Detection rules › Sublime MQL

Link: Numeric IP obfuscation in URL

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

Detects inbound messages containing links where the host is a numeric-only IP representation, commonly used to bypass domain-based URL filtering.

Threat classification

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

CategoryValues
Attack typesCredential Phishing, Malware/Ransomware
Tactics and techniquesEvasion

Event coverage

Rule body MQL

type.inbound
and any(body.links, regex.icontains(.href_url.url, 'https?://[0-9]{7,12}/.+'))

Detection logic

Scope: inbound message.

Detects inbound messages containing links where the host is a numeric-only IP representation, commonly used to bypass domain-based URL filtering.

  1. inbound message
  2. any of body.links where:
    • .href_url.url matches 'https?://[0-9]{7,12}/.+'

Inspects: body.links, body.links[].href_url.url, type.inbound. Sensors: regex.icontains.

Indicators matched (1)

FieldMatchValue
regex.icontainsregexhttps?://[0-9]{7,12}/.+