{
  "family": "murka",
  "sample_count": 1,
  "category": "ransomware",
  "description": "<h3>Executive Summary</h3>\nMurka is a highly evasive Trojan designed to establish a covert backdoor on compromised Windows systems. While occasionally acting as a standalone remote access tool (RAT), its primary utility for modern threat actors is as a reliable initial access broker, facilitating the silent download and deployment of secondary payloads such as ransomware and advanced information stealers.\n\n<h3>Infection Vectors and Execution</h3>\nMurka is predominantly distributed via sophisticated spear-phishing campaigns. These emails often contain weaponized Microsoft Office documents utilizing malicious macros, or exploit kits that trigger drive-by downloads when a user visits a compromised website.\n\nOnce executed, Murka prioritizes establishing a deep, persistent foothold:\n<ul>\n<li><strong>Defense Evasion:</strong> Murka employs advanced process hollowing techniques, injecting its malicious code into legitimate, whitelisted Windows processes (e.g., `svchost.exe` or `explorer.exe`) to bypass process-based firewall rules and hide from the Task Manager.</li>\n<li><strong>Persistence:</strong> It ensures operational continuity by aggressively modifying the Windows Registry (creating keys in `HKLM\\SOFTWARE\\Microsoft\\Windows\\CurrentVersion\\Run`) or by installing itself as a hidden system service.</li>\n<li><strong>C2 Communication:</strong> Murka establishes a covert communication channel with its command-and-control (C2) infrastructure, often utilizing encrypted HTTP/S traffic to blend in with normal web browsing.</li>\n</ul>\n\n<h3>Security and Risk Implications</h3>\nA Murka infection indicates a critical breach of the endpoint perimeter. Because it provides remote attackers with an interactive shell and the ability to download arbitrary executables, a single Murka infection can rapidly escalate into a catastrophic, enterprise-wide ransomware deployment.\n\n<h3>Eradication and Incident Response</h3>\n<ul>\n<li><strong>Endpoint Detection and Response (EDR):</strong> Utilize EDR to monitor for anomalous parent-child process trees, specifically focusing on standard office applications spawning command shells (`cmd.exe`) or PowerShell.</li>\n<li><strong>Network Isolation:</strong> Instantly isolate the infected machine from the corporate network to sever the C2 connection and halt the download of secondary payloads.</li>\n<li><strong>Forensic Sweeps:</strong> A standard antivirus scan is insufficient. Responders must conduct a deep forensic sweep to locate the specific persistence mechanisms and identify any secondary payloads Murka successfully dropped.</li>\n</ul>",
  "cta": "Published by the SystemHelpdesk team.",
  "aliases": [
    "Trojan.Murka",
    "Backdoor.Murka",
    "Win32/Murka"
  ],
  "enrichment_level": "insufficient_information",
  "faq": [],
  "faq_count": 0,
  "mitre_attack": [
    "T1055.012",
    "T1105",
    "T1547.001",
    "T1059"
  ],
  "cisa_advisory": null,
  "last_updated": "2026-07-01T16:25:49Z",
  "type": "Trojan",
  "target_industries": [
    "Global / Opportunistic"
  ],
  "motivation": "Opportunistic",
  "threat_actors": [
    "Unknown / Cybercriminal"
  ],
  "target_geographies": [
    "Global"
  ]
}