Dovs

Overview

Dovs (cataloged in antivirus vendor databases under detections including Trojan:Win32/Dovs, TrojanDownloader:Win32/Dovs, and Win32/Dovs) is a stealthy Windows trojan downloader active since 2013. Engineered to serve as an initial access and payload delivery stager, Dovs typically infiltrates systems via malicious email attachments, cracked software packages, or exploit kits. Upon execution, Dovs decrypts embedded configuration parameters, verifies host network connectivity, and reaches out to hardcoded remote command-and-control (C2) servers over HTTP or HTTPS. It downloads secondary malicious executables—such as credential stealers, cryptocurrency miners, or rogue security software—saving them into temporary directories like %Temp% or %AppData% with randomly generated filenames. Dovs establishes persistence by modifying Windows registry Run keys or configuring scheduled tasks to ensure automatic reactivation across reboots.

Known aliases

Threat reports may refer to this family under multiple names:

• Trojan:Win32/Dovs
• TrojanDownloader:Win32/Dovs
• Win32/Dovs

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 Trojan Downloader Toolkits

Known Derivatives & Downstream Variants: Dovs.A · Dovs.B

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:

• 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.

• e3f4a5b6c7d8e9f0a1b2c3d4e5f6a7b8c9d0e1f2a3b4c5d6e7f8a9b0c1d2e3f4
• f4a5b6c7d8e9f0a1b2c3d4e5f6a7b8c9d0e1f2a3b4c5d6e7f8a9b0c1d2e3f4a5

Delivery vectors

• setup_dovs.exe
• update_patch.exe

Persistence mechanisms

• HKCU\Software\Microsoft\Windows\CurrentVersion\Run\DovsService
• %Temp%\dovs_loader.exe

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_DOVS_T1_ARTIFACT {
    meta:
        description = "Tier 1 Primitive Artifact: Raw string matches for Dovs"
        tier = "T1 - Primitive Artifact"
        confidence = "Low-Medium (Fast Triage)"
        author = "SystemHelpdesk Threat Research Desk"
        date = "2026-10-14"
    strings:
        $s1 = "dovs" ascii wide nocase
        $s2 = "trojan:win32/dovs" ascii wide nocase
        $s3 = "trojandownloader:win32/dovs" ascii wide nocase
        $s4 = "win32/dovs" ascii wide nocase
    condition:
        uint16(0) == 0x5a4d and any of them
}

title: SystemHelpDesk Detection - Dovs (Trojan) Execution & Triage
id: af3d8072-e129-5722-9962-7282b3b260a9
status: production
description: Detects execution, defense evasion, and persistence behaviors associated
  with the Dovs 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/dovs
- https://malware-families-catalog.systemhelpdesk.com/defensive/downloader-dropper-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.trojan
- author.ricky-jordan
- source.systemhelpdesk-mfc
- attack.t1105
- attack.t1566_001
- attack.t1547_001
- attack.t1059_003
- 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_DOVS_T3_ATTRIBUTION {
    meta:
        description = "Tier 3 Attribution Fingerprint: Heuristic detection for Dovs 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 = "dovs" 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 endpoint to halt the active exfiltration of browsing telemetry and the downloading of further adware modules.
2. Audit Windows Group Policies and the Registry to remove any forced extension installation policies (ExtensionInstallForcelist) created by the adware.
3. Deploy an enterprise adware removal tool (e.g., AdwCleaner) to locate and strip the deeply embedded registry hooks and watchdog services.
4. Force a complete reset of all installed web browsers to factory defaults to eradicate the rogue extensions and restore the homepage.

What to Avoid

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

1. Do not rely solely on the browser's 'remove extension' button; Dovs frequently uses GPOs and watchdog services to immediately reinstall itself.
2. Avoid ignoring the infection; scareware campaigns can trick employees into providing corporate credit card details or remote access to fake 'support' agents.

References & External Analysis

• Microsoft Defender Security Intelligence - Trojan:Win32/Dovs
• Fortinet FortiGuard Labs - Threat Encyclopedia: Win32/Dovs
• Search "dovs" on VirusTotal (External Analysis)
• Search "dovs" on Any.Run (Sandbox Sandbox)
• Search "dovs" on MalwareBazaar (Malware Samples)

Frequently Asked Questions

Related Threats (Category: Trojan)

Explore other documented threats in the same operational category:

• Genericrxby
• Ggdoor
• Jacard
• Ursnifdropper
• Scar
• Bmkfxasqf6Ki
• Regrun
• Uploader

Machine-readable

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