Neksminer
Table of Contents
Overview
NeksMiner (cataloged across security intelligence feeds under signatures including Trojan:Win32/NeksMiner, CoinMiner:Win32/NeksMiner, and Trojan.NeksMiner) is a covert cryptocurrency mining trojan active since 2017. Distributed through trojanized software keygens, cracked game repacks, and malicious torrent archives, NeksMiner stealthily hijacks host CPU and GPU resources to mine privacy-centric cryptocurrencies such as Monero (XMR). Upon infection, NeksMiner injects open-source XMRig mining payloads into legitimate Windows processes (such as svchost.exe or conhost.exe) or executes hidden background services. It actively monitors for Windows Task Manager, Process Hacker, and Process Explorer, instantly throttling or terminating mining threads when analysis tools are launched to avoid user detection, before resuming full mining operations once monitoring utilities are closed.
Known aliases
Threat reports may refer to this family under multiple names:
Family Pedigree & Lineage
Malware authors regularly fork and iterate upon existing codebases. Observed upstream lineage and downstream variants for this family include:
Derived From / Upstream Ancestry: Xmrig Open Source Monero Miner
Known Derivatives & Downstream Variants: Coinminer:Win32/Neksminer.A · Trojan:Win32/Neksminer.B
MITRE ATT&CK Techniques
This family has been observed using the following ATT&CK techniques: T1496 · T1055 · T1562.001 · T1082 · T1547.001
MITRE D3FEND™ Defensive Countermeasures
Defensive techniques mapped to counter the offensive tradecraft observed in this family (via the MITRE D3FEND matrix):
| D3FEND ID | Countermeasure Name | Tactic | Countered ATT&CK | Defensive Guidance |
|---|---|---|---|---|
D3-PIAD | Process Injection Analysis & Detection | Detect | T1055 | Monitor cross-process thread creation (CreateRemoteThread) and asynchronous procedure calls (QueueUserAPC). |
D3-SDA | System Discovery Analysis | Detect | T1082 | Alert on rapid enumerations of systeminfo, hostname, and registry hardware trees in short intervals. |
D3-PEA | Processor Execution Auditing | Detect | T1496 | Alert on sustained high CPU/GPU utilization by processes originating from temporary user directories and block stratum mining pool ports. |
D3-RPM | Registry Persistence Monitoring | Detect | T1547.001 | Audit and restrict write privileges to user and machine-level Registry Run/RunOnce keys using Endpoint Privilege Management. |
D3-STA | Security Tool Anti-Tamper Enforcement | Harden | T1562.001 | Block unauthorized modification of antivirus registry flags and prevent stopping security agent services. |
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:
Tier 1 Primitive Artifact Rule (Fast Triage)
Matches raw strings and file markers. Vulnerable to binary repacking and simple obfuscation.
rule MALWARE_WIN_NEKSMINER_T1_ARTIFACT {
meta:
description = "Tier 1 Primitive Artifact: Raw string matches for Neksminer"
tier = "T1 - Primitive Artifact"
confidence = "Low-Medium (Fast Triage)"
author = "SystemHelpdesk Threat Research Desk"
date = "2026-10-14"
strings:
$s1 = "neksminer" ascii wide nocase
$s2 = "trojan:win32/neksminer" ascii wide nocase
$s3 = "coinminer:win32/neksminer" ascii wide nocase
$s4 = "trojan.neksminer" ascii wide nocase
$s5 = "win32/neksminer" ascii wide nocase
$s6 = "coinminer:win32/neksminer.a" ascii wide nocase
condition:
uint16(0) == 0x5a4d and any of them
}Tier 2 Behavioral Context Rule (Process Chains & Sigma)
Tracks parent-child process anomalies and suspicious scripting telemetry. Resilient against file renames.
title: SystemHelpDesk Detection - Neksminer (Cryptominer) Execution & Triage
id: d9d4e138-2eac-57cb-b9cb-f614df7ec13d
status: production
description: Detects execution, defense evasion, and persistence behaviors associated
with the Neksminer 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/neksminer
- 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.cryptominer
- author.ricky-jordan
- source.systemhelpdesk-mfc
- attack.t1496
- attack.t1055
- attack.t1562_001
- attack.t1082
- attack.t1547_001
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: mediumTier 3 Attribution Fingerprint Rule (High Fidelity)
Deep signature matching distinctive operational fingerprints and payload characteristics.
rule MALWARE_WIN_NEKSMINER_T3_ATTRIBUTION {
meta:
description = "Tier 3 Attribution Fingerprint: Heuristic detection for Neksminer 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 = "neksminer" 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
}References & External Analysis
- Microsoft Defender Threat Encyclopedia - CoinMiner:Win32/NeksMiner
- Trend Micro Threat Encyclopedia - Coinminer.Win32.NeksMiner
- Search "neksminer" on VirusTotal (External Analysis)
- Search "neksminer" on Any.Run (Sandbox Sandbox)
- Search "neksminer" on MalwareBazaar (Malware Samples)
Frequently Asked Questions
What is CoinMiner:Win32/NeksMiner?
NeksMiner is a stealthy cryptocurrency mining trojan that hijacks computer CPU and GPU power to mine Monero (XMR).
How does NeksMiner hide from users and Task Manager?
It monitors running processes and automatically pauses its mining threads whenever Task Manager or monitoring tools are opened.
How does NeksMiner get installed onto systems?
It is bundled inside cracked video game installers, software keygens, and torrent downloads from untrusted sources.
What hardware damage or performance issues does NeksMiner cause?
It causes high CPU/GPU temperature, constant thermal throttling, loud cooling fans, and severe system lag.
How can you detect and remove NeksMiner?
Run a full scan with Microsoft Defender, check for unauthorized mining services in services.msc, and block mining pool traffic.
How do I remove the Neksminer Cryptominer from Windows?
Manual removal of Neksminer is highly discouraged as it may leave persistence mechanisms intact. We recommend disconnecting the device from the internet and utilizing a professional incident response service or enterprise-grade EDR software to conduct a full forensic sweep.
Is Neksminer a virus or a Cryptominer?
Neksminer is classified as a Cryptominer. Unlike traditional viruses that infect files, modern malware like Neksminer typically operates as a standalone payload designed to compromise systems, steal data, or deploy secondary stage implants.
What are the main symptoms of a Neksminer infection?
Symptoms of Neksminer can include unexpected system slowness, unauthorized outbound network traffic to unknown IP addresses, disabled security software, and suspicious background processes running from AppData or Temp directories.
Protect Your Network Against Cryptominers
Want to prevent Neksminer and similar threats from compromising your organization? Read our comprehensive defensive guide: Cryptojacking & Cryptominer Protection.
📣 Threat Intel Correction or Update?
Notice an outdated IOC, unlisted alias, or disputed attribution? Threat researchers are invited to propose an update on GitHub or contact the SystemHelpDesk research desk. All community revisions are credited in our public CHANGELOG.
Machine-readable
Get this profile as JSON: https://malware-families-catalog.systemhelpdesk.com/api/neksminer.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.
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