Rovnix

Overview

Trojan:Win32/Rovnix is a highly sophisticated bootkit and trojan downloader designed to infect the Master Boot Record (MBR) or Volume Boot Record (VBR) to achieve deep, undetectable persistence.

What is Rovnix?
For general users, Rovnix is invisible. For incident responders and forensic analysts, Rovnix represents one of the most difficult classes of malware to eradicate. By infecting the boot sector, Rovnix executes before the Windows operating system even loads. This allows it to patch the Windows kernel in memory, subvert all local security software, and load its malicious drivers completely undetected by standard anti-virus scanners.

Infection Vectors & Threat Hunting
Rovnix is typically distributed by other malware downloaders, exploit kits, or spearphishing campaigns. Upon execution, the installer drops a malicious driver (often highly obfuscated) that overwrites the VBR. Upon the next reboot, the bootkit loads into memory, hooks the INT 13h disk interrupt, and intercepts the OS loading process. Threat hunters cannot rely on file-level scanning to find Rovnix. Instead, they must hunt for anomalous outbound network connections to DGA domains (used to download secondary payloads like Carberp) or use specialized forensic tools to analyze the raw disk sectors.

Forensic Analysis & Impact
The primary impact of Rovnix is its ability to securely download and execute arbitrary secondary payloads while remaining completely hidden. Because it operates at Ring 0 (kernel level), it can intercept file system requests to hide its own components. Incident responders must perform offline forensic imaging (booting from a clean USB) to safely analyze the compromised MBR/VBR and extract the malicious driver payload for reverse engineering.

MITRE ATT&CK Techniques

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

Tactical Mitigations

Based on the techniques used by this family, consider the following defensive strategies:

• T1105: Implement network intrusion detection systems (NIDS) and host-based firewalls to block unauthorized inbound or outbound file transfers.

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_ROVNIX_T1_ARTIFACT {
    meta:
        description = "Tier 1 Primitive Artifact: Raw string matches for Rovnix"
        tier = "T1 - Primitive Artifact"
        confidence = "Low-Medium (Fast Triage)"
        author = "SystemHelpdesk Threat Research Desk"
        date = "2026-10-14"
    strings:
        $s1 = "rovnix" ascii wide nocase
    condition:
        uint16(0) == 0x5a4d and any of them
}

title: SystemHelpDesk Detection - Rovnix (Bootkit) Execution & Triage
id: 6b0817e2-0e51-5a67-896c-fac8f64839cf
status: production
description: Detects execution, defense evasion, and persistence behaviors associated
  with the Rovnix 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/rovnix
- 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.bootkit
- author.ricky-jordan
- source.systemhelpdesk-mfc
- attack.t1055_001
- attack.t1014
- attack.t1105
- attack.t1568_002
- attack.t1542_003
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_ROVNIX_T3_ATTRIBUTION {
    meta:
        description = "Tier 3 Attribution Fingerprint: Heuristic detection for Rovnix 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 = "rovnix" 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. Isolate the endpoint from the network to prevent the bootkit from downloading its secondary payloads.
2. Do not trust any telemetry, task manager, or local AV logs from the live system, as the kernel-level rootkit will spoof these results.
3. Perform a forensic triage by booting the machine from a known-clean Live CD or USB to image the raw disk and analyze the boot sectors.
4. To remediate, the OS must be entirely rebuilt, and the Master Boot Record (MBR) or EFI partition must be completely wiped and rewritten.

What to Avoid

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

1. Do not attempt a standard 'System Restore' or 'Reset this PC', as these mechanisms do not overwrite the infected boot sectors.
2. Avoid ignoring a Rovnix infection just because the system 'seems fine'; it is actively preparing the environment for a massive ransomware or banking trojan drop.

References & External Analysis

• Search "rovnix" on VirusTotal (External Analysis)
• Search "rovnix" on Any.Run (Sandbox Sandbox)
• Search "rovnix" on MalwareBazaar (Malware Samples)

Frequently Asked Questions

Related Threats (Category: Bootkit)

Explore other documented threats in the same operational category:

• Nemesis

Machine-readable

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