Azden
Table of Contents
Overview
Azden (classified across security vendors as Ransom:Win32/Azden, Trojan-Ransom.Win32.Azden, and Win32/Azden) is a targeted Windows crypto-ransomware family designed for corporate network extortion. Propagated through brute-forced Remote Desktop Protocol (RDP) sessions, compromised enterprise VPN credentials, and malicious email droppers, Azden executes high-speed file encryption across local drives and accessible network shares. Prior to encrypting files, Azden terminates database and hypervisor services (such as MSSQL, MySQL, Oracle, and Veeam services) to release file locks on critical business databases. It deletes volume shadow copies using 'vssadmin delete shadows /all /quiet' and disables Windows boot recovery prompts via bcdedit ('bcdedit /set {default} bootstatuspolicy ignoreallfailures'). Azden encrypts user documents, financial databases, virtual machine disks, and system archives using AES-256 in CBC mode, appending the '.azden' extension to encrypted files. It encrypts the AES session key using an embedded 2048-bit RSA master public key and creates ransom notes ('HOW_TO_RESTORE_AZDEN.txt') in all processed directories.
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/Azden.A · Ransom:Win32/Azden.B
MITRE ATT&CK Techniques
This family has been observed using the following ATT&CK techniques: T1486 · T1490 · T1489 · T1083 · T1027
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-BDA | Binary De-obfuscation & Unpacking | Analyze | T1027 | Utilize memory dump scanners and entropy inspection to unpack encrypted stagers during process creation. |
D3-FDA | File Directory Access Auditing | Detect | T1083 | Audit and alert on high-frequency recursive directory queries executed by non-system and unclassified binaries. |
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-SPP | Service Protection Policies | Harden | T1489 | Configure strict DACLs on Windows Service Control Manager to prevent unauthorized termination of antivirus and backup services. |
D3-VSS | Volume Shadow & Snapshot Hardening | Harden | T1490 | Block execution of vssadmin.exe and wmic shadowcopy delete; maintain air-gapped immutable backup repositories. |
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_AZDEN_T1_ARTIFACT {
meta:
description = "Tier 1 Primitive Artifact: Raw string matches for Azden"
tier = "T1 - Primitive Artifact"
confidence = "Low-Medium (Fast Triage)"
author = "SystemHelpdesk Threat Research Desk"
date = "2026-10-14"
strings:
$s1 = "azden" ascii wide nocase
$s2 = "ransom:win32/azden" ascii wide nocase
$s3 = "trojan-ransom.win32.azden" ascii wide nocase
$s4 = "win32/azden" ascii wide nocase
$s5 = "ransom.azden" ascii wide nocase
$s6 = "azden ransomware" 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 - Azden (Ransomware) Execution & Triage
id: de0edd58-b18b-54ba-8f3f-73b6e6d8844c
status: production
description: Detects execution, defense evasion, and persistence behaviors associated
with the Azden 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/azden
- 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.t1489
- attack.t1083
- attack.t1027
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_AZDEN_T3_ATTRIBUTION {
meta:
description = "Tier 3 Attribution Fingerprint: Heuristic detection for Azden 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 = "azden" 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/Azden
- Trend Micro Threat Encyclopedia - Ransom.Win32.Azden
- Search "azden" on VirusTotal (External Analysis)
- Search "azden" on Any.Run (Sandbox Sandbox)
- Search "azden" on MalwareBazaar (Malware Samples)
Frequently Asked Questions
What is Ransom:Win32/Azden?
Azden is a corporate-targeting crypto-ransomware that encrypts business databases and network shares using AES-256 and RSA-2048.
How does Azden disable system recovery mechanisms?
It executes vssadmin commands to delete volume shadow copies and bcdedit commands to suppress startup recovery options.
How does Azden compromise corporate networks?
Adversaries deploy Azden via brute-forced RDP accounts, compromised VPN credentials, and spear-phishing loaders.
Can files encrypted with the .azden extension be decrypted for free?
No public decrypter exists because Azden uses strong AES-256 with keys protected by an asymmetric RSA master public key.
What incident response actions should be taken during an Azden attack?
Isolate affected network segments immediately, capture memory images of infected hosts, and restore data from verified air-gapped backups.
How do I remove Azden from Windows?
Manual removal of Azden 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.
What are the main symptoms of a Azden infection?
Symptoms of Azden 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 Azden 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/azden.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.