Minerbat
Table of Contents
Overview
Trojan:BAT/Minerbat (or simply Miner.bat) is a classification for extremely simple, script-based cryptojacking malware. Instead of complex compiled executables, Minerbat utilizes basic Windows Batch scripting (`.bat` or `.cmd` files) (`T1059.003`) to download, configure, and execute a command-line cryptocurrency miner (like XMRig or CGMiner) on the victim's machine, stealing their CPU/GPU resources to mine Monero (XMR) or other altcoins (`T1496`).
Understanding Minerbat (Script-based Cryptojacking)
To an end-user, the computer will suddenly become sluggish, the fans will spin up to maximum speed, and battery life will plummet. For a SOC analyst, Minerbat represents a 'low effort, high reward' attack. The attackers rely on the simplicity of batch scripts to evade complex EDR heuristics, capitalizing on environments that fail to monitor basic command-line execution.
Execution and Mining Mechanics
Minerbat is often delivered via phishing links, dropped by other malware, or executed via exploited vulnerable services (like an exposed Redis or Tomcat server). Upon execution, the batch script (`T1059.003`) typically uses built-in tools like `bitsadmin`, `certutil`, or PowerShell (`T1105`) to download the actual mining binary (e.g., `xmrig.exe`) and a configuration file containing the attacker's wallet address. It then executes the miner silently in the background, often passing arguments to limit CPU usage to 80% to avoid immediately crashing the system and arousing suspicion. Persistence is usually achieved by adding the batch script to the Startup folder or creating a simple Scheduled Task (`T1053.005`).
Indicators of Compromise & Impact
The impact is hardware wear and tear, significantly increased power consumption, and degraded system performance. Host-based IoCs include EDR alerts for suspicious command-line execution (e.g., `cmd.exe /c start /B xmrig.exe -o pool.hashvault.pro...`), high CPU utilization by unknown or generic executables, and the presence of malicious `.bat` files in user directories or Startup folders. Network IoCs involve continuous outbound traffic (often utilizing the Stratum protocol) over non-standard ports (e.g., 3333, 5555, 14444) to known cryptocurrency mining pools.
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:
- T1059.003: Restrict execution of Windows Command Shell (cmd.exe) and block unauthorized batch scripts.
- 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):
| D3FEND ID | Countermeasure Name | Tactic | Countered ATT&CK | Defensive Guidance |
|---|---|---|---|---|
D3-PBA | Process Spawn Analysis | Detect | T1059.003 | Inspect command-line arguments and anomalous parent-child relationships spawning from cmd.exe. |
D3-NTI | Network Traffic Inspection | Detect | T1105 | Inspect deep packet payloads for anomalous staging binaries and unauthorized egress protocols. |
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_MINERBAT_T1_ARTIFACT {
meta:
description = "Tier 1 Primitive Artifact: Raw string matches for Minerbat"
tier = "T1 - Primitive Artifact"
confidence = "Low-Medium (Fast Triage)"
author = "SystemHelpdesk Threat Research Desk"
date = "2026-10-14"
strings:
$s1 = "minerbat" 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 - Minerbat (Trojan) Execution & Triage
id: b14ac4d5-c32b-5549-ad1f-6271f1b8e98f
status: production
description: Detects execution, defense evasion, and persistence behaviors associated
with the Minerbat 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/minerbat
- https://malware-families-catalog.systemhelpdesk.com/defensive/downloader-dropper-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.trojan
- author.ricky-jordan
- source.systemhelpdesk-mfc
- attack.t1105
- attack.t1059_003
- attack.t1496
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_MINERBAT_T3_ATTRIBUTION {
meta:
description = "Tier 3 Attribution Fingerprint: Heuristic detection for Minerbat 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 = "minerbat" 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.
- Identify the process consuming the high CPU (often the mining executable launched by the script) and terminate it.
- Locate and delete the malicious batch script and the downloaded mining binary.
- Remove any Scheduled Tasks or Startup folder shortcuts created by the script to ensure it does not return on reboot.
- Block access to known cryptocurrency mining pools at the corporate firewall/proxy level.
What to Avoid
Common mistakes during response to this family that can destroy evidence, spread the infection, or worsen recovery.
- Do not ignore instances of `bitsadmin` or `certutil` downloading files, as this is a primary technique used by these scripts to fetch the miner.
- Avoid allowing unsigned scripts to execute freely from user profile directories.
References & External Analysis
- Search "minerbat" on VirusTotal (External Analysis)
- Search "minerbat" on Any.Run (Sandbox Sandbox)
- Search "minerbat" on MalwareBazaar (Malware Samples)
Frequently Asked Questions
What is Minerbat and what threat category does it belong to?
Minerbat is classified as a Trojan. 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 Minerbat establish persistence and evade defensive controls?
Minerbat 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 Minerbat compromise?
Security teams responding to Minerbat 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 secondary payloads and staging behaviors are commonly associated with Minerbat?
Minerbat frequently operates as a loader or dropper designed to establish a foothold before downloading and executing secondary high-impact malware payloads. Depending on the threat actor's objectives, these dropped modules can range from ransomware and banking injects to modular infostealers and remote management backdoors.
How can security operations teams effectively detect and hunt for Minerbat across enterprise endpoints?
Defenders should hunt for Minerbat by deploying behavioral endpoint detection and response (EDR) rules that monitor suspicious process spawning (such as cmd.exe or powershell.exe spawned from office documents or temporary directories), anomalous outbound network connections from non-browser binaries, and unauthorized modifications to Windows Run keys and scheduled task registries.
How do I remove the Minerbat Trojan from Windows?
Manual removal of Minerbat 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 Minerbat a virus or a Trojan?
Minerbat is classified as a Trojan. Unlike traditional viruses that infect files, modern malware like Minerbat typically operates as a standalone payload designed to compromise systems, steal data, or deploy secondary stage implants.
What are the main symptoms of a Minerbat infection?
Symptoms of Minerbat 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 Trojans
Want to prevent Minerbat and similar threats from compromising your organization? Read our comprehensive defensive guide: Banking Trojan Protection for Businesses.
📣 Threat Intel Correction or Update?
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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.