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csrss.exe infection?

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Hi, I've been doing a bit of digging since I received my laptop back about a month or so ago.  I noticed that I suddenly had trouble staying connected to the internet. I assumed it was a virus, but the issue was so terrible that nothing could run. 

Recently, I've noticed my Disk Usage had been at 100%.  I did a fix on that to no avail only to see the spikes continue to happen.  I checked my process and found csrss.exe.  Now I know I can't just get rid of it, but in my details I have two of that process running. One of them is just devoring the disk usage. I can't tell if this is normal or infected.

The difference is just huge:

                                    I/O reads      I/Oread
1.   csrss.exe                304,460         8MIL

2.   csrss.exe                  527             300K


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Hi there,
my name is Marius and I will assist you with your malware related problems.

Before we move on, please read the following points carefully.

  • First, read my instructions completely. If there is anything that you do not understand kindly ask before proceeding.
  • Perform everything in the correct order. Sometimes one step requires the previous one.
  • If you have any problems while following my instructions, Stop there and tell me the exact nature of your problem.
  • Do not run any other scans without instruction or add/remove software unless I tell you to do so. This would change the output of our tools and could be confusing for me.
  • Post all logfiles as a reply rather than as an attachment unless I specifically ask you. If you can not post all logfiles in one reply, feel free to use more posts.
  • If I don't hear from you within 3 days from this initial or any subsequent post, then this thread will be closed.
  • Stay with me. I will give you some advice about prevention after the cleanup process. Absence of symptoms does not always mean the computer is clean.
  • My first language is not english. So please do not use slang or idioms. It could be hard for me to read. Thanks for your understanding.

Hi there,
the file itself is safe and normally part of windows. Sometimes it is misused by malware. Let´s see:
Scan with FRST in normal mode

Please download Farbar's Recovery Scan Tool to your desktop: FRST 32bit or FRST 64bit (If not sure: Start --> Computer (right click) --> properties)

  • Run FRST.
  • Don´t change one of the checkboxes and hit Scan.
  • Logfiles are created on your desktop.
  • Poste the FRST.txt and (after the first scan only!) the Addition.txt.




Scan with Gmer rootkit scanner

Please download Gmer from here by clicking on the "Download EXE" Button.

  • Double click on the randomly named GMER.exe. If asked to allow gmer.sys driver to load, please consent.
  • If it gives you a warning about rootkit activity and asks if you want to run scan...click on NO.
  • In the right panel, you will see several boxes that have been checked. Uncheck the following ...
    • Sections
    • IAT/EAT
    • Show All ( should be unchecked by default )

    [*]Leave everything else as it is. [*]Close all other running programs as well as your Browser. [*]Click the Scan button & wait for it to finish. [*]Once done click on the Save.. button, and in the File name area, type in "ark.txt" or it will save as a .log file which cannot be uploaded to your post. [*]Save it where you can easily find it, such as your desktop. [*]Please post the content of the ark.txt here.

Rootkit scans often produce false positives. Do NOT take any action on any "<--- ROOKIT" entries

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skip gmer:



Scan with aswMBR

Please download aswMBR ( 4.5MB ) to your desktop.

  • Double click the aswMBR.exe icon, and click Run.
  • There will be a short delay before the next dialog box comes up. Please just wait a minute or two.
  • When asked if you'd like to "download the latest Avast! virus definitions", click Yes.
  • Typically this is about a 100MB download so depending on your connection speed it can take a short while to download and become ready.
  • Click the Scan button to start the scan once the update has finished downloading
  • On completion of the scan, click the save log button, save it to your desktop, then copy and paste it in your next reply.

Note: There will also be a file on your desktop named MBR.dat do not delete this for now. It is an actual backup of the MBR (master boot record).

