Detection rules › Sublime MQL

New sender domain (<=10d) from untrusted sender

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

Detects inbound emails where the sender domain is less than 10 days old from untrusted senders.

Event coverage

Message attribute
sender.email
type

Rule body MQL

type.inbound
and network.whois(sender.email.domain).days_old <= 10
and not profile.by_sender().solicited

Detection logic

Scope: inbound message.

Detects inbound emails where the sender domain is less than 10 days old from untrusted senders.

  1. inbound message
  2. network.whois(sender.email.domain).days_old ≤ 10
  3. not:
    • profile.by_sender().solicited

Inspects: sender.email.domain, type.inbound. Sensors: network.whois, profile.by_sender.