Nmkfxmdtnmoi

Category: trojan · Aliases: Generic.DGA, Suspicious.Nmkfxmdtnmoi, Heur.Nmkfxmdtnmoi · Sample count (EMBER 2018): 1 · Enrichment: insufficient_information · Updated: 2026-07-01T16:27:47Z

Category: TrojanActor: Unknown / CybercriminalIndustry: Global / OpportunisticMotivation: Opportunistic

Overview

Executive Summary

"Nmkfxmdtnmoi" is a machine-generated detection signature utilized by advanced heuristic antivirus engines. It does not identify a specific, named malware family, but rather flags an executable file or domain name that exhibits characteristics strongly associated with Domain Generation Algorithms (DGAs) or heavily obfuscated malware droppers.

Heuristic Detection and Behavioral Context

The pseudo-random string "Nmkfxmdtnmoi" is typical of the naming conventions used by security vendors when an unknown file triggers behavioral alerts but fails to match a known static signature. Files or network requests flagged with this identifier frequently demonstrate:

DGA Communication: The malware attempts to resolve DNS queries for long, random, nonsensical domain names. This is a common tactic used by botnets and trojans to locate their command-and-control (C2) servers while evading static IP blocklists.
High Code Entropy: The executable is heavily packed or encrypted using custom algorithms, aiming to hide the true malicious payload from static analysis and reverse engineering tools.
Process Injection: The program attempts to execute Windows APIs to inject code into legitimate system processes, attempting to bypass local firewalls and execute stealthily.

Security and Risk Implications

While a generic detection lacks the context of a known family, an Nmkfxmdtnmoi alert is a severe security event. It frequently indicates the presence of a zero-day threat or a highly evasive initial access dropper designed to establish a beachhead for a larger, targeted attack.

Incident Response Guidelines

Immediate Network Isolation: Isolate the endpoint from the corporate network immediately to halt the DGA communication and prevent the potential download of secondary payloads.
DNS Log Analysis: Analyze corporate DNS logs for the specific pseudo-random strings generated during the alert to identify other potentially compromised hosts beaconing to the same infrastructure.
Sandbox Detonation: Extract the flagged executable and submit it to an isolated malware sandbox to monitor its behavior, identify the true payload, and generate actionable Indicators of Compromise (IOCs).

Known aliases

Threat reports may refer to this family under multiple names:

MITRE ATT&CK Techniques

This family has been observed using the following ATT&CK techniques: T1568.002 T1027 T1055

Generated Detections (Boilerplate)

These YARA and Sigma rules are auto-generated based on the family name and aliases. They must be heavily tuned before deployment in a production environment.

YARA Rule

rule MALWARE_WIN_NMKFXMDTNMOI {
    meta:
        description = "Detects Nmkfxmdtnmoi (trojan)"
        author = "SystemHelpdesk Boilerplate Generator"
        date = "2026-07-06"
    strings:
        $s1 = "nmkfxmdtnmoi" ascii wide nocase
        $s2 = "generic.dga" ascii wide nocase
        $s3 = "suspicious.nmkfxmdtnmoi" ascii wide nocase
        $s4 = "heur.nmkfxmdtnmoi" ascii wide nocase
    condition:
        uint16(0) == 0x5a4d and any of them
}

Sigma Rule

title: Suspicious Nmkfxmdtnmoi Activity
id: 57772032c41d0cda73a450f16a7d10d8
status: experimental
description: Detects generic indicators of the nmkfxmdtnmoi malware family.
logsource:
    category: process_creation
    product: windows
detection:
    selection:
        Image|endswith:
            - '\cmd.exe'
            - '\powershell.exe'
        CommandLine|contains:
            - "*nmkfxmdtnmoi*"
            - "*generic.dga*"
            - "*suspicious.nmkfxmdtnmoi*"
            - "*heur.nmkfxmdtnmoi*"
    condition: selection
level: medium

References & External Analysis

Search "nmkfxmdtnmoi" on VirusTotal (External Analysis)

Frequently Asked Questions

How do I remove the Nmkfxmdtnmoi Trojan from Windows?

Manual removal of Nmkfxmdtnmoi is highly discouraged as it may leave persistence mechanisms intact. We recommend disconnecting the device from the internet and utilizing a professional incident response service or enterprise-grade EDR software to conduct a full forensic sweep.

Is Nmkfxmdtnmoi a virus or a Trojan?

Nmkfxmdtnmoi is classified as a Trojan. Unlike traditional viruses that infect files, modern malware like Nmkfxmdtnmoi typically operates as a standalone payload designed to compromise systems, steal data, or deploy secondary stage implants.

What are the main symptoms of a Nmkfxmdtnmoi infection?

Symptoms of Nmkfxmdtnmoi can include unexpected system slowness, unauthorized outbound network traffic to unknown IP addresses, disabled security software, and suspicious background processes running from AppData or Temp directories.

Related Families (Category: trojan)

Explore other malware families in the same category:

Protect Your Network Against Trojans

Want to prevent Nmkfxmdtnmoi and similar threats from compromising your organization? Read our comprehensive defensive guide: Banking Trojan Protection.

Need help with an active incident? Published by the SystemHelpdesk team.

Machine-readable

Get this profile as JSON: https://jordanricky1604-ship-it.github.io/malware-families-catalog/api/nmkfxmdtnmoi.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.