TRUSTED SECURE DESKTOP

• US 20090187991A1
• Filed: 01/21/2009
• Published: 07/23/2009
• Est. Priority Date: 01/22/2008
• Status: Active Grant

• Current Assignee: Wontok, Inc. (Wontok Enterprises Pty Ltd.)
• Original Assignee: SafeCentral, Inc. (Wontok Enterprises Pty Ltd.)
• Inventors: Sharp, John C., Freericks, Helmuth, Kouznetsov, Oleg
• Granted Patent: US 8,225,404 B2
• Time in Patent Office: Days
• US Class Current: 726/24
• CPC Class Codes: G06F 21/57 Certifying or maintaining trusted computer platforms, e.g. secure boots or power-downs, version controls, system software checks, secure updates or assessing vulnerabilities

Abstract

Systems and methods for simultaneously protecting software components (150) installed on a computer system (102) against malware. The methods involve executing a first end user application (318₁, 318₂, . . . , 318_p) to the computer system (102) which execute in user mode on a trusted secure desktop (904). The trusted secure desktop is configured to run simultaneously with an unsecure desktop (902). The methods also involve performing a security service operation to protect the first end user application against malware. The security service operations include a keylogger prevention service operation, a code injection prevention service operation, a screen scraper protection service operation, a process termination prevention service operation, or a Domain Name System service operation.

Claims

1. A method for simultaneously protecting a plurality of software components installed on a computer system against malware, comprising:

executing a trusted secure desktop simultaneously with an unsecure desktop of the computer system;

executing at least one first end user application installed on the computer system which executes in user mode on the trusted secure desktop; and

performing at least one security service operation at the computer system to protect the first end user application against malware.

2. The method according to claim 1, wherein the at least one security service operation is performed by the trusted secure desktop and an underlying security software including a user mode software configured to communicate with the trusted secure desktop and a kernel mode software configured to communicate with the user mode software and an operating system of the computer system.

3. The method according to claim 1, wherein the security service operation includes at least one operation selected from the group consisting of a keylogger prevention service operation, a code injection prevention service operation, a screen scraper protection service operation, a process termination prevention service operation, and a Domain Name System service operation.

4. The method according to claim 1, wherein the first end user application is a web browser application.

5. The method according to claim 4, further comprising storing the web browser application on the computer system in an encrypted form and decrypting the web browser application prior to being executed on the trusted secure desktop.

6. The method according to claim 4, further comprising defining a landing page of the web browser application to be a predefined site.

7. The method according to claim 3, wherein the keylogger prevention service operation comprises:

temporarily breaking all connections between an operating system of the computer system and a plurality of first keyboard device drivers of the computer system; and

establishing a connection between the operating system and a second keyboard device driver that has been verified to be an unpatched or untampered device driver.

8. The method according to claim 7, wherein the keylogger prevention service operation further comprises:

intercepting at least one function used to patch memory images of the second keyboard device driver; and

preventing the function from succeeding if the function is determined to be used by malware.

9. The method according to claim 3, wherein the code injection prevention service operation comprises:

monitoring a plurality of code injection functions being performed by the computer system; and

preventing at least one code injection function of the plurality of code injection functions from succeeding if the code injection function is determined to be used by malware.

10. The method according to claim 3, wherein the screen scraper protection service operation comprises:

monitoring a plurality of functions performed by the computer system used to intercept or redirect information communicated to and from a keyboard, a mouse, and a display screen;

intercepting the plurality of functions; and

preventing at least one function of the plurality of functions from succeeding if the function is a non-display screen function and is determined to be used by malware or at least one second end-user application running on the unsecure desktop.

11. The method according to claim 3, wherein the screen scarper protection service operation comprises:

monitoring a plurality of functions performed by the computer system used to intercept or redirect information communicated to and from a keyboard, a mouse, and a display screen;

intercepting the plurality of functions; and

performing the function against a screen size of a height of zero pixels and a width of zero pixels if the function is a display screen function and is determined to be used by malware or at least one second end-user application running on the unsecure desktop.

