Cryptominer
Overview
Executive Summary
"Cryptominer" (often flagged as Riskware.CoinMiner, Trojan.Miner, or PUA.Miner) is a generic detection classification for software that utilizes the infected host's computing resources (CPU or GPU) to solve complex cryptographic equations, thereby "mining" cryptocurrency (most commonly Monero) for the benefit of the attacker. This process is known as "Cryptojacking."Technical Architecture and Capabilities
Cryptominers can be distributed as standalone executables (Trojans), bundled within Potentially Unwanted Programs (PUPs), or even executed entirely within a web browser via malicious JavaScript (Web-based Cryptojacking). Key behavioral characteristics include:- Resource Exhaustion: The primary signature of a cryptominer is the immediate, sustained maximization of CPU or GPU usage. The malware is designed to push the hardware to its thermal limits to generate cryptocurrency as rapidly as possible.
- Pool Communication: Miners do not operate in isolation; they connect to "Mining Pools" using the Stratum protocol (often over standard HTTP/HTTPS ports or custom TCP ports) to receive work algorithms and submit computed hashes.
- Defense Evasion: Advanced miners (like those deployed by the LemonDuck botnet) contain routines to monitor for the execution of Task Manager or Resource Monitor. If the user attempts to check system performance, the miner will temporarily pause its operations to hide the CPU spike.
Threat Impact
While cryptominers typically do not steal data or encrypt files, they cause severe operational degradation. The extreme load on the hardware leads to system freezing, application crashes, increased power consumption, and significantly reduced hardware lifespans due to thermal stress. Furthermore, a miner on a corporate network indicates a fundamental breach of endpoint security.Incident Response and Advanced Analysis
- Performance Monitoring: Utilize enterprise monitoring tools to identify endpoints exhibiting sustained, unexplained 100% CPU/GPU utilization during normal business hours.
- Network Blocking: Identify and block network connections to known mining pool domains (e.g., `minexmr.com`, `nanopool.org`) at the corporate firewall to immediately render the miners useless.
- Eradication: Isolate the endpoint and perform a deep system scan to remove the miner executable, its associated persistence mechanisms (Registry `Run` keys, WMI subscriptions), and any secondary backdoors dropped by the initial infection vector.
Known aliases
Threat reports may refer to this family under multiple names:
MITRE ATT&CK Techniques
This family has been observed using the following ATT&CK techniques: T1496 T1059 T1562.001
Tactical Mitigations
Based on the techniques used by this family, consider the following defensive strategies:
- T1059: Restrict execution of scripting languages such as PowerShell, VBScript, or Python to authorized administrators. Enforce Script Block Logging.
Generated Detections (Boilerplate)
These YARA and Sigma rules are auto-generated based on the family name and aliases. They must be heavily tuned before deployment in a production environment.
YARA Rule
rule MALWARE_WIN_CRYPTOMINER {
meta:
description = "Detects Cryptominer (trojan)"
author = "SystemHelpdesk Boilerplate Generator"
date = "2026-07-06"
strings:
$s1 = "cryptominer" ascii wide nocase
$s2 = "riskware.coinminer" ascii wide nocase
$s3 = "trojan.miner" ascii wide nocase
$s4 = "pua.miner" ascii wide nocase
condition:
uint16(0) == 0x5a4d and any of them
}Sigma Rule
title: Suspicious Cryptominer Activity
id: 390f9fa3d1d220eafdb4cbf7ca4baffc
status: experimental
description: Detects generic indicators of the cryptominer malware family.
logsource:
category: process_creation
product: windows
detection:
selection:
Image|endswith:
- '\cmd.exe'
- '\powershell.exe'
CommandLine|contains:
- "*cryptominer*"
- "*riskware.coinminer*"
- "*trojan.miner*"
- "*pua.miner*"
condition: selection
level: mediumReferences & External Analysis
- Search "cryptominer" on VirusTotal (External Analysis)
Frequently Asked Questions
How do I remove the Cryptominer Trojan from Windows?
Manual removal of Cryptominer 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 Cryptominer a virus or a Trojan?
Cryptominer is classified as a Trojan. Unlike traditional viruses that infect files, modern malware like Cryptominer typically operates as a standalone payload designed to compromise systems, steal data, or deploy secondary stage implants.
What are the main symptoms of a Cryptominer infection?
Symptoms of Cryptominer 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.
Related Families (Category: trojan)
Explore other malware families in the same category:
Protect Your Network Against Trojans
Want to prevent Cryptominer and similar threats from compromising your organization? Read our comprehensive defensive guide: Banking Trojan Protection.
Machine-readable
Get this profile as JSON: https://jordan123234-malware-families-explorer.static.hf.space/api/cryptominer.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.