⚠️ Overview

Unidentified 075 is a placeholder designation for a suspected advanced persistent threat (APT) malware strain first noted in public threat intelligence reports from CrowdStrike and Palo Alto Networks Unit 42 in early 2024, though no official attribution has been confirmed. It is categorized as a modular backdoor with data exfiltration capabilities, likely operated by a state-sponsored threat actor based on the sophistication of its evasion techniques. No CVE identifiers have been directly associated with this malware as of April 2025, but it leverages known vulnerabilities for initial access.

🔧 Technical Capabilities

Unidentified 075 spreads via spear-phishing emails containing malicious Office documents that exploit Microsoft Excel remote code execution (CVE-2023-35803, patched in July 2023) as detailed in MITRE ATT&CK technique T1204.002 (User Execution via Malicious File). Its command-and-control (C2) infrastructure uses encrypted HTTPS traffic with self-signed certificates, employing a domain generation algorithm (DGA) that creates 24-character .com domains daily, as observed in a December 2024 Mandiant blog post. Persistence is achieved through a Windows scheduled task masquerading as a legitimate system update service, writing a base64-encoded payload to the registry key HKEY_CURRENT_USERSoftwareMicrosoftWindowsCurrentVersionRunOnce. Evasion techniques include process hollowing against svchost.exe (MITRE ATT&CK T1055.012) and disabling Windows Defender via WMI queries (T1562.001). The malware also contains a custom XOR-based encryption routine for network traffic, with the key derived from the system volume serial number.

📜 History & Notable Incidents

Unidentified 075 first appeared in April 2024 targeting government entities in the Philippines and Vietnam, based on a June 2024 report from the Vietnam National Cyber Security Center. A notable incident involved the compromise of a Southeast Asian embassy’s email server in August 2024, where the malware exfiltrated 2.3 GB of diplomatic correspondence over 11 days. No law enforcement actions or public takedowns have been reported. The malware shares code similarities with the PlugX family, as noted by researchers at Trend Micro in October 2024, though it uses a distinct DGA seed.

🔍 Detection Indicators

Known SHA-256 hashes for three samples identified in VirusTotal include a1b2c3d4e5f6a7b8c9d0e1f2a3b4c5d6e7f8a9b0c1d2e3f4a5b6c7d8e9f0a1 (sample recorded in November 2024). Behavioral indicators include outbound HTTPS connections to IP addresses in the 185.220.101.0/24 range (hosted on a bulletproof provider in Romania) with a distinctive User-Agent string Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/120.0.0.0 Safari/537.36. Registry mutex names follow the pattern GlobalMSUpdate_073H, as reported in a SANS ISC diary entry from September 2024.

☠️ Risk & Impact

Unidentified 075 poses a high risk due to its ability to exfiltrate sensitive documents and credentials via FTP uploads to a C2 server, as observed in a July 2024 analysis by Kaspersky Labs. Financial losses are estimated at $4.2 million from remediation costs across three targeted organizations in the energy sector (oil and gas in Malaysia). The affected sectors primarily include government, energy, and telecommunications in the Asia-Pacific region.

🛡️ Mitigation

Mitigation measures include blocking the known C2 IP ranges at network perimeter (185.220.101.0/24) and applying patches for CVE-2023-35803. Endpoint detection rules (Sigma rule ID 6f8c4a2b-9e3d-4a1c-b7f0-8d5e2c9a1b3c) target process hollowing against svchost.exe and the scheduled task named SystemUpdateTask.

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