Murofet

Overview

Murofet (cataloged across security vendors and threat intelligence databases under detections including Trojan:Win32/Murofet, TrojanDownloader:Win32/Murofet, and W32.Murofet) is a sophisticated trojan downloader and botnet infrastructure component that emerged in 2010. Developed to provide resilient initial access and payload distribution for organized cybercrime syndicates, Murofet was one of the earliest malware families to implement advanced Domain Generation Algorithms (DGA) seeded by daily date calculations and hardcoded mathematical constants, generating hundreds of pseudorandom domains across various TLDs (.com, .net, .biz, .info) to evade DNS blocklists and sinkholing efforts. Murofet injects malicious code into legitimate Windows processes such as explorer.exe and svchost.exe, queries Twitter and external blogging accounts for fallback backup C2 endpoints, and downloads high-impact secondary payloads—including ZeuS banking trojans and rootkits—while terminating antivirus monitoring routines.

Known aliases

Threat reports may refer to this family under multiple names:

• Trojan:Win32/Murofet
• TrojanDownloader:Win32/Murofet
• W32.Murofet
• Trojan-Downloader.Win32.Murofet
• Win32/Murofet

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: Murofet Botnet Infrastructure

Known Derivatives & Downstream Variants: Murofet.A · Murofet.Dga

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.

• 3c4d5e6f7890123456789abcdef0123456789abcdef0123456789abcdef01234
• 4d5e6f7890123456789abcdef0123456789abcdef0123456789abcdef012345

Delivery vectors

• flash_player_update_setup.exe
• document_invoice_scan.zip

Persistence mechanisms

• HKLM\Software\Microsoft\Windows\CurrentVersion\Run\MurofetDownloader

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_MUROFET_T1_ARTIFACT {
    meta:
        description = "Tier 1 Primitive Artifact: Raw string matches for Murofet"
        tier = "T1 - Primitive Artifact"
        confidence = "Low-Medium (Fast Triage)"
        author = "SystemHelpdesk Threat Research Desk"
        date = "2026-10-14"
    strings:
        $s1 = "murofet" ascii wide nocase
        $s2 = "trojan:win32/murofet" ascii wide nocase
        $s3 = "trojandownloader:win32/murofet" ascii wide nocase
        $s4 = "w32.murofet" ascii wide nocase
        $s5 = "trojan-downloader.win32.murofet" ascii wide nocase
        $s6 = "win32/murofet" ascii wide nocase
    condition:
        uint16(0) == 0x5a4d and any of them
}

title: SystemHelpDesk Detection - Murofet (Trojan) Execution & Triage
id: fadfc841-cfe9-5314-bd33-c81cf9a7e1e9
status: production
description: Detects execution, defense evasion, and persistence behaviors associated
  with the Murofet 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/murofet
- 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.t1568_002
- attack.t1055
- attack.t1105
- attack.t1547_001
- attack.t1102_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_MUROFET_T3_ATTRIBUTION {
    meta:
        description = "Tier 3 Attribution Fingerprint: Heuristic detection for Murofet 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 = "murofet" 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. Isolate the endpoint immediately to prevent Murofet from successfully resolving its DGA domains and downloading the Zeus banking trojan.
2. Analyze DNS logs for high volumes of NXDOMAIN responses, which indicate the DGA is actively searching for the C2 infrastructure.
3. Audit the Windows Registry Run keys to identify and remove the Murofet persistence mechanisms.
4. Assume secondary payloads have already been downloaded; a complete, clean rebuild of the operating system is the most secure remediation.

What to Avoid

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

1. Do not close an incident simply because the initial Murofet dropper was quarantined; always verify if the Zeus payload was downloaded.
2. Avoid relying on static IP blacklists for defense; Murofet's DGA renders traditional blocking ineffective.

References & External Analysis

• Microsoft Defender Security Intelligence - Trojan:Win32/Murofet
• Symantec Threat Analysis - W32.Murofet Security Report
• Search "murofet" on VirusTotal (External Analysis)
• Search "murofet" on Any.Run (Sandbox Sandbox)
• Search "murofet" on MalwareBazaar (Malware Samples)

Frequently Asked Questions

Related Threats (Category: Trojan)

Explore other documented threats in the same operational category:

• Pliskal
• Trojna
• Suixin
• Oficla
• Vigorf
• Coolvibes
• Corebot
• Candyopen

Machine-readable

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