Virledi

Overview

Virus:Win32/Virledi is a destructive and parasitic **File Infector**. Unlike standard trojans which simply run alongside legitimate programs, Virledi actively searches for executable files (such as `.exe`, `.dll`, or `.scr`) on the compromised system and physically alters them, injecting its own malicious code into the host file. This makes remediation significantly more complex than simply deleting a single dropped file.

Understanding File Infectors (Viruses)
To an end-user, the system may become unstable, applications might crash frequently, or antivirus software might suddenly start detecting hundreds of files as malicious. For a security analyst, a Virledi infection is a severe incident. Because it alters legitimate system files, manually deleting the 'infected' files will destroy the operating system or the user's installed applications. The malware must be carefully 'disinfected' (the malicious code surgically removed from the host file) to restore functionality.

Execution and Infection Mechanics
Virledi typically arrives via infected removable media, network shares, or downloaded as a payload from another trojan. Upon execution (`T1204.002`), it establishes persistence (`T1547.001`). Its primary routine involves traversing the file system (`T1083`). When it finds a target executable, it opens the file, modifies the PE (Portable Executable) header (`T1055.001`), and appends its malicious code—usually to a new section or the end of the file. It then alters the entry point of the executable to point to the viral code. When the user later runs the 'infected' legitimate application (e.g., `calc.exe` or a game), the virus code executes first, infects more files, and then passes control back to the legitimate application, often hiding the infection from the user.

Indicators of Compromise & Impact
The primary impact is the widespread corruption of executable files and severe system instability. The most glaring IoC is an avalanche of EDR alerts indicating that hundreds of distinct, legitimate executables across the `C:\` drive are suddenly exhibiting malicious behavior or have changed their file hashes. File sizes of infected executables will be larger than their clean counterparts.

MITRE ATT&CK Techniques

Observed techniques used by this family, mapped to the MITRE ATT&CK framework:

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_VIRLEDI {
    meta:
        description = "Detects Virledi (trojan)"
        author = "SystemHelpdesk Boilerplate Generator"
        date = "2026-07-06"
    strings:
        $s1 = "virledi" ascii wide nocase
    condition:
        uint16(0) == 0x5a4d and any of them
}

Sigma Rule

title: Suspicious Virledi Activity
id: caa48d3d1b24c63f42d9942462c1f200
status: experimental
description: Detects generic indicators of the virledi malware family.
logsource:
    category: process_creation
    product: windows
detection:
    selection:
        Image|endswith:
            - '\cmd.exe'
            - '\powershell.exe'
        CommandLine|contains:
            - "*virledi*"
    condition: selection
level: medium

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 the virus from spreading to mapped network drives or removable USB media.
2. Do NOT attempt to manually delete infected files; this will likely destroy the operating system.
3. Deploy an enterprise-grade antivirus solution capable of deep 'cleaning' or 'disinfection'—the process of stripping the viral code while repairing the original PE header.
4. If disinfection fails or the system is too heavily corrupted, a complete wipe and OS rebuild from secure backups is the only safe remediation.

What to Avoid

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

1. Avoid executing any files from the infected system on a clean system, even standard utilities, as they are likely infected carriers.
2. Do not trust backups taken recently; file infectors often lay dormant, meaning your recent backups may contain infected executables.

References & External Analysis

• Search "virledi" on VirusTotal (External Analysis)

Frequently Asked Questions

Related Families (Category: trojan)

Explore other malware families in the same category:

• Rz0Auircb0Di
• Bzub
• Omaneat
• Genericrxbg
• Rvrat

Machine-readable

Get this profile as JSON: https://jordan123234-malware-families-explorer.static.hf.space/api/virledi.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.