Vabushky
Table of Contents
Overview
Vabushky (cataloged across security vendor databases and threat intelligence feeds under signatures including Ransom:Win32/Vabushky, Trojan-Ransom.Win32.Vabushky, and Trojan.Vabushky) is a destructive crypto-ransomware and extortion screen-locker threat active since 2016. Infiltrating endpoints primarily through malicious spam email attachments containing macro-enabled documents or exploit kit redirections, Vabushky immediately initiates destructive host operations. It terminates active database, backup, and security services before traversing local drives, removable disks, and mapped network shares. Vabushky encrypts user documents, spreadsheets, images, and archives using AES-256 with an embedded RSA public key, appending a custom identifier extension to locked files. Furthermore, it deletes Volume Shadow Copies (vssadmin delete shadows /all /quiet), disables Windows Startup Repair (bcdedit /set {default} recoveryenabled No), and presents an extortion lockscreen warning demanding cryptocurrency payment for file restoration.
Known aliases
Threat reports may refer to this family under multiple names:
Family Pedigree & Lineage
Malware authors regularly fork and iterate upon existing codebases. Observed upstream lineage and downstream variants for this family include:
Known Derivatives & Downstream Variants: Ransom:Win32/Vabushky.A · Ransom:Win32/Vabushky.B
MITRE ATT&CK Techniques
This family has been observed using the following ATT&CK techniques: T1486 · T1490 · T1547.001 · T1082 · T1071.001
Tactical Mitigations
Based on the techniques used by this family, consider the following defensive strategies:
- T1071.001: Implement web filtering and SSL/TLS inspection to detect malicious command and control (C2) traffic hiding in HTTP/HTTPS.
MITRE D3FEND™ Defensive Countermeasures
Defensive techniques mapped to counter the offensive tradecraft observed in this family (via the MITRE D3FEND matrix):
| D3FEND ID | Countermeasure Name | Tactic | Countered ATT&CK | Defensive Guidance |
|---|---|---|---|---|
D3-WAF | Web Content Filtering & Inspection | Filter | T1071.001 | Block newly registered domains (NRDs) and inspect HTTP Host and URI headers for known C2 profiles. |
D3-SDA | System Discovery Analysis | Detect | T1082 | Alert on rapid enumerations of systeminfo, hostname, and registry hardware trees in short intervals. |
D3-FAED | File Alteration Early Detection | Detect | T1486 | Deploy canary files and monitor mass rename/encryption I/O spikes to terminate ransomware threads immediately. |
D3-VSS | Volume Shadow & Snapshot Hardening | Harden | T1490 | Block execution of vssadmin.exe and wmic shadowcopy delete; maintain air-gapped immutable backup repositories. |
D3-RPM | Registry Persistence Monitoring | Detect | T1547.001 | Audit and restrict write privileges to user and machine-level Registry Run/RunOnce keys using Endpoint Privilege Management. |
Tiered Detection Rules (Cisco CAIRN Model)
Modern threat detection requires multi-layered rule engineering. We classify detections into three operational tiers based on signal fidelity:
Tier 1 Primitive Artifact Rule (Fast Triage)
Matches raw strings and file markers. Vulnerable to binary repacking and simple obfuscation.
rule MALWARE_WIN_VABUSHKY_T1_ARTIFACT {
meta:
description = "Tier 1 Primitive Artifact: Raw string matches for Vabushky"
tier = "T1 - Primitive Artifact"
confidence = "Low-Medium (Fast Triage)"
author = "SystemHelpdesk Threat Research Desk"
date = "2026-10-14"
strings:
$s1 = "vabushky" ascii wide nocase
$s2 = "ransom:win32/vabushky" ascii wide nocase
$s3 = "trojan-ransom.win32.vabushky" ascii wide nocase
$s4 = "trojan.vabushky" ascii wide nocase
$s5 = "win32/vabushky" ascii wide nocase
$s6 = "ransom:win32/vabushky.a" ascii wide nocase
condition:
uint16(0) == 0x5a4d and any of them
}Tier 2 Behavioral Context Rule (Process Chains & Sigma)
Tracks parent-child process anomalies and suspicious scripting telemetry. Resilient against file renames.
