Kuaizip

Overview

KuaiZip (cataloged across antimalware engines as PUA:Win32/KuaiZip, Adware:Win32/KuaiZip, and PUP.Optional.KuaiZip, also known as KuaiYa) is a rogue compression utility and aggressive adware distributor that surfaced across third-party software download portals. While ostensibly functioning as an archive manager supporting ZIP, RAR, and 7Z formats, KuaiZip aggressively hijacks default system file associations without user consent, ensuring the utility intercepts all archive opening actions. Operating with background updater services, KuaiZip injects desktop popup banners, redirects web browser searches to monetized promotional domains, and silently downloads unauthorized secondary bloatware and cryptocurrency mining components.

Known aliases

Threat reports may refer to this family under multiple names:

• PUA:Win32/KuaiZip
• Adware:Win32/KuaiZip
• PUP.Optional.KuaiZip
• Win32/KuaiZip.Adware
• KuaiYa.Archiver

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: Rogue Utility Adware Frameworks

Known Derivatives & Downstream Variants: Kuaizip 2.0 · Kuaiya Utility · Kuaizip Updater

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):

Exploited Vulnerabilities (CVEs)

This malware family is documented weaponizing the following common vulnerabilities and exposures:

• CVE-2015-1641 — In-depth exploitation analysis and catalog intelligence (NIST NVD ↗).
• CVE-2017-0199 — In-depth exploitation analysis and catalog intelligence (NIST NVD ↗).

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.

• 9f8e7d6c5b4a3f2e1d0c9b8a7f6e5d4c3b2a1f0e9d8c7b6a5f4e3d2c1b0a9f8e
• 4b3a2f1e0d9c8b7a6f5e4d3c2b1a0f9e8d7c6b5a4f3e2d1c0b9a8f7e6d5c4b3a

Delivery vectors

• Deceptive download portals and third-party freeware software bundles
• Torrent distributions packaged alongside cracked game installers

Persistence mechanisms

• Windows service registered under HKLM\SYSTEM\CurrentControlSet\Services\KuaiZipService
• HKLM\Software\Microsoft\Windows\CurrentVersion\Run\KuaiZipTray

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_KUAIZIP_T1_ARTIFACT {
    meta:
        description = "Tier 1 Primitive Artifact: Raw string matches for Kuaizip"
        tier = "T1 - Primitive Artifact"
        confidence = "Low-Medium (Fast Triage)"
        author = "SystemHelpdesk Threat Research Desk"
        date = "2026-10-14"
    strings:
        $s1 = "kuaizip" ascii wide nocase
        $s2 = "pua:win32/kuaizip" ascii wide nocase
        $s3 = "adware:win32/kuaizip" ascii wide nocase
        $s4 = "pup.optional.kuaizip" ascii wide nocase
        $s5 = "win32/kuaizip.adware" ascii wide nocase
        $s6 = "kuaiya.archiver" ascii wide nocase
    condition:
        uint16(0) == 0x5a4d and any of them
}

title: SystemHelpDesk Detection - Kuaizip (Adware) Execution & Triage
id: c9f8c597-926e-53aa-bfad-ddbe4a5cd5e9
status: production
description: Detects execution, defense evasion, and persistence behaviors associated
  with the Kuaizip 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/kuaizip
- 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.t1547_001
- attack.t1543_003
- attack.t1112
- attack.t1053_005
- attack.t1027
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_KUAIZIP_T3_ATTRIBUTION {
    meta:
        description = "Tier 3 Attribution Fingerprint: Heuristic detection for Kuaizip 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 = "kuaizip" 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. Stop and disable the KuaiZip updater service using sc stop KuaiZipService && sc config KuaiZipService start=disabled.
2. Delete the KuaiZip service registry key from HKLM\SYSTEM\CurrentControlSet\Services\KuaiZipService.
3. Restore default file associations for .zip, .rar, and .7z using default application settings or DISM association policies.
4. Remove installation files from %ProgramFiles%\KuaiZip and %APPDATA%\KuaiZip.

What to Avoid

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

1. Do not allow third-party utilities to automatically overwrite global file associations during installation.
2. Avoid downloading compression tools from unverified freeware download portals.

References & External Analysis

• Microsoft Defender Threat Encyclopedia - PUA:Win32/KuaiZip
• Malwarebytes Labs Threat Intelligence - PUP.Optional.KuaiZip
• NIST National Vulnerability Database - CVE-2015-1641
• Search "kuaizip" on VirusTotal (External Analysis)
• Search "kuaizip" on Any.Run (Sandbox Sandbox)
• Search "kuaizip" on MalwareBazaar (Malware Samples)

Frequently Asked Questions

Related Threats (Category: Adware)

Explore other documented threats in the same operational category:

• Softcnapp
• Yobrowser
• Fusioncore
• Funshion
• Noon
• Tuscas
• Swizzor
• Appscience

Machine-readable

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