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Alright, this one worked.

aswMBR version Copyright© 2011 AVAST Software
Run date: 2014-02-20 09:24:10
09:24:10.325    OS Version: Windows x64 6.2.9200
09:24:10.325    Number of processors: 4 586 0x4501
09:24:10.325    ComputerName: HALL  UserName:
09:24:10.325    Initialze error 1
09:24:25.825    AVAST engine defs: 14022000
09:24:28.497    Disk 0 (boot) \Device\Harddisk0\DR0 -> \Device\00000042
09:24:28.497    Disk 0 Vendor: ST1000LM024_HN-M101MBB 2AR20002 Size: 953869MB BusType: 11
09:24:28.512    Disk 0 MBR read successfully
09:24:28.512    Disk 0 MBR scan
09:24:28.512    Disk 0 unknown MBR code
09:24:28.528    Disk 0 Partition 1 00     EE          GPT           2097151 MB offset 1
09:24:28.528    Disk 0 scanning C:\Windows\system32\drivers
09:24:28.528    Service scanning
09:24:29.200    Modules scanning
09:24:29.200    Disk 0 trace - called modules:
09:24:29.200    ntoskrnl.exe CLASSPNP.SYS disk.sys ACPI.sys storport.sys hal.dll iaStorA.sys
09:24:29.216    1 nt!IofCallDriver -> \Device\Harddisk0\DR0[0xfffffa8007b07060]
09:24:29.216    3 CLASSPNP.SYS[fffff88000afde0a] -> nt!IofCallDriver -> [0xfffffa80075ddc00]
09:24:29.216    5 ACPI.sys[fffff88000e48a91] -> nt!IofCallDriver -> [0xfffffa80069bc3a0]
09:24:29.216    7 ACPI.sys[fffff88000e48a91] -> nt!IofCallDriver -> \Device\00000042[0xfffffa80075dd060]
09:24:29.216    AVAST engine scan C:\Windows
09:24:29.216    AVAST engine scan C:\Windows\system32
09:24:29.231    AVAST engine scan C:\Windows\system32\drivers
09:24:29.231    AVAST engine scan C:\Users\Asatsuya
09:24:29.231    AVAST engine scan C:\ProgramData
09:24:29.231    Scan finished successfully
09:24:49.265    Disk 0 MBR has been saved successfully to "C:\Users\Asatsuya\Desktop\MBR.dat"
09:24:49.265    The log file has been saved successfully to "C:\Users\Asatsuya\Desktop\aswMBR.txt"

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looks good


Delete junk with adwCleaner

Please download AdwCleaner to your desktop.

  • Run adwcleaner.exe
  • Hit Scan and wait for the scan to finish.
  • Confirm the message but don´t uncheck anything.
  • Hit Clean
  • When the run is finished, it will open up a text file
  • Please post its contents within your next reply
  • You´ll find the log file at C:\AdwCleaner[s1].txt also

Delete junk with JRT

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.




Scan with ESET Online Scan

Please go to here to run the online scannner from ESET.

  • Turn off the real time scanner of any existing antivirus program while performing the online scan
  • Tick the box next to YES, I accept the Terms of Use.
  • Click Start
  • When asked, allow the activex control to install
  • Click Start
  • Make sure that the option Remove found threats is unticked
  • Click on Advanced Settings and ensure these options are ticked:
    • Scan for potentially unwanted applications
  • Scan for potentially unsafe applications
  • Enable Anti-Stealth Technology

[*]Click Scan[*]Wait for the scan to finish[*]If any threats were found, click the 'List of found threats' , then click Export to text file.... [*]Save it to your desktop, then please copy and paste that log as a reply to this topic.

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# AdwCleaner v3.019 - Report created 21/02/2014 at 17:16:28
# Updated 17/02/2014 by Xplode
# Operating System : Windows 8  (64 bits)
# Username : Asatsuya - HALL
# Running from : C:\Users\Asatsuya\Desktop\adwcleaner.exe
# Option : Clean

***** [ Services ] *****

***** [ Files / Folders ] *****

Folder Deleted : C:\Program Files (x86)\MyPC Backup
Folder Deleted : C:\Windows\SysWOW64\AI_RecycleBin
Folder Deleted : C:\Users\Asatsuya\AppData\Roaming\Systweak
File Deleted : C:\Windows\System32\roboot64.exe

