Malxmr
Overview
Executive Summary
MalXMR is a pervasive and highly optimized malicious cryptocurrency miner (cryptojacking malware) specifically engineered to illicitly mine Monero (XMR). By stealthily hijacking the CPU resources of infected endpoints and servers, MalXMR generates cryptocurrency for its operators, resulting in severe performance degradation, hardware wear, and dramatically increased power consumption for the victim organization.Technical Implementation and Execution
MalXMR is frequently deployed as a secondary payload by initial access brokers, dropped by exploit kits targeting unpatched vulnerabilities (such as ProxyLogon or Log4Shell on servers), or distributed via malicious spam campaigns. Upon execution, MalXMR focuses entirely on stealth and maximum CPU utilization:- Process Hollowing and Injection: It routinely injects its highly optimized mining payload (often a modified version of the legitimate open-source XMRig miner) into legitimate Windows processes like `svchost.exe`, `conhost.exe`, or `notepad.exe` to mask its execution from system administrators.
- Resource Evasion: Advanced variants of MalXMR actively monitor user activity. If the user moves the mouse or opens the Windows Task Manager, the miner will immediately suspend its threads to drop CPU usage to normal levels, avoiding detection.
- Stratum Protocol: The malware communicates with remote, anonymized mining pools utilizing the Stratum mining protocol, receiving block calculations and returning valid hashes.
Operational Impact
MalXMR causes significant operational disruption. Infected machines suffer from extreme latency, overheating, and frequent crashes. In enterprise environments, widespread cryptojacking infections dramatically increase cloud computing costs (if AWS/Azure instances are infected) and accelerate on-premise hardware degradation.Detection and Remediation
- Performance Monitoring: Utilize endpoint management tools and cloud monitoring dashboards to alert on sustained, unexplained high CPU usage (often pinned at 90-100%) across multiple endpoints or server instances.
- Network Traffic Analysis: Inspect outbound network traffic for connections utilizing the Stratum protocol (JSON-RPC over TCP) or connections to known cryptocurrency mining pools, often occurring over Port 3333 or Port 80/443 to blend in.
- Endpoint Detection and Response (EDR): Deploy EDR solutions configured to detect process hollowing and the execution of known mining binaries operating under the guise of legitimate system processes.
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 T1055 T1059
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_MALXMR {
meta:
description = "Detects Malxmr (advanced_threat)"
author = "SystemHelpdesk Boilerplate Generator"
date = "2026-07-06"
strings:
$s1 = "malxmr" ascii wide nocase
$s2 = "coinminer.malxmr" ascii wide nocase
$s3 = "trojan.malxmr" ascii wide nocase
$s4 = "riskware.bitcoinminer" ascii wide nocase
condition:
uint16(0) == 0x5a4d and any of them
}Sigma Rule
title: Suspicious Malxmr Activity
id: aa002d270024055443cda7c06a7fb33e
status: experimental
description: Detects generic indicators of the malxmr malware family.
logsource:
category: process_creation
product: windows
detection:
selection:
Image|endswith:
- '\cmd.exe'
- '\powershell.exe'
CommandLine|contains:
- "*malxmr*"
- "*coinminer.malxmr*"
- "*trojan.malxmr*"
- "*riskware.bitcoinminer*"
condition: selection
level: mediumReferences & External Analysis
- Search "malxmr" on VirusTotal (External Analysis)
Frequently Asked Questions
How do I remove the Malxmr Advanced_Threat from Windows?
Manual removal of Malxmr 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 Malxmr a virus or a Advanced_Threat?
Malxmr is classified as a Advanced_Threat. Unlike traditional viruses that infect files, modern malware like Malxmr typically operates as a standalone payload designed to compromise systems, steal data, or deploy secondary stage implants.
What are the main symptoms of a Malxmr infection?
Symptoms of Malxmr 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: advanced_threat)
Explore other malware families in the same category:
Protect Your Network Against Advanced_Threats
Want to prevent Malxmr and similar threats from compromising your organization? Read our comprehensive defensive guide: Suspect an Infection? What to do.
Machine-readable
Get this profile as JSON: https://jordan123234-malware-families-explorer.static.hf.space/api/malxmr.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.