Pccleaner

Overview

PCCleaner (classified in antimalware engines under designations including PUA:Win32/PCCleaner, Program:Win32/PCCleaner, and Rogue:Win32/PCCleaner) is a Potentially Unwanted Application and rogue system optimization utility that misleads Windows users regarding their computer's stability and operational health. Distributed through misleading pay-per-install bundles, deceptive software update portals, and aggressive popup advertisements, PCCleaner automatically initiates simulated system scans upon installation. The software intentionally reports hundreds or thousands of fabricated 'critical errors', harmless registry keys, and ordinary browser cookie caches as urgent security hazards and system crashes. PCCleaner locks down its remediation features, presenting persistent pop-ups and full-screen warning banners demanding that the victim purchase a paid premium license key to 'fix' the non-existent problems. Additionally, PCCleaner establishes persistent autostart entries under HKCU\Software\Microsoft\Windows\CurrentVersion\Run, installs telemetry background tasks, and continually consumes system CPU and RAM.

Known aliases

Threat reports may refer to this family under multiple names:

• PUA:Win32/PCCleaner
• Program:Win32/PCCleaner
• Rogue:Win32/PCCleaner
• Win32/PCCleaner
• PC Cleaner Pro Rogue

MITRE ATT&CK Techniques

Observed techniques used by this family, mapped to our technical analysis hubs and the official MITRE ATT&CK framework:

MITRE D3FEND™ Defensive Countermeasures

Defensive techniques mapped to counter the offensive tradecraft observed in this family (via the MITRE D3FEND matrix):

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:

rule MALWARE_WIN_PCCLEANER_T1_ARTIFACT {
    meta:
        description = "Tier 1 Primitive Artifact: Raw string matches for Pccleaner"
        tier = "T1 - Primitive Artifact"
        confidence = "Low-Medium (Fast Triage)"
        author = "SystemHelpdesk Threat Research Desk"
        date = "2026-10-14"
    strings:
        $s1 = "pccleaner" ascii wide nocase
        $s2 = "pua:win32/pccleaner" ascii wide nocase
        $s3 = "program:win32/pccleaner" ascii wide nocase
        $s4 = "rogue:win32/pccleaner" ascii wide nocase
        $s5 = "win32/pccleaner" ascii wide nocase
        $s6 = "pc cleaner pro rogue" ascii wide nocase
    condition:
        uint16(0) == 0x5a4d and any of them
}

title: SystemHelpDesk Detection - Pccleaner (Pua) Execution & Triage
id: d0a089b7-5dd7-5395-8548-952f8c054195
status: production
description: Detects execution, defense evasion, and persistence behaviors associated
  with the Pccleaner 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/pccleaner
- 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.pua
- author.ricky-jordan
- source.systemhelpdesk-mfc
- attack.t1491
- attack.t1547_001
- attack.t1053_005
- 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: medium

rule MALWARE_WIN_PCCLEANER_T3_ATTRIBUTION {
    meta:
        description = "Tier 3 Attribution Fingerprint: Heuristic detection for Pccleaner 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 = "pccleaner" 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.

1. Advise the end-user NOT to pay the requested fee; the reported system errors are fabricated to induce panic.
2. Use the Windows Control Panel to uninstall the rogue application, but do not assume this fully cleans the system.
3. 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 left behind by the uninstaller.
4. Review browser configurations to ensure no rogue extensions or homepage hijackers were installed alongside the scareware.

What to Avoid

Common mistakes during response to this family that can destroy evidence, spread the infection, or worsen recovery.

1. Do not input any credit card or personal information into the software's payment portal.
2. Avoid ignoring the incident; if the user installed this, they may have unknowingly installed more severe malware from the same bundled package.

References & External Analysis

• Microsoft Defender Security Intelligence - PUA:Win32/PCCleaner
• Malwarebytes Labs - PUP.Optional.PCCleaner Removal Guide
• MITRE ATT&CK - Defacement: Displaying Fake Security Alerts (T1491)
• Search "pccleaner" on VirusTotal (External Analysis)
• Search "pccleaner" on Any.Run (Sandbox Sandbox)
• Search "pccleaner" on MalwareBazaar (Malware Samples)

Frequently Asked Questions

Related Threats (Category: Pua)

Explore other documented threats in the same operational category:

• Cloudwrapper
• Iobit
• Appset
• Driverpack
• Outbrowse
• Vittalia
• Gt32Supportgeeks
• Systweak

Machine-readable

Get this profile as JSON: https://malware-families-catalog.systemhelpdesk.com/api/pccleaner.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.