12. The method according to claim 1, further comprising

scanning program data stored in a memory device of the computer system associated with a plurality of user mode and kernel mode applications running on the unsecure desktop for malware prior to launching the trusted secure desktop and the first end user application;

and

preventing at least one of the trusted secure desktop and the first end user application from launching if the program data includes the malware.

13. The method according to claim 12, further comprising

running an anti-virus/spyware software installed on the computer system to identify and remove the malware from the computer system;

and

allowing the trusted secure desktop and the first end user application to be launched subsequent to the removal of the malware from the computer system.

14. The method according to claim 3, wherein the Domain Name System service operation comprises:

generating a DNS resolution request at the computer system;

communicating the DNS resolution request from the computer system to a DNS server computer system for translation of a domain name for a network site to a numerical identifier; and

receiving the numerical identifier at the computer system.

15. A computer system, comprising:

a computer readable medium having a plurality of instructions stored thereon; and

at least one processing device communicatively coupled to the computer readable medium and configured for executing the plurality of instructions that cause the computer system to (a) execute a trusted secure desktop simultaneously with an unsecure desktop, (b) execute a first end user application on the trusted secure desktop, and (c) perform at least one security service operation to protect the first end user application against malware.

16. The computer system according to claim 15, wherein the security service operation is performed by the trusted secure desktop and an underlying security software including a user mode software configured to communicate with the trusted secure desktop and a kernel mode software configured to communicate with the user mode software and an operating system of the computer system.

17. The computer system according to claim 15, wherein the security service operation is selected from the group consisting of a keylogger prevention service operation, a code injection prevention service operation, a screen scraper protection service operation, a process termination prevention service operation, and a Domain Name System (DNS) service operation.

18. The computer system according to claim 15, wherein the first end user application is a web browser application.

19. The computer system according to claim 18, wherein the web browser application is stored on the computer readable medium in an encrypted format, and the processing device is further configured for decrypting the web browser application prior to being executed on the first desktop.

20. The computer system according to claim 17, wherein the keylogger prevention service operation comprises

temporarily breaking all connections between an operating system of the computer system and a plurality of first keyboard device drivers of the computer system, and

establishing a connection between the operating system and a second keyboard device driver that has been verified to be an unpatched or untampered device driver.

21. The computer system according to claim 20, wherein the keylogger prevention service operation further comprises

intercepting at least one function used to patch memory images of the second keyboard device driver, and

preventing the function from succeeding if the function is being used by malware.

22. The computer system according to claim 17, wherein the code injection prevention operation comprises

monitoring a plurality of code injection functions being performed by the computer system, and

preventing at least one code injection function of the plurality of code injection functions from succeeding if the code injection function is being used by malware.

23. The computer system according to claim 17, wherein the screen scraper protection operation comprises

monitoring a plurality of functions performed by the computer system used to intercept or redirect information communicated to and from a keyboard, a mouse, and a display screen,

intercepting the plurality of functions, and

preventing at least one function of the plurality of functions from succeeding if the function is a non-display screen function and is being used by malware or at least one second end-user application running on the unsecure desktop.

24. The computer system according to claim 17, wherein the screen scraper protection operation comprises

monitoring a plurality of functions performed by the computer system used to intercept or redirect information communicated to and from a keyboard, a mouse, and a display screen,

intercepting the plurality of functions, and

performing the function against a screen size of a height of zero pixels and a width of zero pixels if the function is a display screen function and is being used by malware or at least one second end-user application running on the unsecure desktop.

25. The computer system according to claim 15, wherein the processing device is further configured for

scanning program data stored in the computer system associated with a plurality of user mode and kernel mode applications running on the unsecure desktop for malware prior to launching the trusted secure desktop and the first end user application;

and

preventing at least one of the trusted secure desktop and the first end user application from launching if the program data includes the malware.

26. The computer system according to claim 25, wherein the processing device is further configured for

running an anti-virus/spyware software to identify and remove the malware from the computer system, and

allowing the trusted secure desktop and the first end user application to be launched subsequent to the removal of the malware from the computer system.