{ "family": "pcbooster", "sample_count": 1, "category": "ransomware", "description": "

Executive Summary

\nPCBooster is a deceptive Potentially Unwanted Program (PUP) that operates as \"Rogue Security Software\" or a fake system optimizer. It employs classic scareware tactics, performing superficial or completely fabricated system \"scans\" to generate alarming false-positive reports about fragmented drives, registry errors, or impending hardware failures. Its sole objective is to frighten the user into purchasing a \"premium license\" to fix the non-existent problems.\n\n

Infection Vector and Technical Capabilities

\nPCBooster relies almost entirely on aggressive malvertising and deceptive software bundling. Users typically encounter it via alarming pop-up ads claiming their \"PC is critically slow\" or when downloading freeware from third-party aggregators, where the utility is installed silently in the background.\n\nOnce installed, the software employs highly aggressive extortion tactics:\n\n\n

Threat Assessment

\nWhile technically not destructive malware like a file-encrypting ransomware, PCBooster poses a severe threat to user productivity and financial security (extortion). The aggressive persistence mechanisms cause significant IT helpdesk overhead, and the constant alarming pop-ups create severe disruption.\n\n

Incident Response and Remediation

\n", "cta": "Published by the SystemHelpdesk team.", "aliases": [ "Rogue.PCBooster", "PUP.FakeOptimizer", "Scareware.Win32" ], "enrichment_level": "expert-seo", "faq": [ { "@type": "Question", "name": "What is Pcbooster and what threat category does it belong to?", "acceptedAnswer": { "@type": "Answer", "text": "Pcbooster 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 Pcbooster establish persistence and evade defensive controls?", "acceptedAnswer": { "@type": "Answer", "text": "Pcbooster 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 Pcbooster compromise?", "acceptedAnswer": { "@type": "Answer", "text": "Security teams responding to Pcbooster 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 Rogue.PCBooster employ during execution?", "acceptedAnswer": { "@type": "Answer", "text": "Rogue.PCBooster 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 Rogue.PCBooster, and what is the recommended recovery procedure?", "acceptedAnswer": { "@type": "Answer", "text": "Decryption availability for Rogue.PCBooster 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": [ "T1491", "T1562.001", "T1112" ], "cisa_advisory": null, "last_updated": "2026-10-15", "type": "Rogue Software / Scareware", "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": "T1491", "name": "Defacement (Displaying fake security warnings / Scareware)", "tactic": "Impact" }, { "id": "T1562.001", "name": "Impair Defenses: Disable or Modify Tools", "tactic": "Defense Evasion" }, { "id": "T1112", "name": "Modify Registry", "tactic": "Defense Evasion" } ], "containment_steps": [ "Immediately isolate affected host(s) from the internal network (disconnect physical Ethernet and disable Wi-Fi/Bluetooth) to prevent Pcbooster 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 Pcbooster 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 Pcbooster 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 Pcbooster 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 Pcbooster.", "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 Pcbooster eradication is completely verified." ], "target_platforms": [ "Windows 11", "Windows 10", "Windows Server 2022", "Windows Server 2019" ] }