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

Executive Summary

\nPassCV is a highly specialized credential stealer designed to extract stored passwords, autocomplete data, and sensitive session tokens from compromised Windows environments. It primarily targets web browsers, email clients, and FTP applications, acting as an automated data harvesting tool for threat actors.\n\n

Infection Vector and Extraction Methodology

\nPassCV is often deployed as a secondary payload, dropped by an initial access broker or a generic downloader trojan following a successful phishing campaign. It is engineered for rapid execution; its goal is to extract data and exfiltrate it before the victim or security tools can respond.\n\nUpon execution, PassCV scans the host system for installed applications known to store credentials locally. It targets the underlying SQLite databases and encrypted credential stores of popular web browsers (Google Chrome, Mozilla Firefox, Microsoft Edge), email clients (Microsoft Outlook, Thunderbird), and FTP clients (FileZilla). \n\nPassCV utilizes native Windows APIs (such as `CryptUnprotectData` within the DPAPI - Data Protection API framework) to decrypt the stored passwords locally. The harvested data—which includes URLs, usernames, passwords, and occasionally credit card numbers—is aggregated into a single file, compressed, and exfiltrated to a command-and-control (C2) server via HTTP POST requests.\n\n

Security and Privacy Implications

\nA PassCV infection is a critical security incident that often precedes lateral movement or data breaches. The rapid theft of browser-stored credentials provides attackers with immediate, authenticated access to corporate web applications, cloud infrastructure (e.g., AWS, Azure), and internal portals.\n\n

Incident Response and Mitigation

\n", "cta": "Published by the SystemHelpdesk team.", "aliases": [ "Trojan.PassCV", "PasswordStealer.PassCV", "Win32/PassCV" ], "enrichment_level": "expert-seo", "faq": [ { "@type": "Question", "name": "What is Passcv and what threat category does it belong to?", "acceptedAnswer": { "@type": "Answer", "text": "Passcv 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 Passcv establish persistence and evade defensive controls?", "acceptedAnswer": { "@type": "Answer", "text": "Passcv 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 Passcv compromise?", "acceptedAnswer": { "@type": "Answer", "text": "Security teams responding to Passcv 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.PassCV?", "acceptedAnswer": { "@type": "Answer", "text": "Trojan.PassCV 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.PassCV across enterprise endpoints?", "acceptedAnswer": { "@type": "Answer", "text": "Defenders should hunt for Trojan.PassCV 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": [ "T1555.003", "T1003", "T1048", "T1552.001" ], "cisa_advisory": null, "last_updated": "2026-10-15", "type": "Credential 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": "T1555.003", "name": "Credentials from Web Browsers", "tactic": "Unknown" }, { "id": "T1003", "name": "OS Credential Dumping (Built-in Mimikatz integration)", "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 Passcv from retrieving secondary stage payloads.", "Capture process memory triage to detect and terminate malicious threads injected by Passcv 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 Passcv 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 Passcv execution timeframe." ], "what_to_avoid": [ "Do not assume the incident is resolved simply because an antivirus tool removed the initial Passcv 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 Passcv 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" ] }