Method and system for detecting and removing hidden pestware files
A method and system for detecting and removing a hidden pestware file is described. One illustrative embodiment detects, using direct drive access, a file on a computer storage device; determines whether the file is also detectable by the operating system by attempting to access the file using a standard file Application-Program-Interface (API) function call of the operating system; identifies the file as a potential hidden pestware file, when the file is undetectable by the operating system; confirms through an automated pestware-signature scan of the potential hidden pestware file that the potential hidden pestware file is a hidden pestware file; and removes automatically, using direct drive access, the hidden pestware file from the storage device.
1. A method for detecting a potential hidden pestware file on a storage device of a computer, the method comprising:
detecting, using direct drive access, a file on the storage device, the direct drive access bypassing a standard file Application-Program-Interface (API) function call of an operating system of the computer;
determining whether the file is detectable by the operating system by attempting to access the file using the standard file API function call of the operating system, the file being detectable by the operating system when the attempt to access the file using the standard file API function call is successful, the file being undetectable by the operating system when the attempt to access the file using the standard file API function call is unsuccessful;
identifying the file as a potential hidden pestware file, when the file is undetectable by the operating system; and
performing the following when the file has been identified as the potential hidden pestware file:
notifying a user that the file is the potential hidden pestware file;
presenting to the user an option to remove automatically the potential hidden pestware file from the storage device; and
removing, using direct drive access, the potential hidden pestware file from the storage device automatically in response to an input from the user.
2. The method of claim 1 , wherein the method is performed in conjunction with scanning a data-bearing portion of the storage device, the scanning being performed sequentially in sector order using direct drive access.
3. A system for detecting a potential hidden pestware file on a storage device of a computer, the system comprising:
a file-detection module configured to detect, using direct drive access, a file on the storage device, the direct drive access bypassing a standard file Application-Program-Interface (API) function call of an operating system of the computer;
a file-analysis module configured to determine whether the file is detectable by the operating system by attempting to access the file using the standard file API function call of the operating system, the file being detectable by the operating system when the attempt to access the file using the standard file API function call is successful, the file being undetectable by the operating system when the attempt to access the file using the standard file API function call is unsuccessful;
a file-classification module configured to flag the file as the potential hidden pestware file, when the file is undetectable by the operating system;
a notification module configured, when the file has been flagged as the potential hidden pestware file, to:
notify a user that the file has been flagged as the potential hidden pestware file; and
present to the user an option to remove automatically the potential hidden pestware file from the storage device; and
a pestware-removal module configured to remove automatically, using direct drive access, the potential hidden pestware file from the storage device in response to an input from the user.
4. The system of claim 3 , wherein the file-detection module is configured to scan a data-bearing portion of the storage device sequentially in sector order using direct drive access.
5. A non-transitory computer-readable storage medium containing program instructions executable by a processor to detect a potential hidden pestware file on a storage device of a computer, the program instructions comprising:
a first instruction segment configured to detect, using direct drive access, a file on the storage device, the direct drive access bypassing a standard file Application-Program-Interface (API) function call of an operating system of the computer;
a second instruction segment configured to determine whether the file is detectable by the operating system by attempting to access the file using the standard file API function call of the operating system, the file being detectable by the operating system when the attempt to access the file using the standard file API function call is successful, the file being undetectable by the operating system when the attempt to access the file using the standard file API function call is unsuccessful;
a third instruction segment configured to flag the file as the potential hidden pestware file, when the file is undetectable by the operating system;
a fourth instruction segment configured, when the file has been flagged as the potential hidden pestware file, to:
notify a user that the file has been flagged as the potential hidden pestware file; and
present to the user an option to remove automatically the potential hidden pestware file from the storage device; and
a fifth instruction segment configured to remove automatically, using direct drive access, the hidden pestware file from the storage device in response to an input from the user.