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msdtc.exe and dllhost.exe


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4 replies to this topic

#1 AlchemicEND

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Posted 08 October 2012 - 01:15 PM

The other day my brother hooked up his i phone to the computer an I noticed 2 things in task manager I hadn't seen before.

msdtc.exe and dllhost.exe *They don't reappear on reboot.*

I ran 4 different scans on my computer but none of them found anything bad just some cookies. Was this just the phone trying to sync up with our computer or is there something I need to worry about. Forgot to mention he also hooked up his other phone it was an LG something not sure on the full name, but it wouldn't ever connect to pc, not sure exactly which phone these 2 processes came from. Hopefully someone can help put my mind at ease.

OS: Windows XP Home Edition


---I think I posted this in the wrong forums by accident sorry. Was just so worried I couldn't really event think straight when posting.

Edited by AlchemicEND, 08 October 2012 - 01:18 PM.


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#2 Didier Stevens

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Posted 09 October 2012 - 04:19 AM

msdtc.exe and dllhost.exe are valid Windows components.

I have no idea why the Distributed Transaction Coordinator (msdtc) is needed for an iPhone. Do you have iTunes your machine?

If you want to be sure that msdtc.exe and dllhost.exe have not been altered, check the digital signature. You'll need to use Sysinternals' sigcheck for this.

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#3 AlchemicEND

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Posted 09 October 2012 - 09:33 AM

I used the windows search feature to search my computer an here are the files it found with those names.

dllhost C:\WINDOWS\$NtServicePackUninstall$
DLLHOST.EXE-1ECB6754.pf C:\WINDOWS\Prefetch
dllhost C:\WINDOWS\system32
dllhost C:\WINDOWS\ServicePackFiles\i386

msdtc C:\WINDOWS\$NtServicePackUninstall$
MSDTC.EXE-0E6E4AF7.pf C:\WINDOWS\Prefetch
msdtc C:\WINDOWS\system32
msdtc C:\WINDOWS\ServicePackFiles\i386

I uploaded each of those files to VirusTotal.com an they all came back clean.

We don't have iTunes on our computer, is it possible that msdtc was just trying to find iTunes on our PC and connect to it?

#4 Didier Stevens

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Posted 10 October 2012 - 03:56 AM

We don't have iTunes on our computer, is it possible that msdtc was just trying to find iTunes on our PC and connect to it?


No, seems unlikely to me. MSDTC is a Windows component I know from my professional activities. It coordinates transactions when several databases are involved.

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#5 quietman7

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Posted 11 October 2012 - 06:24 AM

I noticed 2 things in task manager I hadn't seen before.

Most of the processes in Windows Task Manager will be legitimate but it does not provide enough information. These are tools to investigate running processes, programs that run at startup, services and gather additional information to identify them or resolve problems:These tools will provide information about each process, CPU usage, file description and its path location. Most of them are stand-alone apps in a zip file so no installation is necessary.

Anytime you come across a suspicious file or one that you do not recognize, search the name using Google <- click here for an example.
-- CAUTION: When looking at the search results, be aware many sites may provide bogus information about a file name and claim it is malware or related to a registry error in order to get you to download or buy a program to fix it.

Or search the following databases:If you cannot find any information, the file has a legitimate name but is not located where it is supposed to be, or you want a second opinion, submit it to one of the following online services that analyzes suspicious files:In the "File to Scan" (Upload or Submit) box, browse to the location of the suspicious file(s) and submit (upload) it for scanning/analysis. If you get a message saying "File has already been analyzed", click Reanalyze or Scan again.
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