Malxmr
Table of Contents
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
Observed techniques used by this family, mapped to our technical analysis hubs and the official MITRE ATT&CK framework:
| Technique | Name | Tactic | Official Spec |
|---|---|---|---|
T1496 | Resource Hijacking (The core function of mining Monero cryptocurrency) | Impact | ATT&CK ↗ |
T1055 | Process Injection | Defense Evasion | ATT&CK ↗ |
T1059 | Command and Scripting Interpreter | Execution | ATT&CK ↗ |
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.
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-SEA | Script Execution Analysis | Detect | T1059 | Analyze script block syntax and command arguments at runtime to detect malicious automation. |
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. |
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_MALXMR_T1_ARTIFACT {
meta:
description = "Tier 1 Primitive Artifact: Raw string matches for Malxmr"
tier = "T1 - Primitive Artifact"
confidence = "Low-Medium (Fast Triage)"
author = "SystemHelpdesk Threat Research Desk"
date = "2026-10-14"
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
}Tier 2 Behavioral Context Rule (Process Chains & Sigma)
Tracks parent-child process anomalies and suspicious scripting telemetry. Resilient against file renames.
title: SystemHelpDesk Detection - Malxmr (Advanced Threat) Execution & Triage
id: 564e9474-d54b-5d00-b63e-972c29d27b3f
status: production
description: Detects execution, defense evasion, and persistence behaviors associated
with the Malxmr malware family. Detects proxy execution, reflective DLL loading,
and remote command injection associated with modular enterprise backdoors.
references:
- https://malware-families-catalog.systemhelpdesk.com/families/malxmr
- https://malware-families-catalog.systemhelpdesk.com/defensive/backdoor-rat-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.advanced-threat
- author.ricky-jordan
- source.systemhelpdesk-mfc
- attack.t1496
- attack.t1055
- attack.t1059
logsource:
category: process_creation
product: windows
detection:
selection_process:
Image|endswith:
- \powershell.exe
- \cmd.exe
- \rundll32.exe
- \regsvr32.exe
CommandLine|contains:
- DownloadString
- IEX(
- '/s /n /u /i:'
- sc create
- start-process
condition: selection_process
falsepositives:
- Legitimate enterprise administrative scripts during approved change windows
- Authorized IT software deployment utilities and backup management agents
level: highTier 3 Attribution Fingerprint Rule (High Fidelity)
Deep signature matching distinctive operational fingerprints and payload characteristics.
rule MALWARE_WIN_MALXMR_T3_ATTRIBUTION {
meta:
description = "Tier 3 Attribution Fingerprint: Heuristic detection for Malxmr 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 = "malxmr" 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.
- Enforce forensic network isolation on all suspected endpoints while maintaining an out-of-band telemetry conduit to capture live Malxmr adversary activity.
- Perform full memory dumps across identified staging nodes to extract memory-only implants, kernel rootkit hooks, and decrypted Malxmr C2 infrastructure IP/domain lists.
- Review Active Directory domain controller authentication logs for anomalous Kerberos ticket requests (Pass-the-Ticket, Golden Ticket) and unauthorized DCSync operations associated with Malxmr.
- Block all confirmed C2 domains, dynamic DNS endpoints, and proxy IP addresses across perimeter firewalls, proxies, and DNS security gateways.
- Conduct an enterprise-wide sweep across surrounding subnets for secondary webshells, WMI event subscriptions, or remote execution tooling left behind by Malxmr operators.
What to Avoid
Common mistakes during response to this family that can destroy evidence, spread the infection, or worsen recovery.
- Do not assume the incident is resolved simply because an antivirus tool removed the initial Malxmr dropper; always verify that secondary payloads and persistence hooks have been eradicated.
- Avoid logging in with Domain Admin or privileged credentials on a machine suspected of running Malxmr until memory triage is complete.
- Do not delay host isolation; automated lateral movement and credential dumping can occur within minutes of initial execution.
References & External Analysis
- Search "malxmr" on VirusTotal (External Analysis)
- Search "malxmr" on Any.Run (Sandbox Sandbox)
- Search "malxmr" on MalwareBazaar (Malware Samples)
Frequently Asked Questions
What is Malxmr and what threat category does it belong to?
Malxmr is classified as a Advanced Threat. Documented across security telemetry, it is engineered to execute unauthorized operations, establish persistent footholds on target endpoints, and facilitate malicious campaigns targeting enterprise and individual environments.
How does Malxmr establish persistence and evade defensive controls?
Malxmr typically establishes persistence through registry run keys, scheduled tasks, or service installations, while evading signature-based antivirus solutions through code obfuscation, memory injection, or anti-analysis sandbox checks.
What are the essential incident response steps for mitigating a Malxmr compromise?
Security teams responding to Malxmr should immediately isolate affected endpoints from the network, perform memory triage to capture volatile forensic artifacts, audit registry and startup persistence mechanisms, revoke exposed user credentials, and restore systems from verified, clean backups.
What lateral movement and credential access tactics does CoinMiner.MalXMR leverage in enterprise intrusions?
CoinMiner.MalXMR frequently utilizes privileged account harvesting techniques such as LSASS memory dumping, Kerberoasting, and token impersonation to escalate privileges. Once administrative credentials are acquired, it pivots across the victim network utilizing living-off-the-land binaries (LOLBins) such as WMI, PowerShell remoting, and PsExec, or abuses remote desktop protocols (RDP) to reach critical internal repositories and domain controllers.
How does CoinMiner.MalXMR maintain covert communications and evade perimeter network monitoring?
CoinMiner.MalXMR often relies on multi-stage command and control (C2) architectures utilizing encrypted protocols over standard web ports (HTTPS/443 or DNS tunneling) to blend in with legitimate enterprise network traffic. Many variants incorporate proxy networks, domain fronting, or cloud services (such as Microsoft Graph API, Google Drive, or Telegram) to masquerade C2 channels, bypassing traditional signature-based egress filtering.
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.
Protect Your Network Against Advanced_Threats
Want to prevent Malxmr and similar threats from compromising your organization? Read our comprehensive defensive guide: Think You've Been Hacked? What To Do First.
📣 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
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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.