{
  "family": "bobax",
  "sample_count": 5,
  "category": "trojan",
  "description": "Bobax (classified in antivirus detection telemetry under designations including Trojan:Win32/Bobax, Trojan.Win32.Bobax, and Win32/Bobax) is a multi-stage trojan engineered to disguise itself as legitimate software, execute unauthorized commands, and coordinate with external command-and-control infrastructure. Disseminated across enterprise networks and consumer workstations via social engineering, phishing attachments, malicious drive-by downloads, or weaponized software cracks, Bobax executes an initial reconnaissance phase upon system ingress. The binary evaluates host privileges, detects active hypervisors and sandbox environments to evade behavioral analysis, and establishes resilient autostart persistence by configuring registry keys under HKCU\\Software\\Microsoft\\Windows\\CurrentVersion\\Run or registering background Windows services. Operational mechanics characteristic of this family include deceptive executable masquerading, registry run key autostart, system telemetry gathering, and remote C2 beaconing. Outbound communication is established with remote threat actor infrastructure to beacon operational status and receive tasking, posing significant security risks to data integrity and host availability.",
  "cta": "Published by the SystemHelpdesk Threat Intelligence Team.",
  "aliases": [
    "Trojan:Win32/Bobax",
    "Trojan.Win32.Bobax",
    "Win32/Bobax"
  ],
  "enrichment_level": "curated_sourced",
  "faq": [
    {
      "@type": "Question",
      "name": "What is Trojan:Win32/Bobax?",
      "acceptedAnswer": {
        "@type": "Answer",
        "text": "Bobax is a trojan threat designed to infiltrate Windows systems and execute unauthorized operations without user consent."
      }
    },
    {
      "@type": "Question",
      "name": "How does Bobax compromise target systems?",
      "acceptedAnswer": {
        "@type": "Answer",
        "text": "It commonly infiltrates systems via phishing emails, trojanized software installers, exploit kits, or unpatched vulnerabilities."
      }
    },
    {
      "@type": "Question",
      "name": "What persistence mechanisms does Bobax utilize?",
      "acceptedAnswer": {
        "@type": "Answer",
        "text": "It typically creates autostart entries in the Windows Registry (HKCU/HKLM Run keys), registers scheduled tasks, or installs hidden background services."
      }
    },
    {
      "@type": "Question",
      "name": "What risks does Bobax pose to an enterprise?",
      "acceptedAnswer": {
        "@type": "Answer",
        "text": "It can lead to credential theft, system manipulation, unauthorized remote access, data loss, or secondary malware delivery."
      }
    },
    {
      "@type": "Question",
      "name": "How can administrators detect and eliminate Bobax?",
      "acceptedAnswer": {
        "@type": "Answer",
        "text": "Deploy modern EDR solutions with updated behavioral signatures, isolate infected endpoints, audit autostart persistence entries, and conduct full antimalware scans."
      }
    }
  ],
  "faq_count": 5,
  "mitre_attack": [
    "T1059.003",
    "T1027",
    "T1547.001",
    "T1071.001",
    "T1105"
  ],
  "cisa_advisory": null,
  "last_updated": "2026-10-16",
  "mitre_attack_detail": [
    {
      "id": "T1210",
      "name": "Exploitation of Remote Services (MS04-011 / MS03-026)",
      "tactic": "Lateral Movement"
    },
    {
      "id": "T1498.002",
      "name": "Network Denial of Service: Reflection Amplification (Used for Spam/DDoS)",
      "tactic": "Impact"
    },
    {
      "id": "T1055",
      "name": "Process Injection (Hiding in svchost.exe)",
      "tactic": "Defense Evasion"
    },
    {
      "id": "T1543.003",
      "name": "Create or Modify System Process: Windows Service",
      "tactic": "Persistence"
    }
  ],
  "containment_steps": [
    "Immediately isolate the infected endpoint from the network to stop the outbound spam flood and prevent the IP from being blacklisted.",
    "Block outbound port 25 (SMTP) traffic from all endpoints at the perimeter firewall, allowing only the designated corporate email servers to send mail.",
    "Ensure all legacy Windows systems are patched against MS04-011 and MS03-026, or decommissioned entirely.",
    "Monitor IP reputation services (like MXToolbox) to ensure the organization's public IP has not been blacklisted due to the Bobax activity."
  ],
  "what_to_avoid": [
    "Do not allow standard workstations direct outbound access to the internet on port 25; this is the primary enabler for spam botnets.",
    "Avoid relying solely on local AV scans, as worms like Bobax heavily utilize process injection to hide from standard file-based detection."
  ],
  "target_industries": [
    "Global / Opportunistic"
  ],
  "motivation": "Opportunistic",
  "threat_actors": [
    "Unknown / Cybercriminal"
  ],
  "target_geographies": [
    "Global"
  ],
  "attack_stage": [
    "execution",
    "persistence"
  ],
  "ecosystem": [
    "windows_pe"
  ],
  "is_emerging": false,
  "sources": [
    {
      "name": "Microsoft Defender Threat Encyclopedia - Trojan:Win32/Bobax",
      "url": "https://www.microsoft.com/en-us/wdsi/threats/malware-encyclopedia-description?Name=Trojan:Win32/Bobax"
    },
    {
      "name": "Kaspersky Threat Intelligence - Trojan.Win32.Bobax",
      "url": "https://threats.kaspersky.com/en/threat/"
    },
    {
      "name": "MITRE ATT&CK - Enterprise Techniques",
      "url": "https://attack.mitre.org/techniques/T1059.003/"
    }
  ],
  "target_platforms": [
    "Windows 11",
    "Windows 10",
    "Windows 7"
  ]
}