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Detection rules › Sublime MQL

DLP: Belgium National Number

Severity
high
Type
dlp
Source
github.com/sublime-security/sublime-rules

Detects messages containing Belgian National Numbers (Rijksregisternummer).

Event coverage

Message attribute
body.current_thread
subject
type

Rule body MQL

type.outbound
and any([body.current_thread.text, subject.subject],
        // Belgian National Number: YY.MM.DD-XXX.XX format (11 digits)
        regex.contains(., '\b\d{2}\.?\d{2}\.?\d{2}[\s\-]?\d{3}\.?\d{2}\b')
)
and any([body.current_thread.text, subject.subject],
        regex.icontains(., 'rijksregister|national\s+number|numéro\s+national')
)

Detection logic

Scope: outbound message.

Detects messages containing Belgian National Numbers (Rijksregisternummer).

  1. outbound message
  2. any of [body.current_thread.text, subject.subject] where:
    • . matches '\\b\\d{2}\\.?\\d{2}\\.?\\d{2}[\\s\\-]?\\d{3}\\.?\\d{2}\\b'
  3. any of [body.current_thread.text, subject.subject] where:
    • . matches 'rijksregister|national\\s+number|numéro\\s+national'

Inspects: body.current_thread.text, subject.subject, type.outbound. Sensors: regex.contains, regex.icontains.

Indicators matched (2)

FieldMatchValue
regex.containsregex\b\d{2}\.?\d{2}\.?\d{2}[\s\-]?\d{3}\.?\d{2}\b
regex.icontainsregexrijksregister|national\s+number|numéro\s+national