
  or strings.ilike(sender.email.email, '*advantage*')
  or strings.ilevenshtein(sender.email.domain.sld, 'advantage') <= 1
)
and sender.email.domain.root_domain in $free_email_providers
and sender.email.email not in $sender_emails

// negate highly trusted sender domains unless they fail DMARC authentication
and (
  (
    sender.email.domain.root_domain in $high_trust_sender_root_domains
    and not headers.auth_summary.dmarc.pass
  )
  or sender.email.domain.root_domain not in $high_trust_sender_root_domains
)

Author

itsRobPicard

Data Sources

Email MessagesEmail HeadersEmail Attachments

Platforms

Raw Content

name: "Brand impersonation: Vanta"
description: |
  Impersonation of Vanta.
type: "rule"
severity: "low"
authors:
  - twitter: "itsRobPicard"
source: |
  type.inbound
  and (
    regex.imatch(sender.display_name, '\bvanta\b')
    or regex.imatch(sender.email.local_part, '(\b)vanta|vanta(\b)')
    or strings.ilevenshtein(sender.email.domain.sld, 'vanta') <= 1
  )
  and not (
    strings.ilike(sender.display_name, '*advantage*')
    or strings.ilike(sender.email.email, '*advantage*')
    or strings.ilevenshtein(sender.email.domain.sld, 'advantage') <= 1
  )
  and sender.email.domain.root_domain in $free_email_providers
  and sender.email.email not in $sender_emails
  
  // negate highly trusted sender domains unless they fail DMARC authentication
  and (
    (
      sender.email.domain.root_domain in $high_trust_sender_root_domains
      and not headers.auth_summary.dmarc.pass
    )
    or sender.email.domain.root_domain not in $high_trust_sender_root_domains
  )


attack_types:
  - "Credential Phishing"
tactics_and_techniques:
  - "Impersonation: Brand"
  - "Lookalike domain"
  - "Social engineering"
detection_methods:
  - "Sender analysis"
id: "883d4382-11a6-5924-9e3e-2cb5a11c3f56"