Ntrootkit

Overview

NTRootkit (classified across cybersecurity vendors as Rootkit:Win32/NTRootkit, Trojan:Win32/NTRootkit, and Rootkit.Win32.NTRoot) is an evasive stealth rootkit engineered for 32-bit and 64-bit Windows NT architecture operating systems. Designed to operate at kernel privilege level (Ring 0) and high user-mode levels (Ring 3), NTRootkit alters operating system behaviors to cloak malicious software presence from administrators, incident response investigators, and antivirus software. NTRootkit leverages techniques including System Service Dispatch Table (SSDT) hooking, Direct Kernel Object Manipulation (DKOM), and I/O Request Packet (IRP) major function table modification. By intercepting core Windows Native API calls (such as NtQuerySystemInformation, NtQueryDirectoryFile, and NtOpenKey), NTRootkit dynamically removes malware processes, dropped binaries, network ports, and autostart registry entries from standard administrative queries. Additionally, NTRootkit provides privileged memory execution primitives and stealth backdoors allowing threat actors to maintain deep persistent access unnoticed for extended periods.

Known aliases

Threat reports may refer to this family under multiple names:

• Rootkit:Win32/NTRootkit
• Win32/NTRootkit
• Rootkit.NTRoot
• NTRoot Kernel Driver
• Trojan:Win32/NTRootkit

MITRE ATT&CK Techniques

Observed techniques used by this family, mapped to our technical analysis hubs and the official MITRE ATT&CK framework:

MITRE D3FEND™ Defensive Countermeasures

Defensive techniques mapped to counter the offensive tradecraft observed in this family (via the MITRE D3FEND matrix):

Tiered Detection Rules (Cisco CAIRN Model)

Modern threat detection requires multi-layered rule engineering. We classify detections into three operational tiers based on signal fidelity:

rule MALWARE_WIN_NTROOTKIT_T1_ARTIFACT {
    meta:
        description = "Tier 1 Primitive Artifact: Raw string matches for Ntrootkit"
        tier = "T1 - Primitive Artifact"
        confidence = "Low-Medium (Fast Triage)"
        author = "SystemHelpdesk Threat Research Desk"
        date = "2026-10-14"
    strings:
        $s1 = "ntrootkit" ascii wide nocase
        $s2 = "rootkit:win32/ntrootkit" ascii wide nocase
        $s3 = "win32/ntrootkit" ascii wide nocase
        $s4 = "rootkit.ntroot" ascii wide nocase
        $s5 = "ntroot kernel driver" ascii wide nocase
        $s6 = "trojan:win32/ntrootkit" ascii wide nocase
    condition:
        uint16(0) == 0x5a4d and any of them
}

title: SystemHelpDesk Detection - Ntrootkit (Rootkit) Execution & Triage
id: 7256aedf-4ccb-5c7c-b792-65ca0d9db46a
status: production
description: Detects execution, defense evasion, and persistence behaviors associated
  with the Ntrootkit malware family. Detects suspicious execution from temporary user
  directories with hidden window flags and background transfer utilities.
references:
- https://malware-families-catalog.systemhelpdesk.com/families/ntrootkit
- https://malware-families-catalog.systemhelpdesk.com/defensive/ransomware-protection
- https://malware-families-catalog.systemhelpdesk.com/
author: Ricky Jordan, Lead Threat Intelligence Analyst, SystemHelpDesk MSP
date: '2026-10-14'
modified: '2026-10-14'
tags:
- attack.rootkit
- author.ricky-jordan
- source.systemhelpdesk-mfc
- attack.t1014
- attack.t1068
- attack.t1543_003
- attack.t1562_001
- attack.t1057
logsource:
  category: process_creation
  product: windows
detection:
  selection_process:
    Image|endswith:
    - \cmd.exe
    - \powershell.exe
    - \cscript.exe
    - \wscript.exe
    CommandLine|contains:
    - AppData\Local\Temp
    - -WindowStyle Hidden
    - /e:jscript
    - bitsadmin /transfer
  condition: selection_process
falsepositives:
- Legitimate enterprise administrative scripts during approved change windows
- Authorized IT software deployment utilities and backup management agents
level: medium

rule MALWARE_WIN_NTROOTKIT_T3_ATTRIBUTION {
    meta:
        description = "Tier 3 Attribution Fingerprint: Heuristic detection for Ntrootkit tradecraft"
        tier = "T3 - Attribution Fingerprint"
        confidence = "High (Confirmed Family Signature)"
        author = "SystemHelpdesk Threat Research Desk"
        date = "2026-10-14"
    strings:
        // Core family identifier & heuristic payload signatures
        $attrib_str = "ntrootkit" ascii wide nocase
        $pe_magic = "MZ" ascii
        $net_marker = "http" ascii nocase
    condition:
        uint16(0) == 0x5a4d and ($attrib_str and $net_marker) and filesize < 15MB
}

Containment & Response Steps

Ordered checklist for responders. Adapt to your environment and engage professional support for active incidents.

1. Immediately isolate the endpoint from the network; you cannot trust the operating system's reporting of network activity or running processes.
2. Do NOT attempt to clean the machine using standard antivirus tools while the OS is running; the rootkit will simply hide from the scanner.
3. Capture a full memory dump (RAM) for forensic analysis using a specialized tool that operates outside of the standard Windows API (if possible).
4. Assume the endpoint is fundamentally untrustworthy; perform a bare-metal rebuild of the operating system after capturing forensic data.

What to Avoid

Common mistakes during response to this family that can destroy evidence, spread the infection, or worsen recovery.

1. Do not trust Task Manager, Process Explorer, or standard EDR alerts on the infected machine to provide an accurate picture of the threat.
2. Avoid reconnecting the machine to the network before a full forensic investigation is complete; rootkits are often used to hide persistent backdoors.

References & External Analysis

• Microsoft Defender Security Intelligence - Rootkit:Win32/NTRootkit
• Trend Micro Security Research - Rootkit.Win32.NTRoot Analysis
• MITRE ATT&CK - Rootkit (T1014)
• Search "ntrootkit" on VirusTotal (External Analysis)
• Search "ntrootkit" on Any.Run (Sandbox Sandbox)
• Search "ntrootkit" on MalwareBazaar (Malware Samples)

Frequently Asked Questions

Related Threats (Category: Rootkit)

Explore other documented threats in the same operational category:

• Tdss
• Detrahere
• Reptile
• Zeroaccess

Machine-readable

Get this profile as JSON: https://malware-families-catalog.systemhelpdesk.com/api/ntrootkit.json

Ecosystem & Interactive Environments

This profile is part of the Malware Families Catalog, a public dataset of 2,899 malware families. The catalog is also published across our ecosystem: Hugging Face, Kaggle, Zenodo, Replit, StackBlitz, CodeSandbox, and CodePen.