title: SystemHelpDesk Detection - Vabushky (Ransomware) Execution & Triage
id: 40f9c5e4-7086-5dd0-89dd-4724c077f834
status: production
description: Detects execution, defense evasion, and persistence behaviors associated
with the Vabushky malware family. Detects volume shadow copy deletion, boot status
tampering, and recovery inhibition characteristic of modern ransomware operations.
references:
- https://malware-families-catalog.systemhelpdesk.com/families/vabushky
- https://malware-families-catalog.systemhelpdesk.com/defensive/ransomware-protection
- https://malware-families-catalog.systemhelpdesk.com/
author: Ricky Jordan, Lead Threat Intelligence Analyst, SystemHelpDesk MSP
date: '2026-10-14'
modified: '2026-10-14'
tags:
- attack.ransomware
- author.ricky-jordan
- source.systemhelpdesk-mfc
- attack.t1486
- attack.t1490
- attack.t1547_001
- attack.t1082
- attack.t1071_001
logsource:
category: process_creation
product: windows
detection:
selection_process:
Image|endswith:
- \vssadmin.exe
- \wmic.exe
- \wbadmin.exe
- \bcdedit.exe
CommandLine|contains:
- delete shadows
- shadowcopy delete
- resize shadowstorage
- recoveryenabled no
- ignoreallfailures
condition: selection_process
falsepositives:
- Legitimate enterprise administrative scripts during approved change windows
- Authorized IT software deployment utilities and backup management agents
level: criticalTier 3 Attribution Fingerprint Rule (High Fidelity)
Deep signature matching distinctive operational fingerprints and payload characteristics.
rule MALWARE_WIN_VABUSHKY_T3_ATTRIBUTION {
meta:
description = "Tier 3 Attribution Fingerprint: Heuristic detection for Vabushky tradecraft"
tier = "T3 - Attribution Fingerprint"
confidence = "High (Confirmed Family Signature)"
author = "SystemHelpdesk Threat Research Desk"
date = "2026-10-14"
strings:
// Core family identifier & heuristic payload signatures
$attrib_str = "vabushky" ascii wide nocase
$pe_magic = "MZ" ascii
$net_marker = "http" ascii nocase
condition:
uint16(0) == 0x5a4d and ($attrib_str and $net_marker) and filesize < 15MB
}References & External Analysis
- Microsoft Defender Threat Encyclopedia - Ransom:Win32/Vabushky
- Trend Micro Threat Encyclopedia - Ransom.Win32.Vabushky
- Search "vabushky" on VirusTotal (External Analysis)
- Search "vabushky" on Any.Run (Sandbox Sandbox)
- Search "vabushky" on MalwareBazaar (Malware Samples)
Frequently Asked Questions
What is Ransom:Win32/Vabushky?
Vabushky is a crypto-ransomware family that encrypts user documents with AES-256 and displays an extortion lockscreen demanding cryptocurrency payment.
How does Vabushky prevent victims from restoring files?
It executes vssadmin to delete all Volume Shadow Copies and uses bcdedit to disable Windows automated startup recovery.
What file types are targeted by Vabushky?
It targets personal documents, spreadsheets, financial databases, source code archives, and multimedia files across local and network drives.
How does Vabushky spread to computers?
It is delivered through malicious spam email attachments, compromised websites via exploit kits, and exposed Remote Desktop Protocol (RDP) connections.
How can organizations protect against Vabushky ransomware?
Maintain offline and immutable backups, disable SMBv1 and open RDP ports, enable Controlled Folder Access in Windows Defender, and enforce multi-factor authentication.
How do I remove the Vabushky Ransomware from Windows?
Manual removal of Vabushky 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 Vabushky a virus or a Ransomware?
Vabushky is classified as a Ransomware. Unlike traditional viruses that infect files, modern malware like Vabushky typically operates as a standalone payload designed to compromise systems, steal data, or deploy secondary stage implants.
What are the main symptoms of a Vabushky infection?
Symptoms of Vabushky 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.
Protect Your Network Against Ransomwares
Want to prevent Vabushky and similar threats from compromising your organization? Read our comprehensive defensive guide: Ransomware Containment & Incident Response.
📣 Threat Intel Correction or Update?
Notice an outdated IOC, unlisted alias, or disputed attribution? Threat researchers are invited to propose an update on GitHub or contact the SystemHelpDesk research desk. All community revisions are credited in our public CHANGELOG.
Machine-readable
Get this profile as JSON: https://malware-families-catalog.systemhelpdesk.com/api/vabushky.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.