csrss.exe infected with trojan

Symantec Endpoint has indicated that the csrss.exe on a server is infected with a trojan anti virus.  Symantec seemed to have quaranteened it once, but it is back.

Can this file be replaced?  If so, how would one take it out of service to replace it?
WilfAsked:
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Gerwin Jansen, EE MVETopic Advisor Commented:
What is the trojan and where is the csrss.exe located? Trojans often copy themselves as a normal filename to a different location.
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WilfAuthor Commented:
The locaction is WINDOWS\mui\csrss.exe and the trojan is Trojan.Dropper
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Russell_VenableCommented:
Hi wilf_thorburn,
I have requested that this question be added to the antivirus section as well. The "csrss" program is by default located in the system32 directory.
C:\Windows\system32\csrss.exe

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You say it is located here:
C:\Windows\mui\csrss.exe

Open in new window

Do you mean csrss.exe or csrss.exe.mui? Can you give a picture of the infection window that better describes the virus or even better a link that Symantec End Point gives you to explain the infection?
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WilfAuthor Commented:
Here is a segment of the report from Endpoint symantec-rep.pdf
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Russell_VenableCommented:
I never did like how symantec never gives you real detailed information about what is finds. That and the fact the time dates for the file it found in the report you gave are bogus. This doesn't help much. Have you isolated this computer and ran a copy of malwarebytes? To get a second opinion?
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WilfAuthor Commented:
I cannot get to the computer til the weekend but will do that then.  Is the mui directory for real?
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Russell_VenableCommented:
Yes, The MUI(Multilingual User Interface) directory is used to store multilingual support for different languages on the so named software. I am not sure if I will be at desktop on the weekend. However I will be have my phone.
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davetorresCommented:
I would be more worried about why it keeps getting infected. Please consider that the result is a false positive.
Does Symantec have the option to submit suspicious files for analysis?
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Russell_VenableCommented:
Yes, it does. It's not false positive either. The csrss is a dropper which downloads other items to the system. Problem is we don't know kind of malware this dropper is.
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WilfAuthor Commented:
I ran malwarebytes.  I have had the program remove the first two items in the temp folder.  I did not remove C:\WINDOWS\ime\lsass.exe because earlier I ran End Point Sep_SupportTool.exe, and it suggested the lsass was suspect.  I removed it, and then the server came up with a device allready exists error, and would reboot.  I was able to restore the deletion with the symantec tool, but was not sure if I could with malwarebytes  if the same reaction occurred.  I will run the longer test and post the log from it also.
mbam-log-2011-12-30--23-40-30-.txt
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WilfAuthor Commented:
I have posted the malwarbytes result as a separate question.
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