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WHOIS-Based Reputation-Hijacked (Inactive) Domain

It refers to a domain that was once legitimate and trusted, later expired or abandoned, then re-registered by threat actors for malicious use, but is currently inactive or offline. This indicates that the domain has completed its malicious lifecycle and is now dormant.

Analyst Q&A

What this signal answers

The questions every analyst asks before acting on this signal.

What it detects01

What does 'WHOIS-Based Reputation-Hijacked (Inactive) Domain' mean?

It refers to a domain that was once legitimate and trusted, later expired or abandoned, then re-registered by threat actors for malicious use, but is currently inactive or offline. This indicates that the domain has completed its malicious lifecycle and is now dormant.

Why it matters02

Why does inactivity matter in this context?

Inactive reputation-hijacked domains often represent defunct threat infrastructure. While no longer serving content, they remain valuable for threat hunting and historical correlation, as they may resurface under the same ownership or be reused in future campaigns.

How analysts use it03

How can SOC and CTI teams utilize this indicator?

Analysts should retain these inactive domains in watchlists for long-term monitoring. Even though they are currently offline, reactivation of such domains by the same WHOIS entity or hosting provider can signal the revival of known malicious infrastructure.

Often paired with:alert_only
Evidence shape

What WHOIS-Based Reputation-Hijacked (Inactive) Domain looks like in the response

A realistic shape of the entry the engine appends to the risk_signals array when this signal fires. Evidence keys are subgroup-default; per-signal overrides documented in the API reference.

json
{
  "slug": "whois_safely_aged_dead",
  "name": "WHOIS-Based Reputation-Hijacked (Inactive) Domain",
  "group": "whois",
  "subgroup": "age_lifecycle",
  "direction": "malicious",
  "evidence": {
    "registered_days_ago": 12,
    "last_transfer_days_ago": 0,
    "expiring_in_days": 360,
    "age_band": "newborn"
  }
}
See in API reference
Siblings

Peers in Age & Lifecycle

3 other signals share the same subgroup. They detect related behaviors and often co-fire on the same IOC.

Registered for 10+ Years

It indicates that the domain’s WHOIS record shows a long registration duration, typically 2, 5, or 10+ years. Such long-…

SafeCore
Dead Domain, Recently Expired

This label identifies dead (offline) domains that are either about to expire or have recently expired. Such domains are …

Malicious
Registered in Last Week

It indicates that the domain was registered very recently, within the last week, month, or few months. Newly registered …

Malicious

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