Omyaamfbexii

Category: ransomware · Aliases: Generic.Omyaamfbexii, Trojan.Generic, DGA.Generic · Sample count (EMBER 2018): 1 · Enrichment: insufficient_information · Updated: 2026-07-01T16:03:45Z

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

Overview

Executive Summary

"Omyaamfbexii" is a generic detection identifier rather than a distinct, named malware family. It is typically generated automatically by antivirus engines—often via machine learning or heuristic analysis—to flag highly obfuscated executables or domains generated by a Domain Generation Algorithm (DGA) that exhibit malicious characteristics.

Behavioral Analysis and Heuristic Triggers

The seemingly random string "omyaamfbexii" is characteristic of automated naming conventions used by security vendors when a file matches a behavioral profile of a trojan, but lacks a specific signature tying it to a known family (like Emotet or Trickbot). Files flagged with this identifier frequently exhibit the following behaviors during dynamic analysis (sandboxing):

Heavy Obfuscation: The executable is often packed using custom or commercial packers (e.g., UPX, Themida) to thwart static analysis and reverse engineering.
DGA Communications: The malware may attempt to resolve domain names consisting of pseudo-random character strings, indicating the use of a Domain Generation Algorithm to locate its command-and-control (C2) server.
Process Injection: It frequently attempts to inject malicious code into legitimate system processes (`explorer.exe`, `svchost.exe`) to hide its execution and bypass local firewalls.

Security Implications

While a generic detection might seem less threatening than a named APT group, it often indicates the presence of a novel, zero-day threat, or a heavily mutated variant of existing malware. These files are typically downloaders or initial access trojans designed to pave the way for ransomware deployments.

Investigation and Remediation

File Isolation and Analysis: Immediately isolate the endpoint where the file was detected. Submit the flagged executable to an advanced malware sandbox or a malware analysis team to determine its true capabilities.
Network Forensics: Analyze network logs for DNS queries matching random strings, which may indicate successful DGA communication and provide IOCs (Indicators of Compromise) for blocking.
Comprehensive Sweeps: Utilize the IOCs gathered from dynamic analysis to sweep the entire enterprise network for lateral movement or secondary infections.

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: T1059 T1568.002 T1027

Tactical Mitigations

Based on the techniques used by this family, consider the following defensive strategies:

T1059: Restrict execution of scripting languages such as PowerShell, VBScript, or Python to authorized administrators. Enforce Script Block Logging.

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

Sigma Rule

title: Suspicious Omyaamfbexii Activity
id: fe031985b245bf1f9592dcc6ea448558
status: experimental
description: Detects generic indicators of the omyaamfbexii malware family.
logsource:
    category: process_creation
    product: windows
detection:
    selection:
        Image|endswith:
            - '\cmd.exe'
            - '\powershell.exe'
        CommandLine|contains:
            - "*omyaamfbexii*"
            - "*generic.omyaamfbexii*"
            - "*trojan.generic*"
            - "*dga.generic*"
    condition: selection
level: medium

References & External Analysis

Search "omyaamfbexii" on VirusTotal (External Analysis)

Frequently Asked Questions

How do I remove the Omyaamfbexii Ransomware from Windows?

Manual removal of Omyaamfbexii 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 Omyaamfbexii a virus or a Ransomware?

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

What are the main symptoms of a Omyaamfbexii infection?

Symptoms of Omyaamfbexii 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: ransomware)

Explore other malware families in the same category:

Protect Your Network Against Ransomwares

Want to prevent Omyaamfbexii and similar threats from compromising your organization? Read our comprehensive defensive guide: Ransomware Protection Guide.

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/omyaamfbexii.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.