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Detection rules › Sublime MQL

Brand impersonation: Barracuda Networks

Severity
medium
Type
rule
Source
github.com/sublime-security/sublime-rules

Impersonation of Barracuda Networks, an IT security company.

Threat classification

Sublime's own taxonomy (not MITRE ATT&CK).

CategoryValues
Attack typesCredential Phishing
Tactics and techniquesImpersonation: Brand, Lookalike domain, Social engineering

Event coverage

Message attribute
sender
sender.email
type

Rule body MQL

type.inbound
and (
  strings.ilike(sender.display_name, '*barracuda*')
  or strings.ilevenshtein(sender.display_name, 'barracuda') <= 1
  or strings.ilike(sender.email.domain.domain, '*barracuda*')
)
and sender.email.domain.root_domain not in (
  'barracuda.com',
  'barracudamsp.com',
  'barracudanetworks.com',
  'netsuite.com',

  // hockey team
  'sharkssports.net',
  'sjbarracuda.com',

  // Barracuda Barcatering
  'barracuda-barcatering.de',

  // Barracuda Events Team
  'worldspan.co.uk',

  // Barracudas Day Camps
  'barracudas.co.uk',

  // BarracudaShoes
  'barracudashoes.it'
)
and (
  profile.by_sender().prevalence in ("new", "outlier")
  or (
    profile.by_sender().any_messages_malicious_or_spam
    and not profile.by_sender().any_messages_benign
  )
)

Detection logic

Scope: inbound message.

Impersonation of Barracuda Networks, an IT security company.

  1. inbound message
  2. any of:
    • sender.display_name matches '*barracuda*'
    • sender.display_name is similar to 'barracuda'
    • sender.email.domain.domain matches '*barracuda*'
  3. sender.email.domain.root_domain not in ('barracuda.com', 'barracudamsp.com', 'barracudanetworks.com', 'netsuite.com', 'sharkssports.net', 'sjbarracuda.com', 'barracuda-barcatering.de', 'worldspan.co.uk', 'barracudas.co.uk', 'barracudashoes.it')
  4. any of:
    • profile.by_sender().prevalence in ('new', 'outlier')
    • all of:
      • profile.by_sender().any_messages_malicious_or_spam
      • not:
        • profile.by_sender().any_messages_benign

Inspects: sender.display_name, sender.email.domain.domain, sender.email.domain.root_domain, type.inbound. Sensors: profile.by_sender, strings.ilevenshtein, strings.ilike.

Indicators matched (12)

FieldMatchValue
strings.ilikesubstring*barracuda*
strings.ilevenshteinfuzzybarracuda
sender.email.domain.root_domainmemberbarracuda.com
sender.email.domain.root_domainmemberbarracudamsp.com
sender.email.domain.root_domainmemberbarracudanetworks.com
sender.email.domain.root_domainmembernetsuite.com
sender.email.domain.root_domainmembersharkssports.net
sender.email.domain.root_domainmembersjbarracuda.com
sender.email.domain.root_domainmemberbarracuda-barcatering.de
sender.email.domain.root_domainmemberworldspan.co.uk
sender.email.domain.root_domainmemberbarracudas.co.uk
sender.email.domain.root_domainmemberbarracudashoes.it