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

Executive Summary

\nPeflog (PE File Logger) is a classification for a specific type of Information Stealer (Info-Stealer) focused primarily on monitoring system activity and exfiltrating data. Unlike broader banking trojans, Peflog is designed for targeted espionage, quietly logging keystrokes, capturing screenshots, and aggressively searching the filesystem for specific file types (often source code, documents, or cryptographic keys).\n\n

Infection Vector and Technical Capabilities

\nPeflog is typically distributed via spear-phishing campaigns targeting specific individuals or organizations, or it is dropped as a secondary payload by an initial access broker.\n\nUpon execution, it performs a highly aggressive, targeted data harvesting operation:\n\n\n

Threat Assessment

\nA Peflog infection is a critical data breach and espionage incident. The malware is designed to operate silently over long periods, continuously bleeding sensitive intellectual property, strategic documents, and user credentials out of the network.\n\n

Incident Response and Remediation

\n", "cta": "Published by the SystemHelpdesk team.", "aliases": [ "Trojan.Peflog", "PWS.Peflog", "TrojanSpy.Peflog" ], "enrichment_level": "expert-seo", "faq": [ { "@type": "Question", "name": "What is Peflog and what threat category does it belong to?", "acceptedAnswer": { "@type": "Answer", "text": "Peflog 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 Peflog establish persistence and evade defensive controls?", "acceptedAnswer": { "@type": "Answer", "text": "Peflog 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 Peflog compromise?", "acceptedAnswer": { "@type": "Answer", "text": "Security teams responding to Peflog 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.Peflog?", "acceptedAnswer": { "@type": "Answer", "text": "Trojan.Peflog 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.Peflog across enterprise endpoints?", "acceptedAnswer": { "@type": "Answer", "text": "Defenders should hunt for Trojan.Peflog 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", "T1119", "T1048", "T1113" ], "cisa_advisory": null, "last_updated": "2026-10-15", "type": "Information Stealer / Keylogger", "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": "T1119", "name": "Automated Collection", "tactic": "Collection" }, { "id": "T1048", "name": "Exfiltration Over Alternative Protocol", "tactic": "Exfiltration" }, { "id": "T1113", "name": "Screen Capture", "tactic": "Collection" } ], "containment_steps": [ "Sever network connectivity for the flagged endpoint to terminate persistent command-and-control (C2) communication channels and stop Peflog from retrieving secondary stage payloads.", "Capture process memory triage to detect and terminate malicious threads injected by Peflog 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 Peflog 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 Peflog execution timeframe." ], "what_to_avoid": [ "Do not assume the incident is resolved simply because an antivirus tool removed the initial Peflog 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 Peflog 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" ] }