{
  "family": "activitymonitor",
  "sample_count": 3,
  "category": "trojan",
  "description": "Activitymonitor (classified in antivirus detection telemetry under designations including Trojan:Win32/Activitymonitor, Trojan.Win32.Activitymonitor, and Win32/Activitymonitor) 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, Activitymonitor 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/Activitymonitor",
    "Trojan.Win32.Activitymonitor",
    "Win32/Activitymonitor"
  ],
  "enrichment_level": "curated_sourced",
  "faq": [
    {
      "@type": "Question",
      "name": "What is Trojan:Win32/Activitymonitor?",
      "acceptedAnswer": {
        "@type": "Answer",
        "text": "Activitymonitor is a trojan threat designed to infiltrate Windows systems and execute unauthorized operations without user consent."
      }
    },
    {
      "@type": "Question",
      "name": "How does Activitymonitor 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 Activitymonitor 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 Activitymonitor 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 Activitymonitor?",
      "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": "2026-10-15",
  "mitre_attack_detail": [
    {
      "id": "T1056.001",
      "name": "Input Capture: Keylogging",
      "tactic": "Collection"
    },
    {
      "id": "T1113",
      "name": "Screen Capture",
      "tactic": "Collection"
    },
    {
      "id": "T1048.003",
      "name": "Exfiltration Over Alternative Protocol (Exfiltration via SMTP/Email)",
      "tactic": "Exfiltration"
    },
    {
      "id": "T1543.003",
      "name": "Create or Modify System Process: Windows Service",
      "tactic": "Persistence"
    }
  ],
  "containment_steps": [
    "Immediately isolate the infected endpoint from the network to halt the exfiltration of the recorded logs.",
    "Assume all credentials, emails, and sensitive documents accessed on the compromised machine have been compromised. Initiate an enterprise-wide password reset for the affected user.",
    "Preserve the system state (RAM dump) to analyze the running spyware process and locate the local staging directory where it stores its encrypted logs before exfiltration.",
    "Review firewall and proxy logs to identify the external servers used for exfiltration and block them."
  ],
  "what_to_avoid": [
    "Do not allow the user to change their passwords *from the infected machine*; the spyware will simply record the new credentials.",
    "Avoid closing the incident simply by uninstalling the software; ensure a full investigation determines exactly what data was lost and who installed the tool."
  ],
  "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/Activitymonitor",
      "url": "https://www.microsoft.com/en-us/wdsi/threats/malware-encyclopedia-description?Name=Trojan:Win32/Activitymonitor"
    },
    {
      "name": "Kaspersky Threat Intelligence - Trojan.Win32.Activitymonitor",
      "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"
  ]
}