Checking Hard Drive Size

Created the Monday 11 March 2019. Updated 1 year, 7 months ago.

Many user machines have hard drives that are larger than 80GB. A malware program can detect whether it is running in a virtual environment by checking the size of the hard drive. If the size is less than 80GB, it is likely that the program is running in a sandbox or virtual environment.

Technique Identifiers

U1312 B0009.015

Technique Tags

user machines hard drives size 80GB malware virtual environment sandbox

Code Snippets

Description

Python snippet to detect the drive size with GetDiskFreeSpaceExW

import ctypes
import math

# Convert octets
def convert_size(size_bytes):
    if size_bytes == 0:
        return "0B"
    size_name = ("B", "KB", "MB", "GB", "TB", "PB", "EB", "ZB", "YB")
    i = int(math.floor(math.log(size_bytes, 1024)))
    p = math.pow(1024, i)
    s = round(size_bytes / p, 2)
    return "%s %s" % (s, size_name[i])


# Get disk size with API GetDiskFreeSpaceExW
def disk_size(path):
    PULARGE_INTEGER = ctypes.POINTER(ctypes.c_ulonglong)
    kernel32 = ctypes.WinDLL('kernel32', use_last_error=True)
    kernel32.GetDiskFreeSpaceExW.argtypes = (ctypes.c_wchar_p,) + (PULARGE_INTEGER,) * 3

    _, total, free = ctypes.c_ulonglong(), ctypes.c_ulonglong(), ctypes.c_ulonglong()
    success = kernel32.GetDiskFreeSpaceExW(path, ctypes.byref(_), ctypes.byref(total), ctypes.byref(free))
    size = convert_size(total.value)
    print "The size of the disk is: ", size


if __name__ == '__main__':
    disk_size("C:/")

About Author Open Snippet

Author: Thomas Roccia (fr0gger) / Target Platform: Windows

Additional Resources

External Links

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