Microfake
Table of Contents
Overview
MicroFake (classified across antimalware engines under designations including Rogue:Win32/MicroFake and Trojan:Win32/MicroFake) is a rogue antivirus and scareware family designed to extort money from Windows users through deceptive security warnings mimicking genuine Microsoft Windows Defender alerts. Propagated through fake tech support pages, blackhat SEO redirects, and malicious advertising pop-ups, MicroFake displays simulated system crash screens (Blue Screen of Death / BSOD) and alarm banners claiming the victim's PC is compromised by spyware and banking trojans. It disables Task Manager and locks desktop interaction, directing the victim to call a fraudulent toll-free phone number or purchase an expensive bogus activation license.
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 |
|---|---|---|---|
T1189 | Drive-by Compromise | Initial Access | ATT&CK ↗ |
T1491 | Defacement (UI Manipulation via Fake Alerts) | Impact | ATT&CK ↗ |
T1562.001 | Impair Defenses: Disable or Modify Tools (Blocking real AV) | Defense Evasion | ATT&CK ↗ |
T1547.001 | Boot or Logon Autostart Execution: Registry Run Keys / Startup Folder | Persistence | ATT&CK ↗ |
T1053.005 | Scheduled Task/Job: Scheduled Task | Persistence | 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-STM | Scheduled Task Creation Analysis | Detect | T1053.005 | Audit task creation targeting system and hidden service directories; verify task author credentials. |
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-WIM | Web Interface Monitoring | Detect | T1491 | Deploy automated file integrity monitoring (FIM) and continuous HTTP checksum verification across public web roots. |
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. |
D3-STA | Security Tool Anti-Tamper Enforcement | Harden | T1562.001 | Block unauthorized modification of antivirus registry flags and prevent stopping security agent services. |
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_MICROFAKE_T1_ARTIFACT {
meta:
description = "Tier 1 Primitive Artifact: Raw string matches for Microfake"
tier = "T1 - Primitive Artifact"
confidence = "Low-Medium (Fast Triage)"
author = "SystemHelpdesk Threat Research Desk"
date = "2026-10-14"
strings:
$s1 = "microfake" ascii wide nocase
$s2 = "rogue:win32/microfake" ascii wide nocase
$s3 = "trojan:win32/microfake" ascii wide nocase
$s4 = "scareware:win32/microfake" ascii wide nocase
$s5 = "microfake scareware" ascii wide nocase
$s6 = "win32/microfake" 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 - Microfake (Scareware) Execution & Triage
id: 4a175112-5900-590d-84f7-98914429471f
status: production
description: Detects execution, defense evasion, and persistence behaviors associated
with the Microfake 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/microfake
- https://malware-families-catalog.systemhelpdesk.com/defensive/ransomware-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.scareware
- author.ricky-jordan
- source.systemhelpdesk-mfc
- attack.t1491
- attack.t1562_001
- attack.t1547_001
- attack.t1112
- attack.t1082
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_MICROFAKE_T3_ATTRIBUTION {
meta:
description = "Tier 3 Attribution Fingerprint: Heuristic detection for Microfake 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 = "microfake" 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.
- Boot the infected system into 'Safe Mode with Networking'; this often bypasses the scareware's autostart mechanisms and allows legitimate tools to run.
- Advise the end-user NOT to pay the requested fee; the reported malware infections are fabricated to induce panic.
- Deploy a reputable enterprise anti-malware or adware removal tool (e.g., Malwarebytes, AdwCleaner) to locate and delete the hidden registry keys and scheduled tasks.
- Check for and remove any proxy settings the scareware may have configured in the browser to hijack web traffic.
What to Avoid
Common mistakes during response to this family that can destroy evidence, spread the infection, or worsen recovery.
- Do not input any credit card or personal information into the software's payment portal.
- Avoid ignoring the incident; if the user fell for the lure to install this, they may have unknowingly installed more severe malware (like a banking trojan) from the same source.
References & External Analysis
- Microsoft Defender Threat Encyclopedia - Rogue:Win32/MicroFake
- Malwarebytes Labs - Tech Support Scams and Rogue Software
- MITRE ATT&CK - Defacement: Displaying Fake Security Alerts (T1491)
- Search "microfake" on VirusTotal (External Analysis)
- Search "microfake" on Any.Run (Sandbox Sandbox)
- Search "microfake" on MalwareBazaar (Malware Samples)
Frequently Asked Questions
What is Rogue:Win32/MicroFake?
MicroFake is a scareware and tech support fraud trojan that displays fake Windows virus warnings to extort money from victims.
How does MicroFake mimic legitimate Windows alerts?
It displays authentic-looking dialogs, icons, and fake Blue Screen of Death (BSOD) screens copying Microsoft Windows interfaces.
How does MicroFake lock the user desktop?
It hooks keyboard combinations, disables Task Manager via registry policies, and renders an always-on-top borderless window.
How do victims get infected with MicroFake?
Via malicious website redirects, aggressive pop-up ads, and deceptive software download links.
How do you recover an infected system?
Boot Windows into Safe Mode, terminate the rogue process, delete its persistence registry keys, and run an updated antivirus scan.
How do I remove the Microfake Scareware from Windows?
Manual removal of Microfake 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 Microfake a virus or a Scareware?
Microfake is classified as a Scareware. Unlike traditional viruses that infect files, modern malware like Microfake typically operates as a standalone payload designed to compromise systems, steal data, or deploy secondary stage implants.
What are the main symptoms of a Microfake infection?
Symptoms of Microfake 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 Scarewares
Want to prevent Microfake 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
Get this profile as JSON: https://malware-families-catalog.systemhelpdesk.com/api/microfake.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.