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Infected? Hardware problem? Software problem?


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#1 knismaps

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Posted 02 November 2013 - 07:18 AM

The short version of my problem is that at some point after a reboot, certain web pages fail to load.  I'm not sure what the root cause is, at all.  I am running Windows 7 SP1 and was up to date with updates when this started.

 

When it started happening:

Thursday night, the power flickered at my apartment and made my computer reboot.  I figured it was a good a time as any to install Windows updates since I hadn't done that in a while.  After doing so was when I first noticed the problem.

 

The problem:

What happens is after I reboot, at first, everything works fine.  At some time after, some web sites just don't load.  The sites that don't load are consistent (if I reboot and wait, all the same ones fail).  A couple examples are bleepingcomputer.com itself and any of Valve's (the game developer) sites.  It doesn't seem that computer help/anti-malware sites are all not working, since MBAM and AVG's sites work.  Google itself always works and when Googling for info on this problem, I seem to find more sites that don't work than do, once it starts happening.

 

I don't know specifically at what point stuff stops loading.  I tried rebooting then going to read a book for an hour, and it was working when I tried immediately after.  If I reboot and open Firefox with a ton of tabs and start browsing around, it might stop within a few minutes.

 

What I tried:

At first I thought it was my Internet connection or router, but using my phone connected to my own wifi lets me view the pages I can't on my desktop.  I don't have any other devices to test besides my phone.  So, I don't think it's my router or my ISP.

 

The same pages will fail to load in different browsers on my desktop.  So, it's not specifically Firefox, Chrome, or IE.

 

I tried using a USB wifi dongle instead of the onboard NIC I usually use, but the problem still happens.  So, it's not my NIC failing.

 

I tried using telnet to manually fetch pages but it also doesn't work (telnet www.somesite.com 80, then entering "GET / HTTP/1.1" and then "Host: www.somesite.com" but it just sits and does nothing; if I do this immediately on reboot it works as expected).

 

I tried scanning my computer with Adwcleaner, MBAM, and AVG's free scanner, but none found anything interesting.  I tried uninstalling the Windows updates in case they were related, but that didn't help.  (Although KB2884256 doesn't offer to uninstall itself.)

 

I have no idea what's up with this.  I don't know enough to rule out either malware, a software problem, or a hardware problem.  But, nothing finds evidence of malware.  I thought maybe the power flicker might have ended up frying my NIC, but the wifi dongle also didn't work.  If some other hardware was malfunctioning, I'd think the problems would be a lot less consistent and less specific than only some web pages failing to load.  Like, random crashes/blue screens/reboots if it was bad RAM/motherboard/CPU.  The only things left I can think to try are a live CD to try scanning for malware again or just reinstalling Windows.

 

Any ideas on what else I can do to check on the malware angle?



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#2 boopme

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Posted 02 November 2013 - 10:19 AM

Hello knismaps, let's see if we can find something.

Please download MiniToolBox, save it to your desktop and run it.
Checkmark the following checkboxes:
  • Flush DNS
  • Report IE Proxy Settings
  • Reset IE Proxy Settings
  • Report FF Proxy Settings
  • Reset FF Proxy Settings
  • List content of Hosts
  • List IP configuration
  • List Winsock Entries
  • List last 10 Event Viewer log
  • List Installed Programs
  • List Users, Partitions and Memory size.
  • Click Go and post the result (Result.txt). A copy of Result.txt will be saved in the same directory the tool is run.
    Note: When using "Reset FF Proxy Settings" option Firefox should be closed.



    Download TDSSKiller and save it to your desktop.
  • Extract (unzip) its contents to your desktop.
  • Open the TDSSKiller folder and doubleclick on TDSSKiller.exe to run the application, then on Start Scan.
  • If an infected file is detected, the default action will be Cure, click on Continue.
  • If a suspicious file is detected, the default action will be Skip, click on Continue.
  • It may ask you to reboot the computer to complete the process. Click on Reboot Now.
  • If no reboot is require, click on Report. A log file should appear. Please copy and paste the contents of that file here.
  • If a reboot is required, the report can also be found in your root directory (usually C:\ folder) in the form of TDSSKiller_xxxx_log.txt. Please copy and paste the contents of that file here.
  • .
    .
    .
    ADW Cleaner Skip or rerun it.

