Dealply

Overview

DealPly (classified across security products as Adware:Win32/DealPly, Adware.DealPly, and Win32:DealPly) is a sophisticated modular adware and browser modification platform analyzed by Microsoft Defender, Kaspersky, and Malwarebytes. Deceptively promoted as a shopping comparison and coupon assistant, DealPly infiltrates Windows endpoints through third-party freeware installers and pay-per-install networks. Modern iterations of DealPly feature robust defense evasion capabilities, including hardware fingerprinting, virtual machine detection, and evasion of Microsoft SmartScreen verification. Once running, DealPly installs unauthorized extension objects in Google Chrome, Mozilla Firefox, and Microsoft Edge. It monitors user e-commerce browsing, injects sponsored pricing comparison iframes into merchant web pages, hijacks search engine queries, and sends detailed telemetry back to remote advertising infrastructure over encrypted HTTPS.

Known aliases

Threat reports may refer to this family under multiple names:

• Adware:Win32/DealPly
• Adware.DealPly
• Win32:DealPly
• DealPly Adware
• PUP.Optional.DealPly
• Win32/DealPly.A

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: Dealply_Shopping_Adware_Engine

Known Derivatives & Downstream Variants: Dealply.Gen · Dealply.A · Adware.Dealply

MITRE ATT&CK Techniques

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

Tactical Mitigations

Based on the techniques used by this family, consider the following defensive strategies:

• T1071.001: Implement web filtering and SSL/TLS inspection to detect malicious command and control (C2) traffic hiding in HTTP/HTTPS.

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.

• 5e6f7a8b9c0d1e2f3a4b5c6d7e8f9a0b1c2d3e4f5a6b7c8d9e0f1a2b3c4d5e6f
• 6f7a8b9c0d1e2f3a4b5c6d7e8f9a0b1c2d3e4f5a6b7c8d9e0f1a2b3c4d5e6f7a

Delivery vectors

• Bundled with deceptive utility installers and third-party software downloaders
• Web exploitation kits targeting Internet Explorer VBScript engine (CVE-2018-8174)

Persistence mechanisms

• Browser extension injection across Chrome and Edge profile directories
• HKCU\Software\Microsoft\Windows\CurrentVersion\Run\DealPlyLive

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_DEALPLY_T1_ARTIFACT {
    meta:
        description = "Tier 1 Primitive Artifact: Raw string matches for Dealply"
        tier = "T1 - Primitive Artifact"
        confidence = "Low-Medium (Fast Triage)"
        author = "SystemHelpdesk Threat Research Desk"
        date = "2026-10-14"
    strings:
        $s1 = "dealply" ascii wide nocase
        $s2 = "adware:win32/dealply" ascii wide nocase
        $s3 = "adware.dealply" ascii wide nocase
        $s4 = "win32:dealply" ascii wide nocase
        $s5 = "dealply adware" ascii wide nocase
        $s6 = "pup.optional.dealply" ascii wide nocase
        $s7 = "win32/dealply.a" ascii wide nocase
    condition:
        uint16(0) == 0x5a4d and any of them
}

title: SystemHelpDesk Detection - Dealply (Adware) Execution & Triage
id: fc922bdc-fc56-5f26-b3a9-dbd0e90eb194
status: production
description: Detects execution, defense evasion, and persistence behaviors associated
  with the Dealply 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/dealply
- 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.adware
- author.ricky-jordan
- source.systemhelpdesk-mfc
- attack.t1176
- attack.t1497
- attack.t1112
- attack.t1071_001
- 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_DEALPLY_T3_ATTRIBUTION {
    meta:
        description = "Tier 3 Attribution Fingerprint: Heuristic detection for Dealply 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 = "dealply" 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. Quarantine the Dealply installer package and terminate any active background browser helper processes or pop-up launchers.
2. Audit all web browser extensions, proxy configurations, and shortcut targets (.lnk files) on desktop and taskbar to purge malicious command-line parameters appended by Dealply.
3. Purge unauthorized Scheduled Tasks and Registry Run entries configured by Dealply to re-spawn bundled greyware packages.
4. Perform a comprehensive secondary anti-malware scan to ensure no hidden trojan downloaders or cryptominers were dropped alongside Dealply.

What to Avoid

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

1. Do not dismiss Dealply as harmless nuisance software; greyware distribution networks frequently pivot to delivering high-severity malware payloads.
2. Avoid clicking interactive prompts or fake 'update' dialogs generated by Dealply, which often trigger secondary drive-by downloads.

References & External Analysis

• Microsoft Defender Threat Encyclopedia - Adware:Win32/DealPly
• Kaspersky Threat Intelligence Portal - Adware.DealPly Analysis
• NIST National Vulnerability Database - CVE-2018-8174
• Search "dealply" on VirusTotal (External Analysis)
• Search "dealply" on Any.Run (Sandbox Sandbox)
• Search "dealply" on MalwareBazaar (Malware Samples)

Frequently Asked Questions

Related Threats (Category: Adware)

Explore other documented threats in the same operational category:

• 1Clickdownload
• Autofixerpro
• Addrop
• Downloadassistant
• Tuscas
• Adwaresig
• Webalta
• Installtoolbar

Machine-readable

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