***** [ Shortcuts ] *****

***** [ Registry ] *****

Key Deleted : HKLM\SOFTWARE\Classes\AppID\{0A18A436-2A7A-49F3-A488-30538A2F6323}
Key Deleted : HKLM\SOFTWARE\Classes\CLSID\{007EFBDF-8A5D-4930-97CC-A4B437CBA777}
Key Deleted : HKLM\SOFTWARE\Classes\Interface\{3408AC0D-510E-4808-8F7B-6B70B1F88534}
Key Deleted : HKLM\SOFTWARE\Classes\TypeLib\{DCABB943-792E-44C4-9029-ECBEE6265AF9}
Key Deleted : HKCU\Software\Microsoft\Internet Explorer\SearchScopes\{014DB5FA-EAFB-4592-A95B-F44D3EE87FA9}
Key Deleted : [x64] HKLM\SOFTWARE\Classes\CLSID\{31D09BA0-12F5-4CCE-BE8A-2923E76605DA}
Key Deleted : [x64] HKLM\SOFTWARE\Classes\Interface\{3408AC0D-510E-4808-8F7B-6B70B1F88534}
Key Deleted : [x64] HKLM\SOFTWARE\Microsoft\Windows\CurrentVersion\Explorer\Browser Helper Objects\{31D09BA0-12F5-4CCE-BE8A-2923E76605DA}
Key Deleted : HKCU\Software\Softonic
Key Deleted : HKCU\Software\systweak
Key Deleted : HKLM\Software\caphyon
Key Deleted : HKLM\Software\systweak

***** [ Browsers ] *****

-\\ Internet Explorer v10.0.9200.16798

Setting Restored : HKCU\Software\Microsoft\Internet Explorer\Main [start Page]

-\\ Mozilla Firefox v27.0.1 (en-US)

[ File : C:\Users\Asatsuya\AppData\Roaming\Mozilla\Firefox\Profiles\reavg59u.default\prefs.js ]


AdwCleaner[R0].txt - [2258 octets] - [21/02/2014 17:14:42]
AdwCleaner[s0].txt - [1870 octets] - [21/02/2014 17:16:28]

########## EOF - C:\AdwCleaner\AdwCleaner[s0].txt - [1930 octets] ##########





Junkware Removal Tool (JRT) by Thisisu
Version: 6.1.2 (02.20.2014:1)
OS: Windows 8 x64
Ran by Asatsuya on Fri 02/21/2014 at 17:27:54.64

~~~ Services

~~~ Registry Values

~~~ Registry Keys

~~~ Files

~~~ Folders

~~~ FireFox

Successfully deleted: [Registry Value] HKEY_CURRENT_USER\Software\Mozilla\Firefox\Extensions\\freegames4357@bestoffers
Successfully deleted: [Registry Value] HKEY_CURRENT_USER\Software\Mozilla\Firefox\Extensions\\speedtest4354@bestoffers

~~~ Event Viewer Logs were cleared

Scan was completed on Fri 02/21/2014 at 17:40:56.92
End of JRT log

ESET Online Scanner Results

C:\Users\Asatsuya\AppData\Roaming\freegames111\install_helper.exe    a variant of Win32/bProtector.H potentially unwanted application
C:\Users\Asatsuya\AppData\Roaming\speedtest4354\install_helper.exe    a variant of Win32/bProtector.H potentially unwanted application


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These files aren´t malware but contain security risks - I would delete them immediately - your choice.




Please download SecurityCheck: LINK1 LINK2

  • Save it to your desktop, start it and follow the instructions in the window.
  • After the scan finished the (checkup.txt) will open. Copy its content to your thread.

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 Results of screen317's Security Check version 0.99.79  
   x64 (UAC is enabled)  
 Internet Explorer 10 Out of date!
``````````````Antivirus/Firewall Check:``````````````
 Windows Firewall Enabled!  
Windows Defender   
 WMI entry may not exist for antivirus; attempting automatic update.
`````````Anti-malware/Other Utilities Check:`````````
 MVPS Hosts File  
 Java 7 Update 51  
 Adobe Flash Player  
 Adobe Reader XI  
 Mozilla Firefox (27.0.1)
````````Process Check: objlist.exe by Laurent````````  
 Windows Defender MSMpEng.exe
 Windows Defender MsMpEng.exe   
 AVAST Software Avast AvastSvc.exe  
`````````````````System Health check`````````````````
 Total Fragmentation on Drive C:  %
````````````````````End of Log``````````````````````

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Your system is clean! :)




Internet Explorer out of date

Your version of Internet Explorer is outdated.

