{
  "family": "obsidium",
  "sample_count": 57,
  "category": "ransomware",
  "description": "VirTool:Win32/Obsidium is a critical heuristic detection utilized by antivirus engines to identify executables that have been heavily packed, encrypted, or obfuscated using the commercial Obsidium software protection system, a strong indicator of malware designed to evade static analysis.<br><br><b>Understanding Obsidium</b><br>For the end-user, an Obsidium alert means a highly suspicious file was blocked. For a malware analyst, an Obsidium detection is a red flag indicating a determined threat actor. While Obsidium is a legitimate commercial tool designed to protect intellectual property from reverse engineering, threat actors heavily abuse cracked or licensed versions to wrap their payloads (like ransomware, RATs, or banking trojans), effectively hiding the malicious code from signature-based antivirus engines.<br><br><b>Execution and Threat Hunting</b><br>The threat actor takes a compiled payload and wraps it in Obsidium. The resulting executable is highly entropic and densely packed. Obsidium operates by heavily encrypting the original executable code and embedding a decryption stub. When executed, the Obsidium stub runs first, employing significant anti-debugging, anti-dumping, and anti-VM techniques to ensure the environment is safe. If safe, it decrypts the malicious payload directly into memory. This makes static analysis virtually impossible. Threat hunters must recognize that an Obsidium alert means an advanced evasion technique was employed.<br><br><b>Forensic Analysis & Impact</b><br>The impact depends entirely on the hidden payload. Incident responders cannot rely on static analysis of the file on disk. EDR tools detect the execution by monitoring for behavioral anomalies once the packed payload decrypts and begins interacting with the OS. Memory forensics is absolutely required; the analyst must dump the RAM of the running process to extract the unencrypted payload, although Obsidium's robust anti-dumping features make this highly complex.",
  "cta": "Published by the SystemHelpdesk team.",
  "aliases": [],
  "enrichment_level": "expert-seo",
  "faq": [],
  "faq_count": 0,
  "mitre_attack": [
    "T1129",
    "T1055",
    "T1620",
    "T1027.002",
    "T1497.001"
  ],
  "cisa_advisory": null,
  "last_updated": "2026-06-09",
  "mitre_attack_detail": [
    {
      "id": "T1027.002",
      "name": "Obfuscated Files or Information: Software Packing",
      "tactic": "Defense Evasion"
    },
    {
      "id": "T1497.001",
      "name": "Virtualization/Sandbox Evasion: System Checks",
      "tactic": "Defense Evasion"
    },
    {
      "id": "T1620",
      "name": "Reflective Code Loading",
      "tactic": "Defense Evasion"
    },
    {
      "id": "T1055",
      "name": "Process Injection",
      "tactic": "Defense Evasion"
    },
    {
      "id": "T1129",
      "name": "Shared Modules",
      "tactic": "Execution"
    }
  ],
  "containment_steps": [
    "Isolate the endpoint immediately if the Obsidium executable was allowed to run; the highly obfuscated nature implies a severe, targeted payload.",
    "If the process is active, capture a live memory image (RAM dump) before rebooting to attempt extraction of the decrypted payload.",
    "Submit the packed binary to a specialized malware analyst for reverse engineering, noting that unpacking Obsidium is a highly specialized skill.",
    "Perform a full forensic sweep to determine how the highly obfuscated executable arrived on the endpoint."
  ],
  "what_to_avoid": [
    "Do not waste time trying to statically analyze the Obsidium executable on disk; the strong encryption will yield zero actionable intelligence.",
    "Avoid assuming the threat was fully blocked simply because AV flagged the file; the payload may have already executed in memory."
  ],
  "target_industries": [
    "Global / Opportunistic"
  ],
  "motivation": "Opportunistic",
  "threat_actors": [
    "Unknown / Cybercriminal"
  ],
  "target_geographies": [
    "Global"
  ]
}