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MBR wacked?


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#1 ajcstr

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Posted 30 August 2013 - 03:07 PM

I get this error on bootup:

 

"Windows NT has found only 495k of low memory.  512k of low memory is required to run Windows NT.  You my need to upgrade your computer or run a configuration program provided by the manufacturer."

 

Steps taken. ran all the dell diagnostics, including sector by sector read and verify - no errors

 

Swapped out hard drives with another laptop - error follows the hard drive so i am guessing not a hardware, bios or other such issue.

 

Created an AVG boot scan Cd and ran scan found and deleted 6 trojans (dll and exe files)

 

put drive in an enclosure and ran malwarebytes, found 9 more (trojan.ransome, trojan.zbot, backdoor.bot, trojan.downloader).  Note all malware found was in appdata and local settings directories so am i correct in thinking there is something else still in there at a lower level. 

 

Still, om bootup, i get the single cursor, then this error.  can get into BIOS setup, but not safe mode - as i say though the problem is on the drive.

 

At this point is it more wise to wipe drive and start over?  I don't think I have a XP pro cd and I was able to copy off all the data using the enclosure.

 

Running Win XP SP3


Edited by hamluis, 30 August 2013 - 03:41 PM.
Moved from XP to Am I Infected - Hamluis.


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#2 Broni

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Posted 30 August 2013 - 08:54 PM

p22002970.gif Download Security Check from here or here and save it to your Desktop.

  • Double-click SecurityCheck.exe
  • Follow the onscreen instructions inside of the black box.
  • A Notepad document should open automatically called checkup.txt; please post the contents of that document.

NOTE 1. If one of your security applications (e.g., third-party firewall) requests permission to allow DIG.EXE access the Internet, allow it to do so.
NOTE 2 SecurityCheck may produce some false warning(s), so leave the results reading to me.

p22002970.gif Please download Farbar Service Scanner (FSS) and run it on the computer with the issue.
  • Make sure the following options are checked:
    • Internet Services
    • Windows Firewall
    • System Restore
    • Security Center/Action Center
    • Windows Update
    • Windows Defender
    • Other Services
  • Press "Scan".
  • It will create a log (FSS.txt) in the same directory the tool is run.
  • Please copy and paste the log to your reply.


p22002970.gif Please download MiniToolBox and run it.

Checkmark following boxes:
  • Report IE Proxy Settings
  • Report FF Proxy Settings
  • List content of Hosts
  • List IP configuration
  • List Winsock Entries
  • List last 10 Event Viewer log
  • List Installed Programs
  • List Devices (do NOT change any settings here)
  • List Users, Partitions and Memory size

Click Go and post the result.

p22002970.gif Download Malwarebytes' Anti-Malware (aka MBAM): https://www.bleepingcomputer.com/download/malwarebytes-anti-malware/ to your desktop.

* Double-click mbam-setup.exe and follow the prompts to install the program.
* At the end, be sure a checkmark is placed next to Update Malwarebytes' Anti-Malware and Launch Malwarebytes' Anti-Malware, then click Finish.
* If an update is found, it will download and install the latest version.
* Once the program has loaded, select Perform quick scan, then click Scan.
* When the scan is complete, click OK, then Show Results to view the results.
* Be sure that everything is checked, and click Remove Selected.
* When completed, a log will open in Notepad.
* Post the log back here.

Be sure to restart the computer.

The log can also be found here:
C:\Documents and Settings\Username\Application Data\Malwarebytes\Malwarebytes' Anti-Malware\Logs\log-date.txt
Or at C:\Program Files\Malwarebytes' Anti-Malware\Logs\log-date.txt

p22002970.gifDownload Malwarebytes Anti-Rootkit from HERE to your Desktop.
  • Unzip downloaded file.
  • Open the folder where the contents were unzipped and run mbar.exe
  • Follow the instructions in the wizard to update and allow the program to scan your computer for threats.
  • DO NOT click on the Cleanup button. Simply exit the program.
  • When done, please post the two logs produced they will be in the MBAR folder..... mbar-log-xxxxx.txt and system-log.txt


p22002970.gif Please download Rkill (courtesy of BleepingComputer.com) to your desktop.
There are 2 different versions. If one of them won't run then download and try to run the other one.
You only need to get one of these to run, not all of them. You may get warnings from your antivirus about this tool, ignore them or shutdown your antivirus.

