Real time lockdown

• US 8,959,642 B2
• Filed: 05/23/2013
• Issued: 02/17/2015
• Est. Priority Date: 12/28/2005
• Status: Active Grant

• Current Assignee: Forcepoint LLC
• Original Assignee: Forcepoint LLC
• Inventors: Sharma, Rajesh Kumar, Lo, Winping, Papa, Joseph
• Primary Examiner(s): LEE, JASON T
• Application Number:
  US13/900,954
• Publication Number:
  US 20130254839A1
• Time in Patent Office: 635 Days
• Field of Search: 726/1, 726/4, 726/22, 726/24, 713/150, 713/156, 713/176
• US Class Current: 726/24
• CPC Class Codes: G06F 21/51 at application loading time, e.g. accepting, rejecting, starting or inhibiting executable software based on integrity or source reliability
• CPC Class Codes: G06F 21/54 by adding security routines or objects to programs
• CPC Class Codes: G06F 21/554 involving event detection and direct action
• CPC Class Codes: G06F 21/56 Computer malware detection or handling, e.g. anti-virus arrangements
• CPC Class Codes: G06F 21/60 Protecting data

Abstract

A system and method that trusts software executables existent on a machine prior to activation for different types of accesses e.g. execution, network, and registry. The system detects new executables added to the machine as well as previously existent executables that have been modified, moved, renamed or deleted. In certain embodiments, the system will tag the file with a flag as modified or newly added. Once tagged, the system intercepts particular types of file accesses for execution, network or registry. The system determines if the file performing the access is flagged and may apply one or more policies based on the requested access. In certain embodiments, the system intercepts I/O operations by file systems or file system volumes and flags metadata associated with the file. For example, the NT File System and its extended attributes and alternate streams may be utilized to implement the system.

Claims

1. A method of managing access to a computer file stored by a computer file system, the computer file comprising file data and file meta data, the method comprising:

generating, via an electronic processor, a hash based at least in part on the file meta data;

writing the hash to the file meta data;

writing a first indicator to the file meta data in response to detecting an attempt to modify the computer file; and

applying, via an electronic processor, an access policy to the computer file based at least partially on the hash in the file meta data.

2. The method of claim 1, wherein the hash is not based on the file data.

3. The method of claim 1, wherein the computer file system is a Windows NT file system (NTFS), and the file meta data comprises extended attributes and alternate streams.

4. The method of claim 1, further comprising writing a second indicator to the file meta data in response to an attempt to create the computer file.

5. An apparatus for managing access to a computer file stored by a computer file system, the computer file comprising file data and file meta data, the apparatus comprising:

An electronic processor;

a memory, operably connected to the electronic processor, the memory configured to store instructions that configure the processor to;

generate a hash based at least in part on the file meta data,

write the hash to the file meta data,

write a first indicator to the file meta data in response to detecting an attempt to modify the computer file, and

apply an access policy to the computer file based at least partially on the hash in the file meta data.

6. The apparatus of claim 5, wherein the memory further stores instructions that configure the electronic processor to write a second indicator to the file meta data in response to a creation of the computer file.

7. The apparatus of claim 5, wherein the hash is not based on the file data.

8. The method of claim 5, wherein the computer file system is a Windows NT file system (NTFS), and the file meta data comprises extended attributes and alternate streams.

9. An apparatus for managing access to a computer file stored by a computer file system, the computer file comprising file data and file meta data, the apparatus comprising:

an electronic processor;

a memory, operably connected to the electronic processor;

means for generating a hash based at least in part on the file meta data;

means for writing the hash to the file meta data;

means for writing a first indicator to the file meta data in response to an attempt to modify the computer file; and

means for applying an access policy to the computer file based at least partially on the hash in the file meta data.

10. The apparatus of claim 9, further comprising means for writing a second indicator to the file meta data in response to a creation of the computer file.

11. The apparatus of claim 9, wherein the means for writing a first indicator to the file meta data is a file system filter driver executing on the electronic processor.

12. The apparatus of claim 9, wherein the means for storing the file meta data in the memory is a file system filter driver executing on the electronic processor.

13. The apparatus of claim 9, wherein the means for applying an access policy to the file based at least partially on the first indicator is a file system filter driver executing on the electronic processor.

14. A non-transitory computer-readable storage medium comprising instructions that when executed cause an electronic processor to perform a method of managing access to a computer file stored by a computer file system, the computer file comprising file data and file meta data, the method comprising:

generating a hash based at least in part on the file meta data;

writing the hash to the file meta data;

writing a first indicator to the file meta data in response to detecting an attempt to modify the computer file; and

applying an access policy to the computer file based at least partially on the hash in the file meta data.

15. The computer-readable storage medium of claim 14, wherein the hash is not based on the file data.

16. The computer-readable storage medium of claim 14, the method further comprising writing a second indicator to the file meta data in response to detecting an attempt to create the computer file.