{
  "family": "installmate",
  "sample_count": 3,
  "category": "trojan",
  "description": "Adware:Win32/Installmate is a detection for a potentially malicious software packager or bundler. InstallMate itself (formerly Tarma InstallMate) is a legitimate software installation builder for Windows. However, much like Nullsoft (NSIS) or InnoSetup, the InstallMate engine is frequently abused by adware networks and malware authors to silently bundle unwanted programs, browser hijackers, and trojans alongside legitimate freeware (`T1189`).<br><br><b>Understanding Installmate (Software Bundlers)</b><br>To an end-user, executing an Installmate-packaged file looks like a standard software setup wizard. For a security analyst, a heuristic detection for Installmate implies that the package contains hidden payloads designed to install silently (`T1204.002`). The business model relies on Pay-Per-Install (PPI) networks, where the distributor gets paid for every extra toolbar or adware application they successfully sneak onto the victim's machine.<br><br><b>Execution and Bundling Mechanics</b><br>When the user runs the installer, the legitimate setup UI may present complex or deliberately confusing 'Custom Install' options. If the user clicks 'Next' without reading carefully, the Installmate package silently executes secondary installers in the background (`T1105`). These secondary payloads establish persistence (`T1547.001`), modify browser settings (`T1112`), and inject advertisements. Furthermore, advanced malware operators use these legitimate installer engines to bypass basic antivirus heuristics, as the outer wrapper is a known, digitally signed installation engine, hiding the malicious binaries encrypted within the installation archive (`T1027.002`).<br><br><b>Indicators of Compromise & Impact</b><br>The impact ranges from extreme annoyance (adware) to full system compromise (if the bundler drops a trojan). Host-based IoCs include EDR alerts for a single setup executable spawning multiple unrelated child processes (`msiexec.exe`, `cmd.exe`, or unknown binaries in `%Temp%`), sudden modifications to browser shortcut properties, and the appearance of unrequested desktop icons. Network IoCs include the installer reaching out to affiliate networks to register a successful installation and download the secondary payloads.",
  "cta": "Published by the SystemHelpdesk team.",
  "aliases": [],
  "enrichment_level": "expert-seo",
  "faq": [
    {
      "@type": "Question",
      "name": "What is Installmate and what threat category does it belong to?",
      "acceptedAnswer": {
        "@type": "Answer",
        "text": "Installmate is classified as a Trojan. 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 Installmate establish persistence and evade defensive controls?",
      "acceptedAnswer": {
        "@type": "Answer",
        "text": "Installmate 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 Installmate compromise?",
      "acceptedAnswer": {
        "@type": "Answer",
        "text": "Security teams responding to Installmate 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 secondary payloads and staging behaviors are commonly associated with Installmate?",
      "acceptedAnswer": {
        "@type": "Answer",
        "text": "Installmate frequently operates as a loader or dropper designed to establish a foothold before downloading and executing secondary high-impact malware payloads. Depending on the threat actor's objectives, these dropped modules can range from ransomware and banking injects to modular infostealers and remote management backdoors."
      }
    },
    {
      "@type": "Question",
      "name": "How can security operations teams effectively detect and hunt for Installmate across enterprise endpoints?",
      "acceptedAnswer": {
        "@type": "Answer",
        "text": "Defenders should hunt for Installmate by deploying behavioral endpoint detection and response (EDR) rules that monitor suspicious process spawning (such as cmd.exe or powershell.exe spawned from office documents or temporary directories), anomalous outbound network connections from non-browser binaries, and unauthorized modifications to Windows Run keys and scheduled task registries."
      }
    }
  ],
  "faq_count": 5,
  "mitre_attack": [
    "T1105",
    "T1204.002",
    "T1189",
    "T1027.002"
  ],
  "cisa_advisory": null,
  "last_updated": "2026-06-09",
  "mitre_attack_detail": [
    {
      "id": "T1189",
      "name": "Drive-by Compromise (Bundled installations)",
      "tactic": "Initial Access"
    },
    {
      "id": "T1027.002",
      "name": "Obfuscated Files or Information: Software Packing",
      "tactic": "Defense Evasion"
    },
    {
      "id": "T1204.002",
      "name": "User Execution: Malicious File",
      "tactic": "Execution"
    },
    {
      "id": "T1105",
      "name": "Ingress Tool Transfer (Downloading bundled payloads)",
      "tactic": "Command and Control"
    }
  ],
  "containment_steps": [
    "Use Task Manager to terminate the installation process if it is still running, along with any suspicious child processes it spawned.",
    "Use the Windows Control Panel to uninstall the primary software and meticulously review the installed programs list for any unwanted applications installed on the same date.",
    "Run a full system scan with an enterprise anti-malware and adware removal tool to catch any deeply embedded PUPs.",
    "Reset all browser settings to default to remove any hijacked search engines or malicious extensions."
  ],
  "what_to_avoid": [
    "Do not blindly click 'Next' or 'Express Install' when installing freeware; always choose the 'Custom' option to uncheck bundled software.",
    "Avoid downloading software from third-party download portals (e.g., CNET, Softonic); always source software directly from the official developer's website."
  ],
  "target_industries": [
    "Global / Opportunistic"
  ],
  "motivation": "Opportunistic",
  "threat_actors": [
    "Unknown / Cybercriminal"
  ],
  "target_geographies": [
    "Global"
  ],
  "attack_stage": [
    "execution",
    "persistence"
  ],
  "ecosystem": [
    "windows_pe"
  ],
  "is_emerging": false,
  "target_platforms": [
    "Windows 11",
    "Windows 10",
    "Windows 7"
  ]
}