  1. Please download IE 10 from http://windows.microsoft.com/en-US/internet-explorer/downloads/ie-10/worldwide-languages
  2. Save it to your desktop.
  3. Double click on the file on your desktop to start the installation process.
  4. Reboot




Uninstall our tools using delfix

Please follow these steps in order:

  1. In the case we used Defogger to turn off your CD emulation software. You can start it again and use the Enable button.
  2. In the case we used Combofix. Deactivate your antivirus software once more, then rename the combofix.exe to uninstall.exe and run it one last time. You shall be noted that Combofix has been removed.
  3. In any case please download delfix to your desktop.
    • Close all other programms and start delfix.
    • Please check all the boxes and run the tool.
    • delfix will now delete all found traces of our removal process

[*] If there is still something left please delete it manualy.




Recommendations: How to protect yourself

  • System Updates
    Please ensure to have automatic updates activated in your control panel.
    For further information and a tutorial, see this Microsoft Support article.
  • Protection
    What you need is one (not more) virus scanner with background protection. Additionally I recommend a special malware scanner to run on demand weekly.
    Personally I am using avast! Antivirus Free Edition and Malwarebytes Anti-Malware. They offer good protection for free.
    • To keep your browser free of advertising, you may install the Adblock Plus browser extension.
      It will filter unwanted advertising out of the website´s content.
    • To protect yourself from accidentally visiting malicious web sites, install the Web of Trust (WOT) browser extension.
      It will display a green (safe), yellow (unknown) or red (potentially dangerous) icon for a visited website within your browser.
      In addition, before accessing a dangerous classified web site, a warning screen is displayed.

    [*]Up to date Software
    Keep your Windows and your third party software up to date. The easiest way to get infected is an outdated windows, followed by: browser(s) (including add-ons and plug-ins), Adobe Flash Player and Adobe Reader, Java Runtime Environment, your antivirus program and so on. These links may help you to check:

    Hardware issues, malware, fire, lightning strike: There is a long list of different ways to loose all your data. Back up your files regularly. Use the windows internal backup function or a third party tool and save your data onto an external hard drive, cloud storage, optical media like CDs or DVDs or (if available) a professional network backup system. [*]Behaviour
    The commonest error when using a computer is "error 80" - what means that the error is located about 80cm in front of the monitor. This is a common joke between IT support technicians but it shows that all the safety mechanisms won´t help if you aren´t careful enough.

    • While surfing the internet, don´t click on anything you don´t know. In the worst case, it infects your system with malware.
    • Watch your step in social networks! Many cyber criminals use them to spread malware, mine personal pata (to be sold to advertising companies, for example) or simply do damage to other users. Even if a received hyperlink within a message seems to be coming from one of your friends, have a closer look. In addition, don´t click everything.
    • When installing software, have a look to each of the setup windows and uncheck any additional toolbars or free programs that may be offered additionally. Most of today´s setup procedures contain potentially unwanted programs so keep them off your system.
    • Avoid gaming sites, pirated software, cracking tools, keygens, and peer-to-peer (P2P) file sharing programs.
      They are a security risk which can make your computer susceptible to a wide variety of malware infections, remote attacks, exposure of personal information, and identity theft. Many malicious worms and Trojans spread across P2P file sharing networks, gaming and underground sites.

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  • 2 weeks later...
  • Root Admin

Glad we could help. :)

If you need this topic reopened, please send a Private Message to any one of the moderating team members. Please include a link to this thread with your request. This applies only to the originator of this thread.

Other members who need assistance please start your own topic in a new thread. Thanks!

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