{
  "family": "omyaamfbexii",
  "sample_count": 1,
  "category": "ransomware",
  "description": "<h3>Executive Summary</h3>\n\"Omyaamfbexii\" is a generic detection identifier rather than a distinct, named malware family. It is typically generated automatically by antivirus engines—often via machine learning or heuristic analysis—to flag highly obfuscated executables or domains generated by a Domain Generation Algorithm (DGA) that exhibit malicious characteristics.\n\n<h3>Behavioral Analysis and Heuristic Triggers</h3>\nThe seemingly random string \"omyaamfbexii\" is characteristic of automated naming conventions used by security vendors when a file matches a behavioral profile of a trojan, but lacks a specific signature tying it to a known family (like Emotet or Trickbot). \n\nFiles flagged with this identifier frequently exhibit the following behaviors during dynamic analysis (sandboxing):\n<ul>\n<li><strong>Heavy Obfuscation:</strong> The executable is often packed using custom or commercial packers (e.g., UPX, Themida) to thwart static analysis and reverse engineering.</li>\n<li><strong>DGA Communications:</strong> The malware may attempt to resolve domain names consisting of pseudo-random character strings, indicating the use of a Domain Generation Algorithm to locate its command-and-control (C2) server.</li>\n<li><strong>Process Injection:</strong> It frequently attempts to inject malicious code into legitimate system processes (`explorer.exe`, `svchost.exe`) to hide its execution and bypass local firewalls.</li>\n</ul>\n\n<h3>Security Implications</h3>\nWhile a generic detection might seem less threatening than a named APT group, it often indicates the presence of a novel, zero-day threat, or a heavily mutated variant of existing malware. These files are typically downloaders or initial access trojans designed to pave the way for ransomware deployments.\n\n<h3>Investigation and Remediation</h3>\n<ul>\n<li><strong>File Isolation and Analysis:</strong> Immediately isolate the endpoint where the file was detected. Submit the flagged executable to an advanced malware sandbox or a malware analysis team to determine its true capabilities.</li>\n<li><strong>Network Forensics:</strong> Analyze network logs for DNS queries matching random strings, which may indicate successful DGA communication and provide IOCs (Indicators of Compromise) for blocking.</li>\n<li><strong>Comprehensive Sweeps:</strong> Utilize the IOCs gathered from dynamic analysis to sweep the entire enterprise network for lateral movement or secondary infections.</li>\n</ul>",
  "cta": "Published by the SystemHelpdesk team.",
  "aliases": [
    "Generic.Omyaamfbexii",
    "Trojan.Generic",
    "DGA.Generic"
  ],
  "enrichment_level": "expert-seo",
  "faq": [
    {
      "@type": "Question",
      "name": "What is Omyaamfbexii and what threat category does it belong to?",
      "acceptedAnswer": {
        "@type": "Answer",
        "text": "Omyaamfbexii 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 Omyaamfbexii establish persistence and evade defensive controls?",
      "acceptedAnswer": {
        "@type": "Answer",
        "text": "Omyaamfbexii 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 Omyaamfbexii compromise?",
      "acceptedAnswer": {
        "@type": "Answer",
        "text": "Security teams responding to Omyaamfbexii 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 Generic.Omyaamfbexii employ during execution?",
      "acceptedAnswer": {
        "@type": "Answer",
        "text": "Generic.Omyaamfbexii 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 Generic.Omyaamfbexii, and what is the recommended recovery procedure?",
      "acceptedAnswer": {
        "@type": "Answer",
        "text": "Decryption availability for Generic.Omyaamfbexii 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": [
    "T1059",
    "T1568.002",
    "T1027"
  ],
  "cisa_advisory": null,
  "last_updated": "2026-10-15",
  "type": "Trojan",
  "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": "T1059",
      "name": "Command and Scripting Interpreter",
      "tactic": "Execution"
    },
    {
      "id": "T1568.002",
      "name": "Dynamic Resolution: Domain Generation Algorithms (DGA) (Evading C2 blacklisting)",
      "tactic": "Command and Control"
    },
    {
      "id": "T1027",
      "name": "Obfuscated Files or Information",
      "tactic": "Defense Evasion"
    }
  ],
  "containment_steps": [
    "Immediately isolate affected host(s) from the internal network (disconnect physical Ethernet and disable Wi-Fi/Bluetooth) to prevent Omyaamfbexii 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 Omyaamfbexii 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 Omyaamfbexii 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 Omyaamfbexii 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 Omyaamfbexii.",
    "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 Omyaamfbexii eradication is completely verified."
  ],
  "target_platforms": [
    "Windows 11",
    "Windows 10",
    "Windows Server 2022",
    "Windows Server 2019"
  ]
}