rKill.exe: http://www.bleepingcomputer.com/download/rkill/dl/10/
iExplore.exe (renamed rKill.exe): http://www.bleepingcomputer.com/download/rkill/dl/11/

  • Double-click on the Rkill desktop icon to run the tool.
  • If using Vista or Windows 7 right-click on it and choose Run As Administrator.
  • A black DOS box will briefly flash and then disappear. This is normal and indicates the tool ran successfully.
  • If not, delete the file, then download and use the one provided in Link 2.
  • Do not reboot until instructed.
  • If the tool does not run from any of the links provided, please let me know.


If normal mode still doesn't work, run the tool from safe mode.

When the scan is done Notepad will open with rKill log.
Post it in your next reply.

NOTE. rKill.txt log will also be present on your desktop.

NOTE Do NOT wrap your logs in "quote" or "code" brackets.


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#3 ajcstr

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Posted 31 August 2013 - 09:13 AM

Note - I have no desktop, I have nothing, not even safe mode.  On boot I get a cursor, then the error message.  Any diagnostics will have to be run from a CD that I can boot from.



#4 Broni

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Posted 31 August 2013 - 10:27 AM

In that case...

 

I'll report this topic to appropriate helpers.

Hold on there....


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#5 ajcstr

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Posted 04 September 2013 - 02:53 PM

Any suggestions?



#6 halo_t

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Posted 04 September 2013 - 03:16 PM

ajcstr,

I just ran into this problem last night and fixed today on a  DELL Precision T3500

 

1.  I booted into Mini Windows XP using Hiren's boot disk.

2.  I plugged in a USB with TDSS Killer on it.

3.  Ran TDSS and it instantly found   Rootkit.Boot.Cidox.b

 

After this the computer booted normally and I ran all of the scans listed above by Broni

 

Good Luck to you sir!


Edited by halo_t, 04 September 2013 - 03:21 PM.


#7 ajcstr

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Posted 05 September 2013 - 08:36 AM

SH*T YEAH !!!!!

 

Thank you - exact same Rootkit !!

 

Worked like a charm!

 

PS - was there anything else you needed to do after this, I need to get this laptop back to its owner.


Edited by ajcstr, 05 September 2013 - 08:40 AM.


#8 halo_t

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Posted 05 September 2013 - 10:24 AM

That's great!!!!!

 

I just went through the normal malware removal routine afterwards

 

Rkill

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MalwareBytes

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#9 Elise

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Posted 07 September 2013 - 10:08 AM

Hello ajcstr,

In case you need any further assistance making sure the machine is clean, please let me know.


regards, Elise


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#10 ajcstr

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Posted 09 September 2013 - 08:58 AM

Thanks, I think I am ok now, all subsequent scans came back clean



#11 Elise

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Posted 09 September 2013 - 09:12 AM

I'm glad to hear that, happy computing. :)


regards, Elise


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#12 shashman

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Posted 25 July 2014 - 05:08 PM

Halo_T,  can you tell me step by step what you did, where did you get the hirens boot cd



#13 xXToffeeXx

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Posted 26 July 2014 - 06:37 AM

Halo_T,  can you tell me step by step what you did, where did you get the hirens boot cd

If you have a malware problem, please create your own topic detailing what the problem is. Every computer is different and so different steps may need to be taken to someone else.


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#14 bludgard

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Posted 11 December 2014 - 11:36 PM

ajcstr,

I just ran into this problem last night and fixed today on a  DELL Precision T3500

 

1.  I booted into Mini Windows XP using Hiren's boot disk.

2.  I plugged in a USB with TDSS Killer on it.

3.  Ran TDSS and it instantly found   Rootkit.Boot.Cidox.b

 

After this the computer booted normally and I ran all of the scans listed above by Broni

 

Good Luck to you sir!

Old thread but still valid. I found this searching "Windows NT has found only ***k of low memory.*"

Client has encryption-infection (forget about that, she says), but needed to get PC booted again. Worked a charm.

 

Rootkit.Boot.Cidox.b

 

imagine that....

Thanks OP and halo_t.

Always sayin': BC is the best.

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Edited by bludgard, 12 December 2014 - 12:42 PM.





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