BullWall Ransomware Containment supports configurable file and directory exclusions such as ‘$RECYCLE.BIN’ to balance monitoring scope and performance. Certain exclusion patterns could allow an authenticated attacker to rename directories in a way that avoids monitoring. Fixed in 4.6.1.14 and 5.0.0.42, which remove hardcoded exclusion behavior and exposes exclusion handling as configurable settings.
This issue has been fixed and released in RC 4.6.1.14 and 5.0.0.42, with improved exclusion handling and safer defaults.
BullWall does not currently provide a detection for this issue.
BullWall thanks the reporter for responsibly disclosing this issue.