I rebooted the PC into Safe Mode and enabled all the services.
When I attempt to run sfc /scannow I get the following error
"The specific error code is 0x000006ba [The RPC Server is Unavailable]
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Page Fault in nonpaged area at xp boot
stop: 0x00000050 (0xf8727096, 0x00000000, ox805de701, 0x000000)
Occurs very early in the boot process. Boots fine into safe mode.
Dell Latitude D610 1.60Ghz, 512k RAM
System was infected with some type of malware that started a large number (dozens) of processes that all started with _A00f100xxx,exe, which literally brought the machine to it's knees.
Steps taken:
Booted into Safe Mode.
Ran ComboFix which deleted all the .dat files associated with the _A000f100xxx.exe problem and indicated grpconv.exe and proquota.exe were infected and deleted. However ComboFix appreared to have stalled in Stage 34. It sat there for like 4 hours.
Rebooted into Safe Mode.
Ran Rootkit Revealer. No Root Kits detected.
Ran HiJack This. Nothing unusual found.
Booted PC into normal mode and PC appeared to boot normally.
I was concerned that ComboFix had not completed so I decided to run it again and let it run over night.
When I came downstairs this morning I had the BSOD with the Page Fault Error.
Tried to reboot several times with the same results.
Rebooted into Safe Mode.
Used MSCONFIG to disable all services and startup items.
Rebooted and it crashed again.
Tried to boot from CDROM but fault occured before it could boot.
Ran onboard diagnostics with no problems found.
Did a search on support.microsoft.com, no information found for these stop codes.
I'm out of ideas to try to recover this PC.
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Answers
>> "The specific error code is 0x000006ba [The RPC Server is Unavailable]
http://support.microsoft.c
If re-imaging this machine is an option then you should seriously consider doing this. A machine that has been malware infected can never truely be trusted again and unless you have a serious reason not to I'd strongly suggest backing up all important data and performing a clean reinstall.
>> I should know this, but can I do a reinstall from safe mode?
You're probably best off booting from your Windows installation media (to ensure no malware is still potentially in memory) and taking it from there... as part of the installation process you should allow Windows to perform a full reformat your drive. Don't forget to back up your data first and be sure you have all the device driver media to hand that you'll need to get the machine back up and running (or at the very least nerwork drivers so you can download the other drivers you need from the Interweb.
BTW: This is my strong suggested; however, do feel free to let this question run for a while in case someone has any better ideas. There is no compelling reason to close it unless you are happy that reimaging is the best solution for you (although if I was you it is what I would be doing).
>> However, when I changed the BIOS to boot first from CD I get the page fault before windows ever starts.
You mean before the login screen, but surely after Window's has started loading... a page fault is a windows error.
>> This is NOT good!
No, this is why I suspect reimaging is really your own solution. You could try and in-place repair but after a malware infestation it is safer to just cut your losses and reimage.
Yes, definitely before the log in screen. When booting in normal mode the fault occurs shortly after the windows splash screen. This is the most frustrating problem I've encountered. I'm a fan of Ubuntu, but again, this is not my computer. I'm just trying to help and I'm not sure this user is ready for Ubuntu.
i would start by testing ram and disk, to be sure about the basiccs...
download ubcd : http://www.ultimatebootcd.
and run memtest86+ and the disk diag needed
OK, so I decided to bite the bullet and reinstall XP, but things got stranger from there.
What makes this problem so interesting is that the environment kept changing. When I initially put the XP CD in the drive and tried to use Windows Explorer to view the contents I get an error message that "the disk was unreadable and was probably not formatted" So I thought maybe there is some sort of hardware issue lurking here. So I decided to look at Device Manager and look for any device problems, When I opened device manager it was blank!
So I reset BIOS to boot from CDROM and it actually started loading files, so I thought I was over the hump, until I came back a few minutes later I saw a BSOD!
So I rebooted again into Safe Mode and reopened Device Manager and everything was there. If you look at the attached screen shot you'll see two very strange ESET miniport entries in the Network Adapters tree. I disabled them and the machine booted fime!
When I tried to uninstall them I got a message that that could not be uninstalled as they may be needed to boot the computer!
I use ESET on my own network and have never seen this occur before!
So the PC is working just in time for my client to take it on a business trip, and we'll more fully remediated the problem when she returns.
If anyone can shed any addition light on this one I would sure appreciated it, and thanks for your help.
An aside for the site admin: Why do you allow .txt and .doc files to be uploaded and not .rtf?
MikeO
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by: evilrixPosted on 2009-05-30 at 11:28:50ID: 24509842
The mailware infection and subsequent fix might have left a system file in a damaged state, you can use System File Checker to try and resolve this.
http://support.microsoft.c
System File Checker gives an administrator the ability to scan all protected files to verify their versions. If System File Checker discovers that a protected file has been overwritten, it retrieves the correct version of the file from the cache folder (%Systemroot%\System32\Dll
System File Checker Tool Syntax
Sfc [/Scannow] [/Scanonce] [/Scanboot] [/Revert] [/Purgecache] [/Cachesize=x]
* /Scannow: Scans all protected system files immediately and replaces incorrect versions with correct Microsoft versions. This command may require access to the Windows installation source files.
* /Scanonce: Scans all protected system files one time when you restart your computer. This command may require access to the Windows installation source files when you restart the computer. The SfcScan DWORD value is set to 2 in the following registry key when you run this command:
HKEY_LOCAL_MACHINE\SOFTWAR
* /Scanboot: Scans all protected system files every time you start your computer. This command may require access to the Windows installation source files every time you start your computer. The SfcScan DWORD value is set to 1 in the following registry key when you run this command:
HKEY_LOCAL_MACHINE\SOFTWAR
* /Revert: Returns scan to the default setting (do not scan protected files when you start the computer).The default cache size is not reset when you run this command. This command is equivalent to the /Enable switch in Windows 2000.
* /Purgecache: Purges the file cache and scans all protected system files immediately. This command may require access to the Windows installation source files.
* /Cachesize=x: Sets the file cache size to x megabytes (MB). The default size of the cache is 50 MB. This command requires you to restart the computer, and then run the /purgecache command to adjust the size of the on-disk cache. This command sets the SfcQuota DWORD value to x in the following registry key:
HKEY_LOCAL_MACHINE\SOFTWAR