The flaw existed in unacev2.dll , a third-party library WinRAR used to unpack files. Path Traversal: Attackers could bypass folder restrictions.
Files could be dropped into the Windows Startup folder .
The file is a well-known proof-of-concept (PoC) archive used to demonstrate a critical vulnerability in WinRAR (tracked as CVE-2018-20250 ). 22793.rar
When a user opens "22793.rar" (or similar ACE-based exploits):
Always run an antivirus scan on archives from unknown sources. If you'd like, I can help you with: Analyzing a specific file you found with this name. Patching your system to ensure you aren't vulnerable. Finding the original research by Check Point Software. The flaw existed in unacev2
WinRAR failed to properly sanitize these paths, allowing the file to be written outside the intended extraction folder. ⚠️ Security Implications
For years, this was one of the most "reliable" ways for hackers to infect systems because: Users generally trust .rar files. The file is a well-known proof-of-concept (PoC) archive
The malware would run automatically the next time the user logged in. 📂 Technical Breakdown