{ "family": "harvester", "sample_count": 1, "category": "trojan", "description": "

Executive Summary

\nHarvester (often detected as Spyware.Harvester or Trojan.Harvester) is a highly specialized info-stealer malware engineered specifically to target, aggregate, and extract sensitive data from compromised Windows endpoints. Unlike generic droppers, Harvester's primary objective is immediate espionage: it actively scrapes the file system and intercepts communications to harvest user credentials, financial information, and valuable intellectual property.\n\n

Infection Vector and Technical Capabilities

\nHarvester is typically distributed via highly targeted spear-phishing campaigns containing weaponized attachments or delivered as a secondary payload by an initial access broker.\n\nOnce executed, the malware focuses entirely on data aggregation:\n\n\n

Threat Assessment

\nA Harvester infection is a critical security breach resulting in immediate and ongoing data loss. The exfiltrated credentials can be used to compromise the user's personal accounts, pivot laterally across the corporate network, or access sensitive cloud infrastructure without triggering brute-force alerts.\n\n

Incident Response and Remediation

\n", "cta": "Published by the SystemHelpdesk team.", "aliases": [ "Trojan.Harvester", "Spyware.Harvester", "PWS.Win32.Harvester" ], "enrichment_level": "expert-seo", "faq": [ { "@type": "Question", "name": "What is Harvester and what threat category does it belong to?", "acceptedAnswer": { "@type": "Answer", "text": "Harvester 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 Harvester establish persistence and evade defensive controls?", "acceptedAnswer": { "@type": "Answer", "text": "Harvester 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 Harvester compromise?", "acceptedAnswer": { "@type": "Answer", "text": "Security teams responding to Harvester 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 Trojan.Harvester?", "acceptedAnswer": { "@type": "Answer", "text": "Trojan.Harvester 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 Trojan.Harvester across enterprise endpoints?", "acceptedAnswer": { "@type": "Answer", "text": "Defenders should hunt for Trojan.Harvester 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": [ "T1056.001", "T1539", "T1048", "T1552.001" ], "cisa_advisory": null, "last_updated": "2026-10-15", "type": "Info-stealer / Spyware", "target_industries": [ "Global / Opportunistic" ], "motivation": "Opportunistic", "threat_actors": [ "Unknown / Cybercriminal" ], "target_geographies": [ "Global" ], "attack_stage": [ "execution", "persistence" ], "ecosystem": [ "windows_pe" ], "is_emerging": false, "mitre_attack_detail": [ { "id": "T1056.001", "name": "Keylogging", "tactic": "Credential Access" }, { "id": "T1539", "name": "Steal Web Session Cookie (Abusing active authenticated sessions to perform social media fraud)", "tactic": "Credential Access" }, { "id": "T1048", "name": "Exfiltration Over Alternative Protocol", "tactic": "Exfiltration" }, { "id": "T1552.001", "name": "Credentials In Files (Harvesting passwords and wallets from local storage)", "tactic": "Credential Access" } ], "containment_steps": [ "Sever network connectivity for the flagged endpoint to terminate persistent command-and-control (C2) communication channels and stop Harvester from retrieving secondary stage payloads.", "Capture process memory triage to detect and terminate malicious threads injected by Harvester into legitimate system processes such as explorer.exe or svchost.exe.", "Audit Windows Registry Run keys (HKCU\\Software\\Microsoft\\Windows\\CurrentVersion\\Run) and Task Scheduler entries to locate and purge Harvester persistence hooks.", "Deploy updated enterprise EDR detection signatures and conduct an out-of-band endpoint scan to isolate dropped binaries and staged payloads.", "Rotate all credentials, domain user passwords, and session cookies active on the system during the Harvester execution timeframe." ], "what_to_avoid": [ "Do not assume the incident is resolved simply because an antivirus tool removed the initial Harvester dropper; always verify that secondary payloads and persistence hooks have been eradicated.", "Avoid logging in with Domain Admin or privileged credentials on a machine suspected of running Harvester until memory triage is complete.", "Do not delay host isolation; automated lateral movement and credential dumping can occur within minutes of initial execution." ], "target_platforms": [ "Windows 11", "Windows 10", "Windows 7" ] }