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armadito-windows-driver's Issues

Malware with pure UTF-16 characters in the filename can bypass detection

Files with names containing pure UTF-16 characters can bypass detection. The user-mode service will fail to open the file for scanning after the conversion is done to ANSI, because characters that cannot be converted from Unicode are replaced with '?'.

armadito-windows-driver/src/communication.c

Lines 255 to 263 in 06c8260

// Convert unicode string to ansi string for ring 3 process.
ntStatus = RtlUnicodeStringToAnsiString(&AnsiString, (PCUNICODE_STRING)FilePath, TRUE);
if(!NT_SUCCESS(ntStatus)){
DbgPrint("[-] Error :: ArmaditoGuard!SendScanOrder :: RtlUnicodeStringToAnsiString() routine failed !! \n");
__leave;
}
// Fill the SCAN_MESSAGE_CONTEXT struct.
RtlCopyMemory(&(scanMessage->FileName), AnsiString.Buffer, AnsiString.Length);

Below is an image demonstrating the bug. In the first case, the filename is in Arabic and in the second, the filename's first letter is the greek M (U+039C).

image
A fix would require a re-implementation of the parts of the service dealing with filenames to make them support Unicode.

DriverVer error when building ArmaditoGuard Package

Signability test failed.
22.9.6 : DriverVer missing or in incorrect format in \armaditoguard.inf
Setting DriverVer variable in ArmaditoGuard.inf temporarily fixes the problem :
DriverVer=06/14/2016,1.0.0.0

It does not work the same on each system.

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