Deleter
Table of Contents
Overview
Trojan:Win32/Deleter (often associated with Wiper malware) is a highly destructive trojan whose primary and singular objective is to permanently erase, corrupt, or render inaccessible data and critical system files on the infected endpoint. Unlike ransomware, which encrypts data for extortion, Deleter aims for pure sabotage and destruction.
Understanding Deleter (Data Wiper)
To an end-user, a Deleter infection is catastrophic: the system suddenly crashes (BSOD), fails to reboot (reporting missing operating system files), or user directories are found completely empty. For a security team, a wiper attack is often indicative of a highly motivated, state-sponsored adversary (APT) aiming to disrupt operations, cover their tracks after a data breach, or cause maximal financial damage to an organization.
Execution and Destructive Mechanics
Wipers are typically deployed manually by attackers after they have gained deep network access and escalated privileges to SYSTEM or Domain Admin (`T1078`). Once executed (`T1204.002`), Deleter acts swiftly. It bypasses the Windows Recycle Bin, using APIs to directly overwrite file contents with zeros or random garbage data before deleting the file pointers (`T1485`). Advanced variants attempt to overwrite the Master Boot Record (MBR) or GUID Partition Table (GPT) (`T1561.001`, `T1561.002`), rendering the operating system completely unbootable. To prevent forensic recovery, it will systematically delete Volume Shadow Copies and clear Windows Event Logs (`T1490`, `T1070.001`).
Indicators of Compromise & Impact
The impact is total loss of data and complete system failure. Host-based IoCs include sudden, massive spikes in disk I/O activity followed by immediate system instability, EDR alerts for the execution of commands like `vssadmin.exe delete shadows`, unauthorized raw disk access (`\\.\PhysicalDrive0`), and the deletion of critical Windows directory files. There are typically no network IoCs during the wiping phase, as the goal is localized destruction.
MITRE ATT&CK Techniques
Observed techniques used by this family, mapped to our technical analysis hubs and the official MITRE ATT&CK framework:
| Technique | Name | Tactic | Official Spec |
|---|---|---|---|
T1485 | Data Destruction | Impact | ATT&CK ↗ |
T1561.001 | Disk Wipe: Disk Content Wipe | Impact | ATT&CK ↗ |
T1561.002 | Disk Wipe: Disk Structure Wipe (MBR Overwrite) | Impact | ATT&CK ↗ |
T1490 | Inhibit System Recovery | Impact | ATT&CK ↗ |
T1070.001 | Indicator Removal on Host: Clear Windows Event Logs | Defense Evasion | ATT&CK ↗ |
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-WORM | Immutable Backup Storage | Harden | T1485 | Store primary backups in Write-Once-Read-Many (WORM) cloud repositories protected by multi-party out-of-band credentials. |
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_DELETER_T1_ARTIFACT {
meta:
description = "Tier 1 Primitive Artifact: Raw string matches for Deleter"
tier = "T1 - Primitive Artifact"
confidence = "Low-Medium (Fast Triage)"
author = "SystemHelpdesk Threat Research Desk"
date = "2026-10-14"
strings:
$s1 = "deleter" 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 - Deleter (Ransomware) Execution & Triage
id: dea35e44-6dbf-5214-baa6-2abe72411585
status: production
description: Detects execution, defense evasion, and persistence behaviors associated
with the Deleter 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/deleter
- 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.t1561_001
- attack.t1490
- attack.t1485
- attack.t1070_001
- attack.t1561_002
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_DELETER_T3_ATTRIBUTION {
meta:
description = "Tier 3 Attribution Fingerprint: Heuristic detection for Deleter 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 = "deleter" 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
}Containment & Response Steps
Ordered checklist for responders. Adapt to your environment and engage professional support for active incidents.
- IMMEDIATELY physically power down the infected endpoint (pull the plug, do not perform a graceful shutdown) to halt the wiping process and preserve whatever data remains on the disk.
- Do not attempt to reboot the machine; if the MBR is wiped, the machine will not boot, and the boot process itself may overwrite recoverable data.
- Remove the hard drive and connect it to an isolated forensic workstation using a write-blocker to attempt data carving and recovery of partially wiped files.
- Initiate disaster recovery protocols and restore the affected systems from secure, offline backups (e.g., tape drives) that were not connected to the network during the attack.
What to Avoid
Common mistakes during response to this family that can destroy evidence, spread the infection, or worsen recovery.
- Do not assume the attack is a random virus; wipers are almost always deployed intentionally by human adversaries who may still have access to the network.
- Avoid relying solely on cloud-connected backups, as advanced attackers will often attempt to locate and wipe online backups before executing the local wiper.
References & External Analysis
- Search "deleter" on VirusTotal (External Analysis)
- Search "deleter" on Any.Run (Sandbox Sandbox)
- Search "deleter" on MalwareBazaar (Malware Samples)
Frequently Asked Questions
What is Deleter and what threat category does it belong to?
Deleter is classified as a Ransomware. Documented across security telemetry, it is engineered to execute unauthorized operations, establish persistent footholds on target endpoints, and facilitate malicious campaigns targeting enterprise and individual environments.
How does Deleter establish persistence and evade defensive controls?
Deleter typically establishes persistence through registry run keys, scheduled tasks, or service installations, while evading signature-based antivirus solutions through code obfuscation, memory injection, or anti-analysis sandbox checks.
What are the essential incident response steps for mitigating a Deleter compromise?
Security teams responding to Deleter should immediately isolate affected endpoints from the network, perform memory triage to capture volatile forensic artifacts, audit registry and startup persistence mechanisms, revoke exposed user credentials, and restore systems from verified, clean backups.
What cryptographic algorithms and file targeting techniques does Deleter employ during execution?
Deleter typically leverages hybrid cryptographic architectures combining symmetric stream or block ciphers (such as AES-256 or ChaCha20) for rapid file encryption with asymmetric algorithms (such as RSA-2048 or Curve25519) to securely protect the session keys. It aggressively targets sensitive file extensions including corporate documents, databases, virtual disks, and backups while systematically executing commands to delete Volume Shadow Copies (vssadmin delete shadows /all /quiet) and disable system recovery options.
Are decryptors available for Deleter, and what is the recommended recovery procedure?
Decryption availability for Deleter depends on whether security researchers or law enforcement (such as the No More Ransom initiative) have recovered the master private keys or discovered flaws in its key generation routines. Victims should never pay the extortion demand, as payment fuels criminal operations without guaranteeing file restoration. The recommended recovery procedure entails isolating infected hosts, conducting forensic disk imaging, identifying the root access vector, and restoring validated systems from immutable offline backups.
How do I remove Deleter from Windows?
Manual removal of Deleter 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 Deleter infection?
Symptoms of Deleter 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 Deleter 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/deleter.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.