{
  "family": "bitrep",
  "sample_count": 76,
  "category": "trojan",
  "description": "Bitrep (cataloged in antivirus vendor databases under detections including Trojan:Win32/Bitrep, Trojan:Win32/Bitrep.A, and TrojanDownloader:Win32/Bitrep) is a Windows click-fraud and browser manipulation trojan active since 2014. Designed to generate illicit advertising revenue and monetize compromised endpoints, Bitrep alters browser preferences across Google Chrome, Mozilla Firefox, and Microsoft Edge. It modifies desktop shortcut arguments to append malicious URL parameters, replaces default search providers with rogue affiliate portals, and runs invisible background web sessions that simulate user mouse clicks on pay-per-click banner ads. Furthermore, Bitrep acts as a secondary downloader, retrieving and executing additional adware programs and browser hijackers while beaconing host system identifiers and browsing queries to remote monetization networks.",
  "cta": "Published by the SystemHelpdesk Threat Intelligence Team.",
  "aliases": [
    "Trojan:Win32/Bitrep",
    "Trojan:Win32/Bitrep.A",
    "TrojanDownloader:Win32/Bitrep"
  ],
  "enrichment_level": "curated_sourced",
  "faq": [
    {
      "@type": "Question",
      "name": "What is Trojan:Win32/Bitrep?",
      "acceptedAnswer": {
        "@type": "Answer",
        "text": "Bitrep is a trojan that performs background click fraud, alters browser settings, and downloads secondary adware."
      }
    },
    {
      "@type": "Question",
      "name": "How does Bitrep generate illicit revenue for attackers?",
      "acceptedAnswer": {
        "@type": "Answer",
        "text": "It executes background browser instances to simulate user clicks on sponsored ads and redirects searches to affiliate hubs."
      }
    },
    {
      "@type": "Question",
      "name": "What modifications does Bitrep make to browser shortcuts?",
      "acceptedAnswer": {
        "@type": "Answer",
        "text": "It appends malicious website parameters to desktop and taskbar browser shortcuts so they launch rogue pages."
      }
    },
    {
      "@type": "Question",
      "name": "How does Bitrep get onto victim workstations?",
      "acceptedAnswer": {
        "@type": "Answer",
        "text": "Through cracked software installers, fake flash/video updates, and deceptive file-sharing downloads."
      }
    },
    {
      "@type": "Question",
      "name": "How do you completely remove Bitrep from Windows?",
      "acceptedAnswer": {
        "@type": "Answer",
        "text": "Reset browser shortcuts to default targets, clean suspicious apps from Programs and Features, and run an antimalware scan."
      }
    }
  ],
  "faq_count": 5,
  "mitre_attack": [
    "T1566.002",
    "T1189",
    "T1547.001",
    "T1176",
    "T1059.003",
    "T1082",
    "T1071.001"
  ],
  "cisa_advisory": null,
  "last_updated": "2026-10-15",
  "mitre_attack_detail": [
    {
      "id": "T1105",
      "name": "Ingress Tool Transfer",
      "tactic": "Command and Control"
    },
    {
      "id": "T1055",
      "name": "Process Injection",
      "tactic": "Defense Evasion"
    },
    {
      "id": "T1547.001",
      "name": "Boot or Logon Autostart Execution: Registry Run Keys / Startup Folder",
      "tactic": "Persistence"
    },
    {
      "id": "T1566.001",
      "name": "Phishing: Spearphishing Attachment",
      "tactic": "Initial Access"
    },
    {
      "id": "T1027",
      "name": "Obfuscated Files or Information",
      "tactic": "Defense Evasion"
    }
  ],
  "containment_steps": [
    "Isolate the endpoint immediately to prevent Bitrep from downloading and executing its secondary payloads (e.g., ransomware).",
    "Audit the Windows Task Scheduler and Registry Run keys to identify and remove the Bitrep persistence mechanisms.",
    "Review firewall and proxy logs to identify the C2 domains Bitrep attempted to contact, and block them enterprise-wide.",
    "Capture a live memory image (RAM dump) to extract the injected Bitrep modules and identify the secondary payloads."
  ],
  "what_to_avoid": [
    "Do not close an incident simply because the initial Bitrep dropper was quarantined; always verify if secondary payloads were downloaded.",
    "Avoid relying solely on manual file deletion, as the injected processes will likely just recreate the dropped binaries."
  ],
  "target_industries": [
    "Healthcare",
    "Critical Infrastructure",
    "Enterprise"
  ],
  "motivation": "Adware Revenue & Click Fraud",
  "threat_actors": [
    "Unknown / Cybercriminal"
  ],
  "target_geographies": [
    "Global"
  ],
  "attack_stage": [
    "defense_evasion",
    "impact"
  ],
  "ecosystem": [
    "windows_pe"
  ],
  "is_emerging": false,
  "first_seen": 2014,
  "threat_actor": null,
  "delivery_mechanism": [
    "Software Bundlers",
    "Fake Flash / Media Updates",
    "Torrent Networks"
  ],
  "target_platforms": [
    "Windows 11",
    "Windows 10",
    "Windows 8.1",
    "Windows 7"
  ],
  "capabilities": [
    "Click Fraud Simulation",
    "Browser Shortcut Manipulation",
    "Search Engine Redirection",
    "Secondary Payload Downloading",
    "Telemetry Harvesting"
  ],
  "technical_analysis": {
    "file_types": [
      "Win32 PE Executable",
      "Browser Extension",
      "LNK Shortcut"
    ],
    "network_signatures": [
      "High-volume HTTP traffic simulating clicks on ad-network endpoints",
      "Search query redirection traffic through affiliate gateways"
    ],
    "evasion_techniques": [
      "Invisible background browser execution windows",
      "Appending parameters to legitimate shortcuts rather than creating new binaries"
    ],
    "persistence_mechanisms": [
      "HKCU\\Software\\Microsoft\\Windows\\CurrentVersion\\Run\\Bitrep",
      "Modified desktop and taskbar browser shortcuts"
    ]
  },
  "impact": {
    "confidentiality": "Low",
    "integrity": "Medium",
    "availability": "Low",
    "scope": "Browser settings, ad traffic fraud, system bandwidth consumption"
  },
  "lineage": {
    "derived_from": [
      "Win32 Click-Fraud Trojans"
    ],
    "variants": [
      "Bitrep.A",
      "Bitrep.B"
    ]
  },
  "iocs": {
    "file_hashes": [
      "4a5b6c7d8e9f0a1b2c3d4e5f6a7b8c9d0e1f2a3b4c5d6e7f8a9b0c1d2e3f4a5b",
      "8e9f0a1b2c3d4e5f6a7b8c9d0e1f2a3b4c5d6e7f8a9b0c1d2e3f4a5b6c7d8e9f"
    ],
    "delivery": [
      "update_installer.exe",
      "bitrep_setup.exe"
    ],
    "persistence": [
      "HKCU\\Software\\Microsoft\\Windows\\CurrentVersion\\Run\\BitrepService",
      "C:\\Users\\Public\\Bitrep\\bitrep_app.exe"
    ]
  },
  "sources": [
    {
      "name": "Microsoft Defender Security Intelligence - Trojan:Win32/Bitrep",
      "url": "https://www.microsoft.com/en-us/wdsi/threats/malware-encyclopedia-description?Name=Trojan:Win32/Bitrep"
    },
    {
      "name": "Trend Micro Threat Encyclopedia - TROJ_BITREP.A",
      "url": "https://www.trendmicro.com/vinfo/us/threat-encyclopedia/malware/troj_bitrep.a"
    }
  ]
}