{
  "family": "deleter",
  "sample_count": 3,
  "category": "ransomware",
  "description": "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.<br><br><b>Understanding Deleter (Data Wiper)</b><br>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.<br><br><b>Execution and Destructive Mechanics</b><br>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`).<br><br><b>Indicators of Compromise & Impact</b><br>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.",
  "cta": "Published by the SystemHelpdesk team.",
  "aliases": [],
  "enrichment_level": "expert-seo",
  "faq": [
    {
      "@type": "Question",
      "name": "What is Deleter and what threat category does it belong to?",
      "acceptedAnswer": {
        "@type": "Answer",
        "text": "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."
      }
    },
    {
      "@type": "Question",
      "name": "How does Deleter establish persistence and evade defensive controls?",
      "acceptedAnswer": {
        "@type": "Answer",
        "text": "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."
      }
    },
    {
      "@type": "Question",
      "name": "What are the essential incident response steps for mitigating a Deleter compromise?",
      "acceptedAnswer": {
        "@type": "Answer",
        "text": "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."
      }
    },
    {
      "@type": "Question",
      "name": "What cryptographic algorithms and file targeting techniques does Deleter employ during execution?",
      "acceptedAnswer": {
        "@type": "Answer",
        "text": "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."
      }
    },
    {
      "@type": "Question",
      "name": "Are decryptors available for Deleter, and what is the recommended recovery procedure?",
      "acceptedAnswer": {
        "@type": "Answer",
        "text": "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."
      }
    }
  ],
  "faq_count": 5,
  "mitre_attack": [
    "T1561.001",
    "T1490",
    "T1485",
    "T1070.001",
    "T1561.002"
  ],
  "cisa_advisory": null,
  "last_updated": "2026-06-09",
  "mitre_attack_detail": [
    {
      "id": "T1485",
      "name": "Data Destruction",
      "tactic": "Impact"
    },
    {
      "id": "T1561.001",
      "name": "Disk Wipe: Disk Content Wipe",
      "tactic": "Impact"
    },
    {
      "id": "T1561.002",
      "name": "Disk Wipe: Disk Structure Wipe (MBR Overwrite)",
      "tactic": "Impact"
    },
    {
      "id": "T1490",
      "name": "Inhibit System Recovery",
      "tactic": "Impact"
    },
    {
      "id": "T1070.001",
      "name": "Indicator Removal on Host: Clear Windows Event Logs",
      "tactic": "Defense Evasion"
    }
  ],
  "containment_steps": [
    "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": [
    "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."
  ],
  "target_industries": [
    "Healthcare",
    "Critical Infrastructure",
    "Enterprise"
  ],
  "motivation": "Financial Extortion",
  "threat_actors": [
    "Unknown / Cybercriminal"
  ],
  "target_geographies": [
    "Global"
  ],
  "attack_stage": [
    "defense_evasion",
    "impact"
  ],
  "ecosystem": [
    "windows_pe"
  ],
  "is_emerging": false,
  "target_platforms": [
    "Windows 11",
    "Windows 10",
    "Windows Server 2022",
    "Windows Server 2019"
  ]
}