The analysis of the BTR.sys driver reveals several critical security vulnerabilities and operational characteristics that can be exploited for malicious purposes. Here's a summary of key findings:
Vulnerabilities
Arbitrary File Write/Move
- Structure:
[Flags] [Path] - Effect: The driver writes or moves files to arbitrary locations, including system directories like
System32. - Weaponization: Malicious DLLs can be dropped into critical paths for persistence and privilege escalation.
Registry Operations
- Delete Key (Action 4):
[Flags] [Key Path]- Deletes a registry key and its subkeys.
- Delete Value (Action 5):
[Flags] [Key Path + "\\" + Value Name]- Requires specific formatting with double backslashes (
\\).
- Requires specific formatting with double backslashes (
- Set Value (Action 6):
[Flags] [Type] [Size] [Key Path + "\\" + Value Name] [Data]- Allows arbitrary registry writes, including key creation.
- Can be used for persistence mechanisms or disabling security controls.
Operational Findings
Success Error Code
- Return Value: `0xC0000056
Read the full article at Check Point Research
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