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

Executive Summary

\nOfferbox (often detected as Adware.OfferBox or PUP.OfferBox) is a highly intrusive Adware application and Potentially Unwanted Program. It is designed to aggressive monetize a user's web browsing by injecting unsolicited \"offers,\" coupons, and banner advertisements directly into the DOM (Document Object Model) of legitimate websites visited by the user, severely degrading system performance and posing a privacy risk.\n\n

Infection Vector and Technical Capabilities

\nOfferbox is almost exclusively distributed via software bundling. It is frequently packaged with \"free\" software (like media converters, PDF readers, or download managers) found on third-party download portals. If the user fails to decline the \"optional offer\" during installation, Offerbox is silently installed alongside the intended application.\n\nUpon execution, it deeply integrates into the operating system and web browsers:\n\n\n

Threat Assessment

\nWhile Offerbox is not inherently destructive like ransomware, it is highly undesirable. The constant ad injection consumes significant system resources, leading to browser crashes and slow page load times. Furthermore, the injected advertisements often lead to deceptive technical support scams or \"malvertising\" networks that distribute severe malware.\n\n

Remediation and Eradication

\n", "cta": "Published by the SystemHelpdesk team.", "aliases": [ "Adware.OfferBox", "PUP.OfferBox", "Win32/OfferBox" ], "enrichment_level": "expert-seo", "faq": [ { "@type": "Question", "name": "What is Offerbox and what threat category does it belong to?", "acceptedAnswer": { "@type": "Answer", "text": "Offerbox 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 Offerbox establish persistence and evade defensive controls?", "acceptedAnswer": { "@type": "Answer", "text": "Offerbox 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 Offerbox compromise?", "acceptedAnswer": { "@type": "Answer", "text": "Security teams responding to Offerbox 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 Adware.OfferBox employ during execution?", "acceptedAnswer": { "@type": "Answer", "text": "Adware.OfferBox 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 Adware.OfferBox, and what is the recommended recovery procedure?", "acceptedAnswer": { "@type": "Answer", "text": "Decryption availability for Adware.OfferBox 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": [ "T1185", "T1176", "T1546.015" ], "cisa_advisory": null, "last_updated": "2026-10-15", "type": "Adware / PUP", "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": "T1185", "name": "Browser Session Hijacking (Ad injection and tracking)", "tactic": "Collection" }, { "id": "T1176", "name": "Browser Extensions", "tactic": "Persistence" }, { "id": "T1546.015", "name": "Event Triggered Execution: Component Object Model Hijacking", "tactic": "Privilege Escalation" } ], "containment_steps": [ "Immediately isolate affected host(s) from the internal network (disconnect physical Ethernet and disable Wi-Fi/Bluetooth) to prevent Offerbox 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 Offerbox 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 Offerbox 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 Offerbox 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 Offerbox.", "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 Offerbox eradication is completely verified." ], "target_platforms": [ "Windows 11", "Windows 10", "Windows Server 2022", "Windows Server 2019" ] }