Uiwao0Sam

Category: trojan · Aliases: Trojan.Generic.Uiwao0sam, Malware.Obfuscated.DGA, Win32/Trojan.Heur · Sample count (EMBER 2018): 1 · Enrichment: insufficient_information · Updated: 2026-07-01T17:16:56Z

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

Overview

Executive Summary

"Uiwao0sam" is a heuristic identifier for a highly obfuscated, generically detected Trojan or Dropper. The random, DGA-like (Domain Generation Algorithm) naming convention strongly suggests that this malware was generated dynamically by an automated exploit kit or malware builder to evade static antivirus signatures through constant polymorphic mutation.

Infection Vector and Technical Capabilities

Malware utilizing these randomized naming conventions is typically distributed "filelessly" via drive-by downloads originating from compromised websites (exploit kits) or as a secondary payload dropped by an initial access broker (like Emotet or Trickbot). Upon execution, this class of malware prioritizes rapid evasion and payload execution:

Heavy Obfuscation and Packing: The executable is heavily packed, encrypted, or virtualized (using tools like VMProtect or custom packers). This prevents security researchers and standard antivirus engines from analyzing its true code until it is unpacked in memory.
Process Injection: Rather than executing directly, the malware frequently utilizes Process Hollowing or DLL Injection to insert its malicious code into a legitimate Windows process (e.g., `explorer.exe` or `svchost.exe`). This allows it to bypass application whitelisting and hide its activity from the Task Manager.
Dynamic Infrastructure: The malware often relies on a Domain Generation Algorithm (DGA) to rapidly cycle through thousands of potential command-and-control (C2) domains, making IP/Domain blacklisting at the firewall ineffective.

Threat Assessment

Detection of highly obfuscated, randomly named files in critical system directories (like `%AppData%` or `%Temp%`) is a severe indicator of compromise (IoC). It almost guarantees that an advanced threat actor has bypassed initial perimeter defenses and achieved code execution on the endpoint.

Remediation and Eradication

Behavioral Analysis (EDR): Static signature-based AV is largely ineffective against polymorphic threats. Eradication requires an Endpoint Detection and Response (EDR) solution capable of monitoring and terminating processes based on malicious behavior (e.g., an unknown executable attempting to inject code into `svchost.exe`).
Network Isolation: Isolate the machine immediately to prevent the malware from phoning home to its C2 infrastructure or pivoting laterally across the network.
Complete Re-imaging: Due to the sophisticated evasion techniques employed (such as rootkit-like persistence), attempting to manually "clean" the system is highly risky. The most secure remediation is a complete bare-metal wipe and re-image from a trusted backup.

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: T1027.002 T1055 T1568.002 T1106

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_UIWAO0SAM {
    meta:
        description = "Detects Uiwao0Sam (trojan)"
        author = "SystemHelpdesk Boilerplate Generator"
        date = "2026-07-06"
    strings:
        $s1 = "uiwao0sam" ascii wide nocase
        $s2 = "trojan.generic.uiwao0sam" ascii wide nocase
        $s3 = "malware.obfuscated.dga" ascii wide nocase
        $s4 = "win32/trojan.heur" ascii wide nocase
    condition:
        uint16(0) == 0x5a4d and any of them
}

Sigma Rule

title: Suspicious Uiwao0Sam Activity
id: 80dca09ea137a0e6b82168857e70d633
status: experimental
description: Detects generic indicators of the uiwao0sam malware family.
logsource:
    category: process_creation
    product: windows
detection:
    selection:
        Image|endswith:
            - '\cmd.exe'
            - '\powershell.exe'
        CommandLine|contains:
            - "*uiwao0sam*"
            - "*trojan.generic.uiwao0sam*"
            - "*malware.obfuscated.dga*"
            - "*win32/trojan.heur*"
    condition: selection
level: medium

References & External Analysis

Search "uiwao0sam" on VirusTotal (External Analysis)

Frequently Asked Questions

How do I remove the Uiwao0Sam Trojan from Windows?

Manual removal of Uiwao0Sam 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 Uiwao0Sam a virus or a Trojan?

Uiwao0Sam is classified as a Trojan. Unlike traditional viruses that infect files, modern malware like Uiwao0Sam typically operates as a standalone payload designed to compromise systems, steal data, or deploy secondary stage implants.

What are the main symptoms of a Uiwao0Sam infection?

Symptoms of Uiwao0Sam 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 Uiwao0Sam 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/uiwao0sam.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.