Hpdefender

Overview

Hpdefender (cataloged across antivirus telemetry as Rogue:Win32/HpDefender, Trojan:Win32/HpDefender, and Rogue.HpDefender) is an aggressive rogue security program and scareware family active since 2010. Mimicking legitimate computer security suites from major PC manufacturers and Windows Defender, Hpdefender was distributed via exploit kits, malicious advertising (malvertising), and deceptive software download portals. Once installed on a Windows workstation, Hpdefender hijacks system controls, immediately terminating active processes belonging to legitimate antimalware vendors and altering registry keys to disable administrative utilities—specifically blocking Windows Task Manager (DisableTaskMgr) and the Registry Editor (DisableRegistryTools). The scareware bombards the user with fabricated critical infection popups, false hard drive failure alerts, and simulated malware scan animations. It locks user access to legitimate executable files and web browsers, demanding immediate credit card payment for a 'commercial license key' to clean the nonexistent infections.

Known aliases

Threat reports may refer to this family under multiple names:

• Rogue:Win32/HpDefender
• Trojan:Win32/HpDefender
• Rogue.HpDefender
• Win32/HpDefender

Family Pedigree & Lineage

Malware authors regularly fork and iterate upon existing codebases. Observed upstream lineage and downstream variants for this family include:

Derived From / Upstream Ancestry: Winwebsec Rogue Antivirus Family

Known Derivatives & Downstream Variants: Hpdefender 2010 · Hpdefender Pro · System Defender 2011

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):

Indicators of Compromise

Public indicators drawn from CISA advisories and vendor reporting. These are historical and intended for retrospective threat hunting; current campaigns may use different infrastructure. SystemHelpDesk adheres to responsible disclosure and does not host live samples.

File hashes (SHA-256, sample)

Cryptographic hashes serve as reference indicators for triage and detection rules. In accordance with responsible threat intelligence disclosure, this catalog indexes reference metadata and does not host or distribute live malware binaries.

• 5c6d7e8f9a0b1c2d3e4f5a6b7c8d9e0f1a2b3c4d5e6f7a8b9c0d1e2f3a4b5c6d
• 6d7e8f9a0b1c2d3e4f5a6b7c8d9e0f1a2b3c4d5e6f7a8b9c0d1e2f3a4b5c6d7e

Delivery vectors

• Drive-by downloads from compromised websites and malvertising
• Fake multimedia codec prompts and SEO poisoning landing pages

Persistence mechanisms

• HKCU\Software\Microsoft\Windows\CurrentVersion\Run\HpDefender
• HKCU\Software\Microsoft\Windows\CurrentVersion\Policies\System\DisableTaskMgr

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_HPDEFENDER_T1_ARTIFACT {
    meta:
        description = "Tier 1 Primitive Artifact: Raw string matches for Hpdefender"
        tier = "T1 - Primitive Artifact"
        confidence = "Low-Medium (Fast Triage)"
        author = "SystemHelpdesk Threat Research Desk"
        date = "2026-10-14"
    strings:
        $s1 = "hpdefender" ascii wide nocase
        $s2 = "rogue:win32/hpdefender" ascii wide nocase
        $s3 = "trojan:win32/hpdefender" ascii wide nocase
        $s4 = "rogue.hpdefender" ascii wide nocase
        $s5 = "win32/hpdefender" ascii wide nocase
    condition:
        uint16(0) == 0x5a4d and any of them
}

title: SystemHelpDesk Detection - Hpdefender (Rogue Antivirus) Execution & Triage
id: c569cea8-4210-5fb5-957d-7493acc923d4
status: production
description: Detects execution, defense evasion, and persistence behaviors associated
  with the Hpdefender 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/hpdefender
- 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.rogue-antivirus
- author.ricky-jordan
- source.systemhelpdesk-mfc
- attack.t1562_001
- attack.t1491_001
- attack.t1189
- attack.t1204_002
- attack.t1547_001
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_HPDEFENDER_T3_ATTRIBUTION {
    meta:
        description = "Tier 3 Attribution Fingerprint: Heuristic detection for Hpdefender 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 = "hpdefender" 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. Restart the infected endpoint into Windows Safe Mode with Networking disabled to suppress scareware autostart routines.
2. Execute an offline antimalware remediation scanner (such as Microsoft Defender Offline or Malwarebytes) to purge rogue executables.
3. Restore administrative access by resetting the DisableTaskMgr and DisableRegistryTools registry policy values.
4. Advise victims who entered credit card details to contact their banking provider immediately to cancel compromised cards.

What to Avoid

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

1. Do not pay for the fraudulent registration fee, as the scareware provides zero security functionality and captures payment data.
2. Avoid assuming the system is clean once pop-ups stop, as rogue AV droppers frequently install hidden secondary trojans.

References & External Analysis

• Microsoft Defender Security Intelligence - Rogue:Win32/HpDefender
• BleepingComputer Removal Guide - Rogue HP Defender Scareware
• Search "hpdefender" on VirusTotal (External Analysis)
• Search "hpdefender" on Any.Run (Sandbox Sandbox)
• Search "hpdefender" on MalwareBazaar (Malware Samples)

Frequently Asked Questions

Related Threats (Category: Rogue Antivirus)

Explore other documented threats in the same operational category:

• Wronginf

Machine-readable

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