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03 Jul Goodbye GoogleUpdate.exe http://tinyurl.com/m9unfr

03 Jul New photo: Yellow Poppy http://tinyurl.com/mvtnz3

03 Jul F-Secure blog: Bait Files http://tinyurl.com/lrw8y5

03 Jul MS antispyware blog: An update from FIRST and what we can learn from the Nijō Castle http://tinyurl.com/mmnpyy

02 Jul F-Secure blog: China's Dam Delay http://tinyurl.com/m2u25h

02 Jul Me and Visual Studio going to have some quality time now ;)

02 Jul May The Tweets Be With You. Biz Stone on trademarking the word "Tweet". http://bit.ly/2Ju4If

02 Jul msjv32.dll, msdos.pif and msne.exe installed in another drive-by download: http://bit.ly/PJcdw

02 Jul ReadWriteWeb: Changing Horses Midstream: The Next Big Sound Susses Out Early-Stage Changes http://tinyurl.com/n2mfxg

01 Jul F-Secure blog: Private Browsing http://tinyurl.com/lwwhzm

01 Jul mon.itor.us down?

01 Jul -4 followers today. I must be terribly boring ;)

01 Jul Spotify did not remember my password after the update.

01 Jul Invited to the Dreamhost Private Servers http://tinyurl.com/nw9eyv

01 Jul Malware honeypot infected with rr64_b.exe, securentm.sys and 9129837.exe. http://bit.ly/PJcdw

01 Jul Following_me, Followers_me http://tinyurl.com/la5jtq

01 Jul Drinking coffee, writing some code for FreeFixer, and the malware honeypot running in the background.

23 April 2009

Porting Native API calls to Windows 7

I'm currently porting FreeFixer for the Windows 7 platform. Luckily the different flavors of Windows does not differ that much from one release to another, so most of the unit tests worked without any changes to the existing code.

There's one piece of code that needed an update though, and it's the rootkit detection plugin, which in its current state detects hidden processes. This plugin uses the Windows Native API. The Native API is incompletely documented and used internally by the Windows NT operating systems (NT, XP, 2000, Vista, Win7, etc). FreeFixer calls the Native API by putting the system calls index in the eax register, and then using sysenter or int 2Eh depending on the platform. By using this procedure, FreeFixer can bypass some of the rootkit hooking techniques that hide running processes.

There is one problem though, the system call index numbers have changed from release to release, and Windows 7 was not exception, so the code needed an update. The following lists some of the index numbers for the Windows 7 platform: 

NtQuerySystemInformation  = 0x106
NtQueryInformationProcess = 0xe4
NtReadVirtualMemory       = 0x105
NtOpenProcess             = 0xbf

Hope this helps if you are porting your Native API calls to Windows 7.

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20 February 2009

OpenProcess and Audiodg.exe

I'm currently working on getting my malware removal tool FreeFixer up and running on the Windows Vista platform. FreeFixer woks by scanning the registry and the file system to find unwanted software. It is also enumerating processes, their file names and their modules. This is were I ran into some minor problem. On Windows XP I had previously obtained the SeDebugPrivilege privilege (defined as SE_DEBUG_NAME) and then opened all processes with the OpenProcess system call and passing PROCESS_QUERY_INFORMATION | PROCESS_VM_READ as the requested access. However, on Windows Vista OpenProcess failed on Audiodg.exe, with the ERROR_ACCESS_DENIED error code.

Audiodg.exe - a protected process

Windows Vista introduced a new type of process, the protected process. Protected processes are there to enhance support for digital rights management functionality in Windows Vista. [1]

A typical protected process does not allow injecting a thread into the process, accessing virtual memory of process, debugging the process, duplicate handles of the process, changing the quota or working set of a process.
You cannot open a typical protected process with PROCESS_QUERY_INFORMATION nor PROCESS_VM_READ. Luckily Vista introduced the PROCESS_QUERY_LIMITED_INFORMATION, which is a limited version of the PROCESS_QUERY_INFORMATION access right. This will allow you to open the process with OpenProcess and at least get the full path of the protected process. I think - please correct me if I'm wrong - that it's not possible to enumerate the modules of audiodg.exe from without the help of a kernel-mode component?

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How to toggle tab size in Visual Studio using a macro

Here's a code snippet that toggles the C/C++ editor's tab size between 2, 4 and 8:

' Author: Roger Karlsson
' http://rogerkarlsson.com/blogs/programming/toggle-tab-size/
Public Module ToggleTabSize

    ' Toggle the C/C++ editor's tab size between 2, 4 and 8.
    Sub Toggle()
        Dim props As EnvDTE.Properties = DTE.Properties("TextEditor", "C/C++")
        Dim ts As EnvDTE.Property
        Dim ins As EnvDTE.Property

        ts = props.Item("TabSize")
        ins = props.Item("IndentSize")

        If ts.Value = 2 Then
            ts.Value = 4
            ins.Value = 4
        ElseIf ts.Value = 4 Then
            ts.Value = 8
            ins.Value = 8
        Else
            ts.Value = 2
            ins.Value = 2
        End If
    End Sub

End Module

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How to get the module handle in an ATL DLL

In Visual C++ 6.0 you can use _Module.m_hInst to get the module handle in an Active Template Library (ATL) DLL project. In ATL 7.0, which comes with Visual Studio 2003 and Visual Studio 2005, "_Module" has been replaced and you can use the m_hInst member in _AtlBaseModule: 



const HMODULE hLib = _AtlBaseModule.m_hInst;

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