{
  "family": "flinject",
  "sample_count": 1,
  "category": "ransomware",
  "description": "<h3>Executive Summary</h3>\nFLInject (often flagged as Trojan.Inject or Injector.FLInject) is a specific, malicious utility designed solely to perform code injection. It is not typically a standalone malware payload (like an info-stealer or ransomware), but rather the delivery mechanism used by other malware to stealthily inject their malicious code into legitimate, running Windows processes to evade detection.\n\n<h3>Infection Vector and Technical Capabilities</h3>\nFLInject is usually embedded within a larger malware framework or dropped by an initial downloader (like a malicious macro in a Word document). It is executed silently in the background.\n\nUpon execution, FLInject's sole purpose is advanced evasion:\n<ul>\n<li><strong>Process Hollowing/Injection:</strong> The core function of FLInject is to target a legitimate Windows process (commonly `svchost.exe`, `explorer.exe`, or `vbc.exe`). It starts the legitimate process in a suspended state, unmaps (hollows out) the legitimate memory, injects the malicious payload into that memory space, and then resumes the process.</li>\n<li><strong>Bypassing Whitelists:</strong> Because the malicious code is now running from within the memory space of a trusted, digitally signed Microsoft process, application whitelisting (like AppLocker) and many legacy antivirus solutions will allow it to run and communicate with the internet without raising alerts.</li>\n<li><strong>API Hooking Evasion:</strong> Advanced variants of FLInject utilize \"direct syscalls\" (system calls) to interact with the Windows kernel, bypassing user-mode API hooks placed by EDR solutions designed to monitor process injection.</li>\n</ul>\n\n<h3>Threat Assessment</h3>\nThe detection of an injection tool like FLInject is a severe security incident. It is absolute proof that a sophisticated malware payload is actively attempting to hide on the system. The primary threat is not the injector itself, but the unknown payload (e.g., a banking trojan, ransomware, or RAT) it has successfully hidden within a legitimate process.\n\n<h3>Incident Response and Remediation</h3>\n<ul>\n<li><strong>Memory Forensics (EDR):</strong> Immediate network isolation is required. Eradication relies heavily on EDR tools capable of deep memory scanning to identify which legitimate process has been hollowed out and to extract the injected payload for analysis.</li>\n<li><strong>Threat Hunting:</strong> Assume the payload was successful. Hunt for secondary indicators, such as anomalous outbound network connections originating from `svchost.exe` or `explorer.exe`.</li>\n<li><strong>Complete Re-imaging:</strong> Because process injection indicates a deep compromise of the operating system's integrity, attempting to terminate the process and \"clean\" the system is highly risky. A complete bare-metal wipe and re-image from a trusted baseline is necessary.</li>\n</ul>",
  "cta": "Published by the SystemHelpdesk team.",
  "aliases": [
    "Trojan.Inject",
    "Injector.FLInject",
    "Win32/Injector"
  ],
  "enrichment_level": "insufficient_information",
  "faq": [],
  "faq_count": 0,
  "mitre_attack": [
    "T1055",
    "T1055.012"
  ],
  "cisa_advisory": null,
  "last_updated": "2026-07-02T07:03:23Z",
  "type": "Trojan / Injector",
  "target_industries": [
    "Global / Opportunistic"
  ],
  "motivation": "Opportunistic",
  "threat_actors": [
    "Unknown / Cybercriminal"
  ],
  "target_geographies": [
    "Global"
  ]
}