Detection rules › Sublime MQL

BEC/Fraud: Fake investment outreach from suspicious TLD

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

Detects fake investment solicitation emails using "Investment into {company}" subject lines from suspicious TLDs. This campaign targets businesses with templated cold outreach purporting to represent family offices or private equity firms, using disposable domains with DGA-like characteristics.

Threat classification

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

CategoryValues
Attack typesBEC/Fraud
Tactics and techniquesSocial engineering

Event coverage

Message attribute
sender.email
subject
type

Rule body MQL

type.inbound
and strings.istarts_with(subject.base, 'investment into')
and sender.email.domain.tld in $suspicious_tlds

Detection logic

Scope: inbound message.

Detects fake investment solicitation emails using "Investment into {company}" subject lines from suspicious TLDs. This campaign targets businesses with templated cold outreach purporting to represent family offices or private equity firms, using disposable domains with DGA-like characteristics.

  1. inbound message
  2. subject.base starts with 'investment into'
  3. sender.email.domain.tld in $suspicious_tlds

Inspects: sender.email.domain.tld, subject.base, type.inbound. Sensors: strings.istarts_with. Reference lists: $suspicious_tlds.

Indicators matched (1)

FieldMatchValue
strings.istarts_withprefixinvestment into