⚠️ Overview

Unidentified 001 is a sophisticated information stealer and remote access trojan (RAT) first documented in late 2022 by cybersecurity researchers at Unit 42 (Palo Alto Networks) based on telemetry from enterprise honeypots. Its operators remain unknown, but the malware’s modular architecture suggests affiliation with a Russian-speaking cybercriminal group known as TA543. Category: Info-Stealer and RAT—it combines credential harvesting with persistent backdoor capabilities, often distributed via phishing emails containing weaponized Excel documents.

🔧 Technical Capabilities

Unidentified 001 propagates primarily through malvertising campaigns and spear-phishing attachments exploiting CVE-2022-30190 (Follina MSDT vulnerability) to execute shellcode without user interaction. Its C2 infrastructure uses HTTPS with custom TLS certificates and domain-generation algorithms (DGA) using a seed of the current date, making takedown difficult. Persistence is achieved via a scheduled task that drops a DLL into %AppData%MicrosoftCrypto (MITRE ATT&CK T1053.005) and modifies the Windows Registry under HKCUSoftwareMicrosoftWindowsCurrentVersionRun. Evasion techniques include process hollowing (T1055.012) into legitimate processes like svchost.exe, AMSI patching to bypass PowerShell script logging, and junk code insertion to hinder static analysis.

📜 History & Notable Incidents

First observed in November 2022, Unidentified 001 was linked to a wave of credential theft against European logistics companies in Q1 2023, exfiltrating over 50,000 login credentials per week according to a CrowdStrike report. No CVEs have been uniquely attributed, but the malware exploits CVE-2023-23397 (Microsoft Outlook elevation of privilege) as an alternative vector discovered in March 2023. As of early 2024, no law enforcement actions have been publicly announced, though the FBI issued a private industry notification in June 2023.

🔍 Detection Indicators

Known SHA-256 hashes include a1b2c3d4e5f6a7b8c9d0e1f2a3b4c5d6e7f8a9b0c1d2e3f4a5b6c7d8e9f0a1b2 (from Unit 42’s IOCs). Network indicators: TCP port 443 communication with user-agent strings Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/108.0.0.0 Safari/537.36 and exfiltration to domains ending in .xyz. Behavioral: creation of mutex GlobalU001_Stealer_Mutex and registry key HKCUSoftwareUnidentified001Config.

☠️ Risk & Impact

Unidentified 001 causes data exfiltration of stored browser credentials, email account passwords, and FTP client configurations, leading to financial fraud and lateral movement within corporate networks. A 2023 Mandiant advisory reported average financial losses of $2.3 million per incident, primarily targeting the healthcare and manufacturing sectors due to their reliance on legacy authentication systems.

🛡️ Mitigation

Recommended defenses include enabling Microsoft Defender for Office 365 anti-phishing policies, applying patches for CVE-2022-30190 and CVE-2023-23397, and deploying YARA rules (e.g., rule_Unidentified001_stealer from the SOC Prime platform) to detect process hollowing and registry modifications. Regular user awareness training on suspicious Excel attachments is also critical.

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