Epicscale
Table of Contents
Overview
Adware:Win32/Epicscale is a Potentially Unwanted Program (PUP) that operates as a covert cryptocurrency miner. While it originally presented itself as a platform that used 'idle processing power' for charitable causes, it is widely classified as adware/riskware due to its deceptive installation practices (often bundled with other software without clear consent) and the severe impact it has on system performance.
Understanding Epicscale (Cryptojacking)
To an end-user, an Epicscale infection manifests as severe system sluggishness. Fans may run at maximum speed, laptops will overheat, and battery life will plummet, even when the computer is ostensibly idle. For a security administrator, Epicscale is a form of Resource Hijacking (`T1496`). It steals the organization's hardware resources and electricity to mine cryptocurrency (like Bitcoin or Monero) for the software developers.
Execution and Hijacking Mechanics
Epicscale is typically distributed via software bundles (`T1189`). When a user downloads a free utility (like uTorrent, which notoriously bundled Epicscale in 2015), Epicscale installs silently in the background. It establishes persistence via the Registry Run keys or Scheduled Tasks (`T1547.001`) to ensure it launches automatically. Once running, it utilizes the CPU and sometimes the GPU to perform complex cryptographic hashing, communicating with external mining pools (`T1105`) to submit completed 'shares' and receive new workloads.
Indicators of Compromise & Impact
The primary impact is severe performance degradation and potential hardware damage due to overheating. Host-based IoCs include prolonged, 100% CPU utilization by unknown or unexpected processes (often disguised with generic names). The presence of the Epicscale application in `C:\Program Files` or `%AppData%` is a definitive indicator. Network IoCs include constant, low-bandwidth outbound traffic (often TCP over non-standard ports like 3333 or 14444) communicating with known cryptocurrency mining pools (e.g., Stratum protocol).
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 (Cryptocurrency Mining) | Impact | ATT&CK ↗ |
T1547.001 | Boot or Logon Autostart Execution | Persistence | ATT&CK ↗ |
T1189 | Drive-by Compromise (Software Bundling) | Initial Access | ATT&CK ↗ |
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-RBI | Remote Browser Isolation | Isolate | T1189 | Execute untrusted web browsing sessions in disposable cloud containers to isolate drive-by exploits from local endpoints. |
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. |
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_EPICSCALE_T1_ARTIFACT {
meta:
description = "Tier 1 Primitive Artifact: Raw string matches for Epicscale"
tier = "T1 - Primitive Artifact"
confidence = "Low-Medium (Fast Triage)"
author = "SystemHelpdesk Threat Research Desk"
date = "2026-10-14"
strings:
$s1 = "epicscale" 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 - Epicscale (Advanced Threat) Execution & Triage
id: 70e84d6e-fdd8-5dd8-a24c-38d1bf672f96
status: production
description: Detects execution, defense evasion, and persistence behaviors associated
with the Epicscale 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/epicscale
- 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.t1547_001
- attack.t1189
- attack.t1496
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_EPICSCALE_T3_ATTRIBUTION {
meta:
description = "Tier 3 Attribution Fingerprint: Heuristic detection for Epicscale 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 = "epicscale" 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.
- Use the Windows Task Manager or EDR tools to identify the process consuming excessive CPU resources and terminate it immediately.
- Use the Windows Control Panel to thoroughly uninstall the 'Epicscale' application and the parent program that bundled it.
- Run a full scan with a reputable antimalware tool to ensure all associated scheduled tasks and hidden mining components are removed.
- Update network firewall rules to block outbound traffic to known cryptocurrency mining pools (Stratum protocol).
What to Avoid
Common mistakes during response to this family that can destroy evidence, spread the infection, or worsen recovery.
- Do not ignore complaints of slow or overheating computers; it is often the first indicator of a cryptojacking infection.
- Avoid allowing users to download unverified freeware or torrent clients, as these are the primary distribution vectors for bundled miners.
References & External Analysis
- Search "epicscale" on VirusTotal (External Analysis)
- Search "epicscale" on Any.Run (Sandbox Sandbox)
- Search "epicscale" on MalwareBazaar (Malware Samples)
Frequently Asked Questions
What is Epicscale and what threat category does it belong to?
Epicscale 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 Epicscale establish persistence and evade defensive controls?
Epicscale 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 Epicscale compromise?
Security teams responding to Epicscale 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 Epicscale leverage in enterprise intrusions?
Epicscale 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 Epicscale maintain covert communications and evade perimeter network monitoring?
Epicscale 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 Epicscale from Windows?
Manual removal of Epicscale 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.
What are the main symptoms of a Epicscale infection?
Symptoms of Epicscale 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 Epicscale 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.