    Please download AdwCleaner by Xplode and save to your Desktop.
  • Double click on AdwCleaner.exe to run the tool
  • Click on the Scan button.
  • AdwCleaner will begin to scan your computer like it did before.
  • After the scan has finished...
    <-insert any special instructions here for what to uncheck OR remove this line if there are none->
  • This time click on the Clean button.
  • Press OK when asked to close all programs and follow the onscreen prompts.
  • Press OK again to allow AdwCleaner to restart the computer and complete the removal process.
  • After rebooting, a logfile report (AdwCleaner[S#].txt) will open automatically (where the largest value of # represents the most recent report).
  • Copy and paste the contents of that logfile in your next reply.
  • A copy of that logfile will also be saved in the C:\AdwCleaner folder.
  • .
    .
    .

    thisisujrt.gif Please download Junkware Removal Tool to your desktop.
  • Shut down your protection software now to avoid potential conflicts.
  • Run the tool by double-clicking it. If you are using Windows Vista, 7, or 8; instead of double-clicking, right-mouse click JRT.exe and select "Run as Administrator".
  • The tool will open and start scanning your system.
  • Please be patient as this can take a while to complete depending on your system's specifications.
  • On completion, a log (JRT.txt) is saved to your desktop and will automatically open.
  • Post the contents of JRT.txt into your next message.
  • Last run ESET.
  • Hold down Control and click on this link to open ESET OnlineScan in a new window.
  • Click the esetonlinebtn.png button.
  • For alternate browsers only: (Microsoft Internet Explorer users can skip these steps)
  • Click on esetsmartinstaller_enu.exe to download the ESET Smart Installer. Save it to your desktop.
  • Double click on the esetsmartinstaller_enu.png icon on your desktop.
  • Check "YES, I accept the Terms of Use."
  • Click the Start button.
  • Accept any security warnings from your browser.
  • Under scan settings, check "Scan Archives" and "Remove found threats"
  • Click Advanced settings and select the following:
  • Scan potentially unwanted applications
  • Scan for potentially unsafe applications
  • Enable Anti-Stealth technology
  • ESET will then download updates for itself, install itself, and begin scanning your computer. Please be patient as this can take some time.
  • When the scan completes, click List Threats
  • Click Export, and save the file to your desktop using a unique name, such as ESETScan. Include the contents of this report in your next reply.
  • Click the Back button.
  • Click the Finish button.
  • NOTE:Sometimes if ESET finds no infections it will not create a log.

How do I get help? Who is helping me?For the time will come when men will not put up with sound doctrine. Instead, to suit their own desires, they will gather around them a great number of teachers to say what their itching ears want to hear....Become a BleepingComputer fan: Facebook

#3 knismaps

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Posted 02 November 2013 - 10:33 PM

After running MiniToolBox and looking through the log, I ended up apparently finding my problem.  Under the IPv4 configuration section, it said my LAN adapter's MTU was set to 1500, but 1492 is definitely the highest it should be since I use PPPoE for my Internet connection.  After making that change, I haven't experienced the problem all day.  How or why the MTU was changed, I have no idea.

 

I went ahead and ran TDSSKiller, JWR, and ESET anyway just to be sure and none of them reported any issues.

 

Thanks for the help.



#4 boopme

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Posted 03 November 2013 - 05:29 PM

Thanks for letting us know!
How do I get help? Who is helping me?For the time will come when men will not put up with sound doctrine. Instead, to suit their own desires, they will gather around them a great number of teachers to say what their itching ears want to hear....Become a BleepingComputer fan: Facebook




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