Openshopper
Table of Contents
Overview
Adware:Win32/Openshopper is a highly persistent adware framework and browser hijacker designed to inject unsolicited advertisements, fake coupons, and sponsored links directly into the user's web browsing experience (`T1189`). While marketed as a 'shopping assistant' or browser extension, its primary function is to intercept web traffic and monetize the user's behavior without their informed consent.
Understanding Openshopper
To an end-user, Openshopper manifests as a significant degradation of the web experience. Every e-commerce site visited will be overlaid with 'Compare Prices!' boxes, text links will be hyperlinked to third-party domains, and the default search engine is invariably changed. For a security team, it represents a risk to data privacy and a potential vector for more severe malvertising attacks, as the infrastructure serving the ads is often poorly secured.
Execution and Hijacking Mechanics
Openshopper is almost exclusively distributed via Software Bundling (`T1189`)—attached to free software downloads, fake Flash updates, or pirated media. Upon execution, it installs itself as a Windows Service or Scheduled Task to ensure persistence (`T1543.003`). It then forcibly installs extensions into Chrome, Firefox, and Edge. To protect these extensions from being easily uninstalled by the user, Openshopper often modifies the Windows Registry (e.g., setting 'ForceInstall' Chrome policies) (`T1562.001`), locking the extension into the browser.
Indicators of Compromise & Impact
The primary impact is the unauthorized monetization of user data and exposure to malicious advertising. Host-based IoCs include registry modifications in `HKLM\Software\Policies\Google\Chrome\ExtensionInstallForcelist`, the presence of unexpected scheduled tasks updating browser extensions, and unusual executables running from `%ProgramFiles%` or `%LocalAppData%` mimicking legitimate software names. Network IoCs include a massive volume of background HTTP/HTTPS requests to advertising and tracking domains whenever a browser is open.
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):
| 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-SCM | Windows Service Creation Monitoring | Detect | T1543.003 | Verify service binary image signatures and restrict standard users from creating or modifying service definitions. |
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_OPENSHOPPER_T1_ARTIFACT {
meta:
description = "Tier 1 Primitive Artifact: Raw string matches for Openshopper"
tier = "T1 - Primitive Artifact"
confidence = "Low-Medium (Fast Triage)"
author = "SystemHelpdesk Threat Research Desk"
date = "2026-10-14"
strings:
$s1 = "openshopper" 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 - Openshopper (Advanced Threat) Execution & Triage
id: ee78cf7a-d8ed-54f8-8deb-c53fb5f3de37
status: production
description: Detects execution, defense evasion, and persistence behaviors associated
with the Openshopper 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/openshopper
- 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.t1189
- attack.t1562_001
- attack.t1543_003
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_OPENSHOPPER_T3_ATTRIBUTION {
meta:
description = "Tier 3 Attribution Fingerprint: Heuristic detection for Openshopper 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 = "openshopper" 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 an enterprise-grade Adware/Malware removal tool to identify and strip out the persistent registry keys and services protecting the adware.
- Manually inspect and remove any forced browser policies (`chrome://policy` or `edge://policy`) that prevent extension removal.
- Reset all installed web browsers to their default, factory settings to clear out hijacked search engines and proxy configurations.
- Implement endpoint application control to block the execution of common, known adware installers from user directories.
What to Avoid
Common mistakes during response to this family that can destroy evidence, spread the infection, or worsen recovery.
- Do not rely solely on the browser's 'Uninstall Extension' button; Openshopper's background service will simply reinstall it.
- Avoid downloading 'free' software from third-party download portals, as they are the primary distribution vector for bundled adware.
References & External Analysis
- Search "openshopper" on VirusTotal (External Analysis)
- Search "openshopper" on Any.Run (Sandbox Sandbox)
- Search "openshopper" on MalwareBazaar (Malware Samples)
Frequently Asked Questions
What is Openshopper and what threat category does it belong to?
Openshopper 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 Openshopper establish persistence and evade defensive controls?
Openshopper 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 Openshopper compromise?
Security teams responding to Openshopper 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 Openshopper leverage in enterprise intrusions?
Openshopper 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 Openshopper maintain covert communications and evade perimeter network monitoring?
Openshopper 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 the Openshopper Advanced_Threat from Windows?
Manual removal of Openshopper 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 Openshopper a virus or a Advanced_Threat?
Openshopper is classified as a Advanced_Threat. Unlike traditional viruses that infect files, modern malware like Openshopper typically operates as a standalone payload designed to compromise systems, steal data, or deploy secondary stage implants.
What are the main symptoms of a Openshopper infection?
Symptoms of Openshopper 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 Openshopper 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/openshopper.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.