{
  "family": "hyperbro",
  "sample_count": 1,
  "category": "trojan",
  "description": "<h3>Executive Summary</h3>\nHyperBro is a custom, in-memory Remote Access Trojan (RAT) and backdoor exclusively utilized by the Chinese state-sponsored threat group APT27 (also known as Emissary Panda, Iron Tiger, or LuckyMouse). It is a highly sophisticated espionage tool designed to provide the attackers with long-term, stealthy, and unrestricted administrative access to compromised enterprise and government networks for the purpose of intellectual property theft and surveillance.\n\n<h3>Infection Vector and Technical Capabilities</h3>\nAPT27 typically deploys HyperBro as a secondary payload after gaining initial access through the exploitation of public-facing server vulnerabilities (e.g., SharePoint, Exchange) or via targeted spear-phishing with malicious documents.\n\nOnce deployed, HyperBro exhibits advanced APT capabilities:\n<ul>\n<li><strong>In-Memory Execution (Fileless):</strong> HyperBro is designed to operate almost entirely in memory. It is often loaded using DLL side-loading techniques (hijacking legitimate, signed executables to load the malicious payload) or via reflective DLL injection, making it highly resistant to traditional on-disk antivirus scanning.</li>\n<li><strong>Custom C2 Protocols:</strong> It utilizes custom, encrypted communication protocols over HTTP/HTTPS to communicate with its Command and Control servers, often blending its traffic with legitimate network noise to evade perimeter detection.</li>\n<li><strong>Comprehensive Backdoor Capabilities:</strong> HyperBro grants the attacker total control. It can execute arbitrary shell commands, manage files (upload/download/delete), manipulate the Windows registry, log keystrokes, capture screenshots, and act as a proxy to pivot laterally deeper into the network.</li>\n</ul>\n\n<h3>Threat Assessment</h3>\nA HyperBro detection is an absolute critical security incident (Code Red). It signifies an active, deep compromise by a highly resourced, Tier-1 state-sponsored adversary. The objective is stealthy, long-term espionage. If HyperBro is detected, it must be assumed that the attackers have already achieved broad lateral movement and likely possess Domain Admin credentials.\n\n<h3>Incident Response and Remediation</h3>\n<ul>\n<li><strong>Invoke Incident Response Retainer:</strong> A confirmed APT27 breach requires immediate escalation to specialized, external Incident Response (IR) teams and potentially national cyber security authorities.</li>\n<li><strong>Containment Strategy:</strong> Do not immediately remediate individual endpoints, as this will alert the adversary, causing them to \"dig in\" using alternative backdoors. Containment must be a coordinated, network-wide event to sever all access simultaneously.</li>\n<li><strong>Total Infrastructure Rebuild:</strong> Eradicating an APT requires fundamentally rebuilding compromised infrastructure, enforcing strict network segmentation, and implementing pervasive MFA, as the adversary likely possesses global administrative credentials.</li>\n</ul>",
  "cta": "Published by the SystemHelpdesk team.",
  "aliases": [
    "APT.HyperBro",
    "Backdoor.HyperBro",
    "Win32/HyperBro",
    "APT27.Payload"
  ],
  "enrichment_level": "insufficient_information",
  "faq": [],
  "faq_count": 0,
  "mitre_attack": [
    "T1574.002",
    "T1055.001",
    "T1071.001",
    "T1056.001"
  ],
  "cisa_advisory": null,
  "last_updated": "2026-07-02T07:18:19Z",
  "type": "APT Backdoor",
  "target_industries": [
    "Global / Opportunistic"
  ],
  "motivation": "Opportunistic",
  "threat_actors": [
    "Unknown / Cybercriminal"
  ],
  "target_geographies": [
    "Global"
  ]
}