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MWBAM finds trojan in 'Host' file every few scans--new threat or same one back?


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#1 hexe

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Posted 19 September 2014 - 05:01 PM

The basic background: Still using XP Pro on a desktop custom-built in 2007 by an IT-tech friend who now lives on the other side of the country from me, so I don't like to bother him too often with this sort of stuff. Have W7, but am loathe to do a clean install and wipe XP off the desktop unit, b/c I've got a bunch of old software installed that I do still use simply because I don't need anything newer to accomplish what I ask of it: I don't stream movies or music, I don't watch TV on the computer, don't upload photos to an on-line album, don't have my own website, don't game, don't really even do social media, for the most part. Visit websites & download email [both web-based as well as with an older stand-alone email program] several times daily; stop in from time to time to some communities [one for tractor owners, for example, and another for owners of Subaru cars, and now this one] to see what the latest buzz or discovery is, answer a question if I'm well-informed sufficiently to do so, and to solicit help [or at least sympathy] when I'm having a problem of my own with the subject of the community's collective interest. Check the news & weather, search for academic papers and reports, that sort of thing.
 
Using ESET Smart Security 7, Malwarebytes Premium v2.0.2.1012, Spybot S&D free edition v2.2.  All are kept updated via autoupdates, all run complete scans on the regular.
 
Am sure that there's stuff awry with this machine in various capacities as far as settings, configuration, etc. that have occured over the years since it was built, as it loads much slower than it used to and I do occasionally get some kind of an error message referring to parameters when I do certain things like uninstall something I didn't like or that was loaded with something I did want, but haven't pursued that because it didn't seem to interfere with what I was doing with the machine.
 
What brings me here today, as a newly joined member:
 
Have noticed that every few weeks, my Malwarebytes scan ID's a trojan in the Windows "Host" file, which I of course direct it to clean up via quarantine. A week or so goes by, and another scan, another trojan ID'd in the same file. Tried turning off the system restore before having the program deal with the trojan, but that didn't seem to make any difference--still get the same news from MWBAM every couple of scans. Can't figure out if this is the same agent which is being reloaded, a new agent with just a general description, or if this is the same one that just keeps resurfacing and dodging MWBAM's efforts to keep it contained and/or destroyed. Just happened again today.  Thoughts, suggestions? Not sure what would be best provided as far as scan results--not sure if posting report would be better than uploading a file, from a safety point of view.
 
Have posted an intro in the appropriate location, if that is of any interest.

Edit: Moved topic from Windows XP to the more appropriate forum.~ Animal

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#2 Broni

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Posted 21 September 2014 - 10:10 PM

Welcome aboard p22002758.gif

 

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.
NOTE 3. If you receive UNSUPPORTED OPERATING SYSTEM! ABORTED! message restart computer and Security Check should run

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
  • List Restore Points

Click Go and post the result.

p22002970.gif Please download Malwarebytes Anti-Malware to your desktop.
NOTE. If you already have MBAM 2.0 installed scroll down.

  • Double-click mb3-setup-1878.1878-3.5.1.2522.exe and follow the prompts to install the program.
  • At the end, be sure a checkmark is placed next to the following:

    • Launch Malwarebytes Anti-Malware
    • A 14 day trial of the Premium features is pre-selected. You may deselect this if you wish, and it will not diminish the scanning and removal capabilities of the program.

  • Click Finish.
  • On the Dashboard, click the 'Update Now >>' link
  • After the update completes, click the 'Scan Now >>' button.
  • Or, on the Dashboard, click the Scan Now >> button.
  • If an update is available, click the Update Now button.
  • A Threat Scan will begin.
  • When the scan is complete, if there have been detections, click Apply Actions to allow MBAM to clean what was detected.
  • In most cases, a restart will be required.
  • Wait for the prompt to restart the computer to appear, then click on Yes.



If you already have MBAM 2.0 installed:

  • On the Dashboard, click the 'Update Now >>' link
  • After the update completes, click the 'Scan Now >>' button.
  • Or, on the Dashboard, click the Scan Now >> button.
  • If an update is available, click the Update Now button.
  • A Threat Scan will begin.
  • When the scan is complete, if there have been detections, click Apply Actions to allow MBAM to clean what was detected.
  • In most cases, a restart will be required.
  • Wait for the prompt to restart the computer to appear, then click on Yes.


How to get logs:
(Export log to save as txt)


  • After the restart once you are back at your desktop, open MBAM once more.
  • Click on the History tab > Application Logs.
  • Double click on the Scan Log which shows the Date and time of the scan just performed.
  • Click 'Export'.
  • Click 'Text file (*.txt)'
  • In the Save File dialog box which appears, click on Desktop.
  • In the File name: box type a name for your scan log.
  • A message box named 'File Saved' should appear stating "Your file has been successfully exported".
  • Click Ok
  • Attach that saved log to your next reply.



(Copy to clipboard for pasting into forum replies or tickets)

  • After the restart once you are back at your desktop, open MBAM once more.
  • Click on the History tab > Application Logs.
  • Double click on the scan log which shows the Date and time of the scan just performed.
  • Click 'Copy to Clipboard'
  • Paste the contents of the clipboard into your reply.


p22002970.gifDownload 51a5f31352b88-icon_MBAR.pngMalwarebytes Anti-Rootkit to your desktop.
  • Warning! Malwarebytes Anti-Rootkit needs to be run from an account with administrator rights.
  • Double click on downloaded file. OK self extracting prompt.
  • MBAR will start. Click "Next" to continue.
  • Click in the following screen "Update" to obtain the latest malware definitions.
  • Once the update is complete select "Next" and click "Scan".
  • When the scan is finished and no malware has been found select "Exit".
  • If malware was detected, make sure to check all the items and click "Cleanup". Reboot your computer.
  • Open the MBAR folder located on your Desktop and paste the content of the following files in your next reply:
  • "mbar-log-{date} (xx-xx-xx).txt"
  • "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.
Do NOT use spoilers.
Do NOT edit your reply to post additional logs. Create new reply. I'll not get any email notifications about edits so I won't know you posted something new.


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