{ "family": "keyer", "sample_count": 1, "category": "advanced_threat", "description": "

Executive Summary

\nKeyer is a dedicated, malicious Keylogger and Information Stealer. Its primary objective is to silently monitor a victim's keystrokes, capturing passwords, personal communications, and sensitive financial data without the user's knowledge, and transmitting this harvested intelligence to remote cybercriminals.\n\n

Infection Vector and Technical Capabilities

\nKeyer is typically distributed via spear-phishing campaigns containing malicious attachments, software bundling (hidden within \"free\" or cracked applications), or as a secondary payload dropped by an initial access broker.\n\nOnce executed, Keyer establishes deep system hooks to monitor user input:\n\n\n

Threat Assessment

\nA Keyer infection is a severe privacy and security breach. Because it captures data at the hardware input level, it completely bypasses the encryption of HTTPS websites and renders standard password complexity rules useless, as the attacker receives the password exactly as it is typed.\n\n

Incident Response and Remediation

\n", "cta": "Published by the SystemHelpdesk team.", "aliases": [ "Trojan.Keylogger.Keyer", "Spyware.Keyer", "Win32/Keyer" ], "enrichment_level": "expert-seo", "faq": [ { "@type": "Question", "name": "What is Keyer and what threat category does it belong to?", "acceptedAnswer": { "@type": "Answer", "text": "Keyer is classified as a Advanced Threat. 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 Keyer establish persistence and evade defensive controls?", "acceptedAnswer": { "@type": "Answer", "text": "Keyer 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 Keyer compromise?", "acceptedAnswer": { "@type": "Answer", "text": "Security teams responding to Keyer 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 lateral movement and credential access tactics does Trojan.Keylogger.Keyer leverage in enterprise intrusions?", "acceptedAnswer": { "@type": "Answer", "text": "Trojan.Keylogger.Keyer frequently utilizes privileged account harvesting techniques such as LSASS memory dumping, Kerberoasting, and token impersonation to escalate privileges. Once administrative credentials are acquired, it pivots across the victim network utilizing living-off-the-land binaries (LOLBins) such as WMI, PowerShell remoting, and PsExec, or abuses remote desktop protocols (RDP) to reach critical internal repositories and domain controllers." } }, { "@type": "Question", "name": "How does Trojan.Keylogger.Keyer maintain covert communications and evade perimeter network monitoring?", "acceptedAnswer": { "@type": "Answer", "text": "Trojan.Keylogger.Keyer often relies on multi-stage command and control (C2) architectures utilizing encrypted protocols over standard web ports (HTTPS/443 or DNS tunneling) to blend in with legitimate enterprise network traffic. Many variants incorporate proxy networks, domain fronting, or cloud services (such as Microsoft Graph API, Google Drive, or Telegram) to masquerade C2 channels, bypassing traditional signature-based egress filtering." } } ], "faq_count": 5, "mitre_attack": [ "T1056.001", "T1114", "T1547.001" ], "cisa_advisory": null, "last_updated": "2026-10-15", "type": "Keylogger / Info Stealer", "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": "T1114", "name": "Email Collection (Harvesting addresses for spamming)", "tactic": "Collection" }, { "id": "T1547.001", "name": "Boot or Logon Autostart Execution: Registry Run Keys / Startup Folder", "tactic": "Persistence" } ], "containment_steps": [ "Enforce forensic network isolation on all suspected endpoints while maintaining an out-of-band telemetry conduit to capture live Keyer adversary activity.", "Perform full memory dumps across identified staging nodes to extract memory-only implants, kernel rootkit hooks, and decrypted Keyer C2 infrastructure IP/domain lists.", "Review Active Directory domain controller authentication logs for anomalous Kerberos ticket requests (Pass-the-Ticket, Golden Ticket) and unauthorized DCSync operations associated with Keyer.", "Block all confirmed C2 domains, dynamic DNS endpoints, and proxy IP addresses across perimeter firewalls, proxies, and DNS security gateways.", "Conduct an enterprise-wide sweep across surrounding subnets for secondary webshells, WMI event subscriptions, or remote execution tooling left behind by Keyer operators." ], "what_to_avoid": [ "Do not assume the incident is resolved simply because an antivirus tool removed the initial Keyer 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 Keyer 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 Server 2022", "Windows Server 2019" ] }