Mabezat

Overview

Virus:Win32/Mabezat is a highly destructive, polymorphic file infector and network worm that aggressively appends malicious code to legitimate executable files (`.exe`) across local drives, removable media, and mapped network shares, while simultaneously acting as a mass-mailing worm to propagate via email.

Understanding Mabezat
To the end-user, a Mabezat infection manifests as severe system instability. Legitimate applications crash, and the system may become unresponsive. Furthermore, the user's contacts begin receiving spam emails originating from the infected machine. For incident responders, Mabezat is a chaotic, multi-vector threat. Unlike modern trojans that simply drop a payload, Mabezat physically modifies and corrupts thousands of legitimate, benign files (`T1027.001`). If Mabezat gains access to a corporate file share, it will systematically infect every executable it can write to, rapidly crippling the network.

Execution and Evasion Strategies
Mabezat is introduced via infected executables, USB drives, or malicious email attachments. Upon execution, the virus decrypts its payload in memory. It searches the local hard drive for `.exe` files, modifies the entry point, and appends its polymorphic code to the file. It also creates hidden, malicious autorun files (`autorun.inf`) on all connected USB drives and network shares (`T1091`). Concurrently, Mabezat harvests email addresses from the local machine (e.g., from Outlook address books or cached web files) (`T1114.001`) and utilizes a built-in SMTP engine to email copies of itself to those contacts (`T1566.001`), utilizing deceptive subject lines.

Indicators of Compromise & Impact
The impact is massive file corruption, widespread system failure, and severe reputational damage due to the outbound spam. EDR platforms will flag a single process rapidly reading and modifying hundreds of executable files (`T1485`). Network logs will show massive spikes in outbound SMTP (TCP 25) traffic. Security analysts will notice the proliferation of hidden `autorun.inf` files across file shares and USB drives, alongside altered file sizes for standard Windows utilities.

MITRE ATT&CK Techniques

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

Tactical Mitigations

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

• T1566.001: Scan email attachments for malicious macros, scripts, or suspicious archive files.

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

Sigma Rule

title: Suspicious Mabezat Activity
id: eb38c3fe31fbb6033a8020455da21e6f
status: experimental
description: Detects generic indicators of the mabezat malware family.
logsource:
    category: process_creation
    product: windows
detection:
    selection:
        Image|endswith:
            - '\cmd.exe'
            - '\powershell.exe'
        CommandLine|contains:
            - "*mabezat*"
    condition: selection
level: medium

Containment & Response Steps

Ordered checklist for responders. Adapt to your environment and engage professional support for active incidents.

1. Instantly sever the infected endpoint from the network to halt the rapid file share propagation and prevent the massive outbound spam campaigns.
2. Enforce strict network segmentation, immediately blocking outbound SMTP (TCP 25) traffic from standard user workstations.
3. Do NOT attempt to simply delete the infected files; because Mabezat infects legitimate system binaries, deleting them will destroy the OS.
4. Deploy specialized antivirus 'disinfection' routines to strip the appended virus code; if unavailable, a complete OS rebuild is mandatory.

What to Avoid

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

1. Do not execute any files from a network share or plug in USB drives while Mabezat is active; you will instantly spread the virus.
2. Avoid assuming standard file deletion works; the virus code is physically merged into the legitimate applications.

References & External Analysis

• Search "mabezat" on VirusTotal (External Analysis)

Frequently Asked Questions

Related Families (Category: trojan)

Explore other malware families in the same category:

• Rozena
• Uiwao0Sam
• Glupteba
• Chthonic
• Woool

Machine-readable

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