๐The Next Web (TNW)โขStalecollected in 41m
Russian hackers exploit patched WinRAR flaw against Ukraine
๐กCritical security reminder: unpatched legacy software remains a primary vector for state-sponsored cyber attacks.
โก 30-Second TL;DR
What Changed
Exploitation of CVE-2025-8088, a path traversal vulnerability.
Why It Matters
This incident underscores the critical importance of patch management in enterprise environments. It demonstrates how legacy vulnerabilities continue to be weaponized in geopolitical cyber warfare.
What To Do Next
Audit your software supply chain and ensure all instances of WinRAR are updated to the latest version to prevent exploitation.
Who should care:Enterprise & Security Teams
Key Points
- โขExploitation of CVE-2025-8088, a path traversal vulnerability.
- โขTargets include Ukrainian government and military personnel.
- โขMalware used is designed for credential theft.
- โขVulnerability remains effective despite existing patches.
๐ง Deep Insight
Web-grounded analysis with 7 cited sources.
๐ Enhanced Key Takeaways
- โขThe vulnerability, identified as CVE-2025-8088, is a path traversal flaw that allows attackers to leverage NTFS Alternate Data Streams (ADS) to write malicious files to arbitrary locations on a system.
- โขCVE-2025-8088 was discovered and patched in July 2025 with the release of WinRAR version 7.13, yet exploitation by various threat actors continued at least until April 2026.
- โขMultiple Russian-aligned hacking groups, including RomCom (Void Rabisu), Sandworm, Turla, Earth Dahu (Gamaredon), and SHADOW-EARTH-066 (UAC-0226), have actively exploited CVE-2025-8088.
- โขThe malware deployed through this exploit, such as an updated version of the GIFTEDCROOK information stealer, specifically targets passwords and cookies from Chromium-based browsers (like Google Chrome and Microsoft Edge) and Mozilla Firefox, in addition to harvesting documents.
- โขThe exploit chain often involves dropping a Windows Shortcut (LNK) file into the Startup folder for persistence, which then executes a PowerShell loader to launch the information stealer, demonstrating a shift from previous Excel macro droppers.
๐ ๏ธ Technical Deep Dive
- Vulnerability Type: Path Traversal leading to arbitrary file write and potential Remote Code Execution (RCE).
- CVE ID: CVE-2025-8088.
- Affected Versions: WinRAR for Windows versions up to 7.12.
- Patch: Fixed in WinRAR version 7.13, released on July 30, 2025.
- Exploit Mechanism: Attackers craft malicious RAR archives that, when opened by a vulnerable WinRAR version, incorrectly parse a malicious Alternate Data Stream (ADS) name containing directory traversal paths (e.g.,
..\..\..\). This allows the embedded payload within the ADS to be written outside the intended extraction directory, often into critical locations like the Windows Startup folder for persistence. - User Interaction: User interaction is required, typically by opening a malicious archive, often disguised with a decoy document (e.g., PDF).
- Payload Delivery: The exploit chain often involves dropping a Windows Shortcut (LNK) file into the Startup folder, which then executes a PowerShell loader to launch an information stealer.
๐ฎ Future ImplicationsAI analysis grounded in cited sources
Persistent exploitation of patched vulnerabilities will continue to be a significant threat, especially for widely used software.
The ongoing exploitation of CVE-2025-8088 almost a year after its patch demonstrates that slow patch adoption and unmanaged software updates provide a prolonged window for attackers.
Nation-state actors will continue to adapt their initial access vectors to leverage prevalent software flaws.
Russian-aligned groups shifted from Excel macro droppers to WinRAR exploits, indicating a continuous search for effective and widely applicable vulnerabilities for initial access.
โณ Timeline
2025-07-18
Exploitation of CVE-2025-8088 in the wild began, with RARLAB releasing WinRAR version 7.13 to patch the vulnerability shortly after on July 30, 2025.
2025-08
Reports emerge of Russia-aligned group RomCom exploiting CVE-2025-8088 against various sectors in Europe and Canada.
2025-09-15
CVE-2025-8088 included in CISA's Known Exploited Vulnerabilities (KEV) Catalog, underscoring its active exploitation.
2026-04
Russian-aligned groups like Earth Dahu and SHADOW-EARTH-066 continued producing new exploit samples for CVE-2025-8088.
2026-06-08
Trend Micro reports ongoing exploitation of CVE-2025-8088 by multiple intrusion sets targeting Ukrainian organizations.
๐ Sources (7)
Factual claims are grounded in the sources below. Forward-looking analysis is AI-generated interpretation.
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Original source: The Next Web (TNW) โ