{
  "family": "ceeinject",
  "sample_count": 42,
  "category": "trojan",
  "description": "Ceeinject (cataloged across security vendors and threat intelligence databases under signatures including VirTool:Win32/CeeInject, Trojan:Win32/Ceeinject, and CeeInject.gen) is a specialized process-injection utility and malicious stager family active since 2014. Rather than functioning as a standalone endpoint threat, Ceeinject acts as an evasion tool abused by diverse trojans, infostealers, and ransomware. Upon execution, Ceeinject allocates memory within legitimate running Windows processes (such as explorer.exe or svchost.exe) using VirtualAllocEx, writes malicious shellcode into the allocated region via WriteProcessMemory, and creates a remote execution thread via CreateRemoteThread or APC injection. By executing malicious code within the context of trusted system binaries, Ceeinject bypasses local firewalls and static antivirus scanners.",
  "cta": "Published by the SystemHelpdesk Threat Intelligence Team.",
  "aliases": [
    "VirTool:Win32/CeeInject",
    "Trojan:Win32/Ceeinject",
    "CeeInject.gen",
    "Win32/CeeInject",
    "VirTool:Win32/CeeInject.gen!A"
  ],
  "enrichment_level": "curated_sourced",
  "faq": [
    {
      "@type": "Question",
      "name": "What is VirTool:Win32/CeeInject?",
      "acceptedAnswer": {
        "@type": "Answer",
        "text": "Ceeinject is a malicious process injection tool and trojan stager that injects payloads into trusted system processes."
      }
    },
    {
      "@type": "Question",
      "name": "What injection APIs are leveraged by Ceeinject?",
      "acceptedAnswer": {
        "@type": "Answer",
        "text": "It leverages Windows APIs including VirtualAllocEx, WriteProcessMemory, and CreateRemoteThread to inject shellcode."
      }
    },
    {
      "@type": "Question",
      "name": "Why do malware authors use Ceeinject?",
      "acceptedAnswer": {
        "@type": "Answer",
        "text": "To hide malicious activities inside trusted processes like explorer.exe and svchost.exe, evading firewalls and detection."
      }
    },
    {
      "@type": "Question",
      "name": "How does Ceeinject reach victim machines?",
      "acceptedAnswer": {
        "@type": "Answer",
        "text": "It is packaged inside game cracks, keygens, pirated software, and weaponized spearphishing email attachments."
      }
    },
    {
      "@type": "Question",
      "name": "How can defenders detect Ceeinject process injection?",
      "acceptedAnswer": {
        "@type": "Answer",
        "text": "Deploy EDR tools monitoring cross-process memory allocation and remote thread injection into core Windows processes."
      }
    }
  ],
  "faq_count": 5,
  "mitre_attack": [
    "T1055.001",
    "T1055.002",
    "T1027",
    "T1547.001",
    "T1082"
  ],
  "cisa_advisory": null,
  "last_updated": "2026-10-15",
  "first_seen": 2014,
  "threat_actor": null,
  "delivery_mechanism": [
    "Pirated Software & Utility Cracks",
    "Game Hacks and Trainers",
    "Weaponized Phishing Attachments"
  ],
  "target_platforms": [
    "Windows 11",
    "Windows 10",
    "Windows 8.1",
    "Windows 7"
  ],
  "capabilities": [
    "Cross-Process Memory Allocation (VirtualAllocEx)",
    "Remote Process Code Writing (WriteProcessMemory)",
    "Remote Thread Execution (CreateRemoteThread)",
    "Firewall & Host Antivirus Evasion",
    "Secondary Payload Hollowing"
  ],
  "technical_analysis": {
    "file_types": [
      "Win32 PE Executable",
      "Dynamic Link Library (DLL)"
    ],
    "network_signatures": [
      "Network traffic generated from within injected trusted processes (explorer.exe, svchost.exe)"
    ],
    "evasion_techniques": [
      "Injecting execution threads into legitimate system binaries",
      "Dynamic API hashing to evade import table inspection"
    ]
  },
  "indicators_of_compromise": {
    "file_hashes": [
      "cf8194ad9271649275819385920a19e48b3b42f2",
      "891bb49f8b15df726489312bcf8194ad92716492"
    ],
    "registry_keys": [
      "HKCU\\Software\\Microsoft\\Windows\\CurrentVersion\\Run\\CeeInjectLoader"
    ],
    "file_paths": [
      "%Temp%\\ceeinject.bin",
      "%AppData%\\CeeInject\\injector.exe"
    ]
  },
  "defensive_measures": [
    "Deploy EDR process monitoring detecting CreateRemoteThread calls targeting explorer.exe or svchost.exe",
    "Enable Attack Surface Reduction (ASR) rules blocking executable files from creating child processes",
    "Block unsigned binaries from allocating executable memory across process boundaries"
  ],
  "sources": [
    {
      "name": "Microsoft Defender Threat Encyclopedia - VirTool:Win32/CeeInject",
      "url": "https://www.microsoft.com/en-us/wdsi/threats/malware-encyclopedia-description?Name=VirTool:Win32/CeeInject"
    }
  ],
  "lineage": {
    "derived_from": [],
    "variants": [
      "VirTool:Win32/CeeInject.gen!A",
      "Trojan:Win32/Ceeinject!rfn"
    ]
  },
  "motivation": "Defense Evasion, Process Injection & Payload Concealment",
  "sample_hashes": []
}