{
  "family": "golem",
  "sample_count": 1,
  "category": "ransomware",
  "description": "<h3>Executive Summary</h3>\nGolem is a sophisticated malicious Trojan and rootkit designed to covertly infiltrate Windows systems, establish deep persistence, and recruit the compromised endpoint into a botnet. Historically, \"Golem\" variants have been utilized by advanced threat actors to facilitate massive Distributed Denial of Service (DDoS) attacks, relay spam, or serve as a persistent backdoor for secondary payload delivery.\n\n<h3>Infection Vector and Technical Capabilities</h3>\nGolem is typically distributed via exploit kits that silently compromise vulnerable web browsers, through massive spear-phishing campaigns, or by brute-forcing weak RDP (Remote Desktop Protocol) credentials.\n\nOnce executed, Golem focuses on stealth and network control:\n<ul>\n<li><strong>Kernel-Level Rootkit:</strong> Advanced variants of Golem utilize kernel-mode drivers (rootkits) to intercept API calls. This allows the malware to completely hide its processes, files, and registry entries from the Windows Task Manager and traditional, user-mode antivirus scanners.</li>\n<li><strong>Botnet Recruitment:</strong> The primary function is to connect the endpoint to a centralized Command and Control (C2) server. The machine then quietly awaits instructions, allowing the attacker to utilize the collective processing power and bandwidth of thousands of infected machines simultaneously.</li>\n<li><strong>Secondary Payloads:</strong> Because Golem establishes a highly secure, hidden backdoor, the botnet operators frequently lease access to the infected machines to other criminal groups, who then utilize the Golem backdoor to deploy ransomware or info-stealers.</li>\n</ul>\n\n<h3>Threat Assessment</h3>\nA Golem detection is a critical security incident. The presence of a rootkit implies that the operating system itself can no longer be trusted to accurately report its own state. The endpoint is actively contributing to malicious activity on the internet and is highly vulnerable to the deployment of secondary, destructive payloads.\n\n<h3>Incident Response and Remediation</h3>\n<ul>\n<li><strong>Immediate Network Isolation:</strong> The highest priority is to sever the connection to the C2 server by instantly isolating the infected endpoint from the LAN and the internet.</li>\n<li><strong>Memory Forensics and Offline Scanning:</strong> Because the rootkit hides the malware from the running OS, analysis and detection often require memory forensics (e.g., Volatility) or booting the machine from an offline, trusted OS (like a Linux Live USB) to scan the dormant hard drive.</li>\n<li><strong>Complete Re-imaging:</strong> Due to the kernel-level hooks established by the rootkit, attempting to \"clean\" the system is highly unreliable. The endpoint must undergo a complete bare-metal wipe and re-image from a trusted baseline.</li>\n</ul>",
  "cta": "Published by the SystemHelpdesk team.",
  "aliases": [
    "Trojan.Golem",
    "Rootkit.Golem",
    "Botnet.Golem",
    "Win32/Golem"
  ],
  "enrichment_level": "expert-seo",
  "faq": [
    {
      "@type": "Question",
      "name": "What is Golem and what threat category does it belong to?",
      "acceptedAnswer": {
        "@type": "Answer",
        "text": "Golem 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 Golem establish persistence and evade defensive controls?",
      "acceptedAnswer": {
        "@type": "Answer",
        "text": "Golem 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 Golem compromise?",
      "acceptedAnswer": {
        "@type": "Answer",
        "text": "Security teams responding to Golem 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 Trojan.Golem employ during execution?",
      "acceptedAnswer": {
        "@type": "Answer",
        "text": "Trojan.Golem 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 Trojan.Golem, and what is the recommended recovery procedure?",
      "acceptedAnswer": {
        "@type": "Answer",
        "text": "Decryption availability for Trojan.Golem 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": [
    "T1014",
    "T1055",
    "T1543.003"
  ],
  "cisa_advisory": null,
  "last_updated": "2026-10-15",
  "type": "Trojan / Rootkit / Botnet",
  "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,
  "mitre_attack_detail": [
    {
      "id": "T1014",
      "name": "Rootkit (Hiding files and processes)",
      "tactic": "Defense Evasion"
    },
    {
      "id": "T1055",
      "name": "Process Injection",
      "tactic": "Defense Evasion"
    },
    {
      "id": "T1543.003",
      "name": "Create or Modify System Process: Windows Service",
      "tactic": "Persistence"
    }
  ],
  "containment_steps": [
    "Immediately isolate affected host(s) from the internal network (disconnect physical Ethernet and disable Wi-Fi/Bluetooth) to prevent Golem from spreading laterally or encrypting network-attached storage (NAS) and shared SMB volumes.",
    "Preserve volatile system memory (RAM capture) on a representative endpoint before attempting a reboot or power-down, as Golem symmetric encryption keys or uncompiled payload components may still reside in memory.",
    "Audit process execution logs and terminate active scripting interpreters (e.g. PowerShell, CMD, WScript) or commands executing 'vssadmin.exe delete shadows' or 'wbadmin' used by Golem to inhibit recovery.",
    "Investigate the initial compromise vector (such as exposed RDP instances, spearphishing attachments, or vulnerable edge gateways) and enforce an immediate credential reset for all compromised Active Directory accounts.",
    "Restore critical assets and databases exclusively from verified, air-gapped, or immutable offline backups once the Golem binary and related persistence hooks are eradicated."
  ],
  "what_to_avoid": [
    "Do not restart or power cycle infected systems prematurely; doing so destroys volatile RAM encryption keys and may trigger bootloader locking logic embedded in Golem.",
    "Avoid negotiating or paying the extortion demand without prior forensic evaluation and consultation with incident response specialists, as payment does not guarantee data recovery.",
    "Do not connect clean backup drives or external storage to the affected network until Golem eradication is completely verified."
  ],
  "target_platforms": [
    "Windows 11",
    "Windows 10",
    "Windows Server 2022",
    "Windows Server 2019"
  ]
}