Magistrcorr
Overview
Executive Summary
Magistrcorr is a heuristic detection applied to variants, remnants, or corrupted (hence "corr") versions of the notorious Win32/Magistr family. Magistr is a complex, destructive polymorphic virus and mass-mailing worm that caused widespread damage in the early 2000s. While active outbreaks are rare today on modern operating systems, the detection of a Magistr variant indicates a severe legacy infection or the presence of a highly destructive payload capable of wiping hard drives and destroying BIOS firmware.Infection Vector and Technical Capabilities
Magistr traditionally spreads by harvesting email addresses from the infected machine's address book (Outlook, Eudora) and mailing itself out with randomly generated subject lines and attachments. It also infects executable files (`.exe`, `.scr`) on local and mapped network drives. Upon execution, Magistr exhibits highly destructive behavior:- Polymorphic File Infection: Magistr infects PE (Portable Executable) files by injecting its code and altering the entry point. It is highly polymorphic, meaning the virus encrypts its own body with a different key for every infected file, making signature-based detection difficult.
- Mass-Mailing and Lateral Movement: It implements its own SMTP engine to mass-mail copies of infected files to harvested email addresses, utilizing the compromised host to attack external networks and internal peers.
- Destructive Payload (Time Bomb): The most critical threat is its delayed destructive payload. After a certain period (e.g., one month after initial infection), the virus attempts to overwrite the system's hard drive with garbage data (wiping the MBR and FAT) and attempts to flash (destroy) the motherboard's BIOS firmware, rendering the computer permanently unbootable (similar to the CIH/Chernobyl virus).
Threat Assessment
A Magistr detection is a critical security incident. The malware is exceptionally destructive. Even if the "corr" designation implies the file is corrupted and potentially non-functional, it indicates that a highly destructive, self-replicating virus was present on the network.Incident Response and Remediation
- Immediate Isolation (Hard Stop): Instantly isolate the machine from the network. If the destructive payload is suspected to be active, a hard power-off is recommended to prevent the hard drive from being wiped.
- Forensic Triage: Boot the machine from a clean, offline environment (e.g., a Linux Live USB) to scan the drive and attempt data recovery before attempting any disinfection.
- Complete System Rebuild: Because Magistr deeply infects system executables and can damage firmware, attempting to "clean" the files is highly unreliable. The machine must be completely wiped, the BIOS flashed with a clean image from the manufacturer, and the OS re-installed from a known-good baseline.
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: T1485 T1561.002 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_MAGISTRCORR {
meta:
description = "Detects Magistrcorr (advanced_threat)"
author = "SystemHelpdesk Boilerplate Generator"
date = "2026-07-06"
strings:
$s1 = "magistrcorr" ascii wide nocase
$s2 = "virus.win32.magistr" ascii wide nocase
$s3 = "worm.magistr" ascii wide nocase
$s4 = "win32/magistr.corrupt" ascii wide nocase
condition:
uint16(0) == 0x5a4d and any of them
}Sigma Rule
title: Suspicious Magistrcorr Activity
id: 3550c6092cb3cb3c2ceabf6fe90d661b
status: experimental
description: Detects generic indicators of the magistrcorr malware family.
logsource:
category: process_creation
product: windows
detection:
selection:
Image|endswith:
- '\cmd.exe'
- '\powershell.exe'
CommandLine|contains:
- "*magistrcorr*"
- "*virus.win32.magistr*"
- "*worm.magistr*"
- "*win32/magistr.corrupt*"
condition: selection
level: mediumReferences & External Analysis
- Search "magistrcorr" on VirusTotal (External Analysis)
Frequently Asked Questions
How do I remove the Magistrcorr Advanced_Threat from Windows?
Manual removal of Magistrcorr 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 Magistrcorr a virus or a Advanced_Threat?
Magistrcorr is classified as a Advanced_Threat. Unlike traditional viruses that infect files, modern malware like Magistrcorr typically operates as a standalone payload designed to compromise systems, steal data, or deploy secondary stage implants.
What are the main symptoms of a Magistrcorr infection?
Symptoms of Magistrcorr 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: advanced_threat)
Explore other malware families in the same category:
Protect Your Network Against Advanced_Threats
Want to prevent Magistrcorr and similar threats from compromising your organization? Read our comprehensive defensive guide: Suspect an Infection? What to do.
Machine-readable
Get this profile as JSON: https://jordan123234-malware-families-explorer.static.hf.space/api/magistrcorr.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.