Mikey

Overview

Mikey (cataloged across security software as PUA.Win32.Mikey.AA, Trojan:Win32/Mikey, and PUA:Win32/Mikey!MTB) is a pervasive Potentially Unwanted Application (PUA) and adware downloader operating on Windows platforms since 2015. Typically distributed through commercial software bundlers, pay-per-install (PPI) networks, and pirated media repositories, Mikey masquerades as a software update utility or media codec pack. Upon installation, Mikey establishes background persistence through Windows scheduled tasks and autostart registry entries, creating dedicated folders under %LOCALAPPDATA% to house its binary components. Once active, the application monitors browser sessions, modifies default search engine preferences, injects unwanted banner advertisements into web pages, and communicates with remote affiliate servers to report machine telemetry and download additional monetized adware modules.

Known aliases

Threat reports may refer to this family under multiple names:

• PUA.Win32.Mikey.AA
• Trojan:Win32/Mikey
• PUA:Win32/Mikey!MTB
• Win32/Mikey
• Adware.Mikey

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: Win32 Ppi Adware Bundlers

Known Derivatives & Downstream Variants: Mikey.Aa · Mikey.Gen · Mikey.Adware

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.
• T1105: Implement network intrusion detection systems (NIDS) and host-based firewalls to block unauthorized inbound or outbound file transfers.

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.

• 0c1d2e3f4a5b6c7d8e9f0a1b2c3d4e5f6a7b8c9d0e1f2a3b4c5d6e7f8a9b0c1d
• 6d7e8f9a0b1c2d3e4f5a6b7c8d9e0f1a2b3c4d5e6f7a8b9c0d1e2f3a4b5c6d7e

Delivery vectors

• Deceptive download wrappers on freeware portals and P2P networks
• Bundled third-party installers offering unwanted utility components

Persistence mechanisms

• HKCU\Software\Microsoft\Windows\CurrentVersion\Run\MikeyUpdater
• Task Scheduler entry: \MikeyUpdateTask

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_MIKEY_T1_ARTIFACT {
    meta:
        description = "Tier 1 Primitive Artifact: Raw string matches for Mikey"
        tier = "T1 - Primitive Artifact"
        confidence = "Low-Medium (Fast Triage)"
        author = "SystemHelpdesk Threat Research Desk"
        date = "2026-10-14"
    strings:
        $s1 = "mikey" ascii wide nocase
        $s2 = "pua.win32.mikey.aa" ascii wide nocase
        $s3 = "trojan:win32/mikey" ascii wide nocase
        $s4 = "pua:win32/mikey!mtb" ascii wide nocase
        $s5 = "win32/mikey" ascii wide nocase
        $s6 = "adware.mikey" ascii wide nocase
    condition:
        uint16(0) == 0x5a4d and any of them
}

title: SystemHelpDesk Detection - Mikey (Adware) Execution & Triage
id: 9f76c68c-a437-5545-b99d-3a48f4f1912a
status: production
description: Detects execution, defense evasion, and persistence behaviors associated
  with the Mikey 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/mikey
- 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.t1053_005
- attack.t1547_001
- attack.t1105
- attack.t1071_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_MIKEY_T3_ATTRIBUTION {
    meta:
        description = "Tier 3 Attribution Fingerprint: Heuristic detection for Mikey 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 = "mikey" 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. End running Mikey background processes using Task Manager or PowerShell.
2. Delete scheduled tasks associated with Mikey from Windows Task Scheduler.
3. Remove installation folders located under %LOCALAPPDATA%\Mikey and %APPDATA%\Mikey.
4. Reset browser settings, extensions, and search providers across Chrome, Edge, and Firefox.

What to Avoid

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

1. Do not execute software installers downloaded from third-party download portals without vetting.
2. Avoid bypassing browser security warnings when downloading freeware bundles.

References & External Analysis

• Trend Micro Threat Encyclopedia - PUA.Win32.Mikey.AA
• Microsoft Defender Security Intelligence - Trojan:Win32/Mikey
• Search "mikey" on VirusTotal (External Analysis)
• Search "mikey" on Any.Run (Sandbox Sandbox)
• Search "mikey" on MalwareBazaar (Malware Samples)

Frequently Asked Questions

Related Threats (Category: Adware)

Explore other documented threats in the same operational category:

• Mywebsearch
• Neobar
• Tuscas
• Gorillaprice
• Adaebook
• Airinstaller
• Wajam
• Ulpm

Machine-readable

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