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MBR win32\olmasco.o


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#1 littlebam

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Posted 16 August 2011 - 04:56 AM

Hi,

I'm new to this forum and to this whole process so please bear with me. I have an infection detected message from an ESET System Rescue scan, run from a USB key.
The scan reports 5 instances of an MBR infection "win32\olmasco.o". When I ask to clean them ESET reports that it has successfully cleaned them, however on performing another scan, with a reboot and without a reboot, it reports the same problem. I have tried to find details of this infection on the ESET site but have not found any.The ESET System Rescue update is from 13-08-2011.

I have tried some tools from the Kaspersky website but with no success, TDSSkiller and the kaspersky on-line scanner. Neither product detected a problem.

I believe the infection occured after downloading and running a fake copy of DiskInternals raid recovery from an e-mule search. The following day when I booted my PC it appeared normal but after a few minutes the desktop background turned black and I received numerous messages about a hard disk error, folders and desktop icons disappeared and then I received some errors relating to "attrib.exe". I don't have a detailed record of the messages.

These are the steps I took next.

I completed a system restore to a few days earlier.
I created a system rescue USB from another PC and scanned the system. It detected and cleared a number of infections, but is unable to clean this one.
I have successfully backed up my data to an external disk
I have run on-line scans from ESET & kaspersky, in normal and safe mode, nothing is detected.
I have connected the hard disk to a machine running virus vault, it fails to detect anything.

I don't know if I actually have an infection or not, however I have used the ESET System Rescue proccess previously and found it very credible.I don't wish to ignore it's findings. I would like some assistance to understand and resolve this, without the need to wipe the disk.

Edited by hamluis, 16 August 2011 - 07:29 AM.
Moved from Malware Removal Logs to Am I Infected.


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#2 quietman7

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Posted 16 August 2011 - 08:54 AM

What version of TDSSkiller did you use? Looking through the Eset Antivirus Forums that detection does appear to be a TDSS variant.

Did Eset provide a log or advise where the threats are located (full file path) at on your system?

Are you still having the same issues you did after downloading and running a fake copy of DiskInternals raid recovery from your search or did they stop and now you're just getting those detection threats?

If you're not experiencing any symptoms or signs of infection, the threats may be buried in System Restore points and that's why they continue to show. Sometimes an anti-virus can handle threat detections in System Restore, but sometimes they cannot.
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#3 littlebam

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Posted 16 August 2011 - 10:51 AM

Hi,

Many thanks for your speedy response.

The version of TDSSKiller is 2.5.15.0, dated August 11 2011, from Kaspersky Lab.

The full details of the Threat Found message is as follows, detected by ESET Sysrescue USB scan.

Name: MBR sector of the 0. physical disk.

Threat: Win32/Olmasco.O trojan

I have just attempted to complete the scan and cleaning once more and I noticed that when I select Finish, it logs the number of files scanned, the number of threats found - 5 - all identical information as above and the number of threats cleaned as 0. I'm not sure if it previously reported these as been successfully cleaned.

I don't have any of the previous symptoms occurring since I did the system restore, but continue to get the threats found using the ESET scan as mentioned earlier.

Thanks

#4 quietman7

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Posted 16 August 2011 - 11:20 AM

I recommend further investigation. Many of the tools we use in this forum are not capable of detecting (repairing/removing) all malware variants so more advanced tools are needed to investigate. Before that can be done you will need to create and post a DDS log for further investigation.

Please read the "Preparation Guide".
  • If you cannot complete a step, then skip it and continue with the next.
  • In Step 7 there are instructions for downloading and running DDS which will create a Pseudo HJT Report as part of its log.
When you have done that, post your log in the Virus, Trojan, Spyware, and Malware Removal Logs forum, NOT here, for assistance by the Malware Response Team Experts. A member of the Team will walk you through, step by step, on how to clean your computer. If you post your log back in this thread, the response from the Malware Response Team will be delayed because your post will have to be moved. This means it will fall in line behind any others posted that same day.

Start a new topic, give it a relevant title and post your log along with a brief description of your problem, a summary of any anti-malware tools you have used and a summary of any steps that you have performed on your own. An expert will analyze your log and reply with instructions advising you what to fix. After doing this, please reply back here with a link to the new topic so we can closed this one.
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#5 Orange Blossom

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Posted 16 August 2011 - 07:26 PM

Hello,

Now that you have posted a log here: http://www.bleepingcomputer.com/forums/topic414680.html you should NOT make further changes to your computer (install/uninstall programs, use special fix tools, delete files, edit the registry, etc) unless advised by a MRT Team member, nor should you ask for help elsewhere. Doing so can result in system changes which may not show in the log you already posted. Further, any modifications you make on your own may cause confusion for the helper assisting you and could complicate the malware removal process which would extend the time it takes to clean your computer.

From this point on the MRT Team should be the only members that you take advice from, until they have verified your log as clean.

Please be patient. It may take a while to get a response because the MRT Team members are EXTREMELY busy working logs posted before yours. They are volunteers who will help you out as soon as possible. Once you have made your post and are waiting, please DO NOT make another reply until it has been responded to by a member of the MRT Team. Generally the staff checks the forum for postings that have 0 replies as this makes it easier for them to identify those who have not been helped. If you post another response there will be 1 reply. A team member, looking for a new log to work may assume another MRT Team member is already assisting you and not open the thread to respond.

Please be patient. It may take several days to get a response but your log will be reviewed and answered as soon as possible. I advise checking your topic once a day for responses as the e-mail notification system is unreliable.

If HelpBot replies to your topic, PLEASE follow Step One so it will report your topic to the team members.

To avoid confusion, I am closing this topic. Good luck with your log.

Orange Blossom :cherry:
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