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Powershell.exe virus


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Hi, Windows Powershell.exe always appears on my Computers at  startup, (i don't know what it is, i don't know what it does nor i don't know how it got there but its inside the system32 folder),.. its annoying because i will always have to close it in the task manager everytime i open up my computer,.. it will close itself but after 3-5 minutes

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Hi Edgar94 :)

My name is Aura and I'll be assisting you with your malware issue. Since we'll be working together, you can call me Aura or Yoan, which is my real name, it's up to you! Now that we've broke the ice, I'll just ask you a few things during the time we'll be working together to clean your system and get it back to an operational state.

  • As you'll notice, the logs we are asking for here are quite lenghty, so it's normal for me to not reply exactly after you post them. This is because I need some time to analyse them and then act accordingly. However, I'll always reply within 24 hours, 48 hours at most if something unexpected happens
  • As long as I'm assisting you on Malwarebytes Forums, in this thread, I'll ask you to not seek assistance anywhere else for any issue related to the system we are working on. If you have an issue, question, etc. about your computer, please ask it in this thread and I'll assist you
  • The same principle applies to any modifications you make to your system, I would like you to ask me before you do any manipulations that aren't in the instructions I posted. This is to ensure that we are operating in sync and I know exactly what's happening on your system
  • If you aren't sure about an instruction I'm giving you, ask me about it. This is to ensure that the clean-up process goes without any issue. I'll answer you and even give you more precise instructions/explanations if you need. There's no shame in asking questions here, better be safe than sorry!
  • If you don't reply to your thread within 3 days, I'll bump this thread to let you know that I'm waiting for you. If you don't reply after 5 days, it'll be closed. If you return after that period, you can send me a PM to get it unlocked and we'll continue where we left off;
  • Since malware can work quickly, we want to get rid of them as fast as we can, before they make unknown changes to the system. This being said, I would appreciate if you could reply to this thread within 24 hours of me posting. This way, we'll have a good clean-up rhythm and the chances of complications will be reduced
  • I'm against any form of pirated, illegal and counterfeit software and material. So if you have any installed on your system, I'll ask you to uninstall them right now. You don't have to tell me if you indeed had some or not, I'll give you the benefit of the doubt. Plus, this would be against Malwarebytes Forums's rules
  • In the end, you are the one asking for assistance here. So if you wish to go a different way during the clean-up, like format and reinstall Windows, you are free to do so. I would appreciate you to let me know about it first, and if you need, I can also assist you in the process
  • I would appreciate if you were to stay with me until the end, which means, until I declare your system clean. Just because your system isn't behaving weirdly anymore, or is running better than before, it doesn't mean that the infection is completely gone
    This being said, I have a full time job so sometimes it'll take longer for me to reply to you. Don't worry, you'll be my first priority as soon as I get home and have time to look at your thread


This being said, it's time to clean-up some malware, so let's get started, shall we? :)

If you're infected with what I believe you are infected with, Malwarebytes should be able to easily take care of it.

j1Bynr2.pngMalwarebytes - Clean Mode

  • Download and install the free version of Malwarebytes
    Note: If you have Malwarebytes already installed, you don't need to install it again. Simply start from the next bullet point
  • Once Malwarebytes is installed, launch it and let it update his database. You might have to click on the little arrow by Scan Status in the middle right pane for it to do so
  • Once the database update is complete, click on the Scan tab, then select the Threat Scan button and click on Start Scan
  • Let the scan run, the time required to complete the scan depends of your system and computer specs
  • Once the scan is complete, make sure that the first checkbox at the top is checked (which will automatically check every detected item), then click on the Quarantine Selected button
    • If it asks you to restart your computer to complete the removal, do so
  • Click on Export Summary after the deletion (in the bottom-left corner) and select Copy to Clipboard. Paste the content in your next reply


 
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Hi Aura, this is the log that I got. 

Malwarebytes
www.malwarebytes.com

-Log Details-
Scan Date: 8/13/17
Scan Time: 2:30 PM
Log File: 
Administrator: Yes

-Software Information-
Version: 3.1.2.1733
Components Version: 1.0.160
Update Package Version: 1.0.2578
License: Trial

-System Information-
OS: Windows 10 (Build 15063.540)
CPU: x64
File System: NTFS
User: alan\alan

-Scan Summary-
Scan Type: Threat Scan
Result: Completed
Objects Scanned: 409914
Threats Detected: 0
(No malicious items detected)
Threats Quarantined: 0
(No malicious items detected)
Time Elapsed: 6 min, 44 sec

-Scan Options-
Memory: Enabled
Startup: Enabled
Filesystem: Enabled
Archives: Enabled
Rootkits: Disabled
Heuristics: Enabled
PUP: Enabled
PUM: Enabled

-Scan Details-
Process: 0
(No malicious items detected)

Module: 0
(No malicious items detected)

Registry Key: 0
(No malicious items detected)

Registry Value: 0
(No malicious items detected)

Registry Data: 0
(No malicious items detected)

Data Stream: 0
(No malicious items detected)

Folder: 0
(No malicious items detected)

File: 0
(No malicious items detected)

Physical Sector: 0
(No malicious items detected)


(end)

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Nothing, interesting. Follow the instructions below.

iO3R662.pngFarbar Recovery Scan Tool (FRST) - Scan mode
Follow the instructions below to download and execute a scan on your system with FRST, and provide the logs in your next reply.

  • Download the right version of FRST for your system:
  • Move the executable (FRST.exe or FRST64.exe) on your Desktop
  • Right-click on the executable and select Spcusrh.pngRun as Administrator (for Windows Vista, 7, 8, 8.1 and 10 users)
  • Accept the disclaimer by clicking on Yes, and FRST will then do a back-up of your Registry which should take a few seconds
  • Make sure the Addition.txt box is checked
  • Click on the Scan button
    KSJwAxg.png
  • On completion, two message box will open, saying that the results were saved to FRST.txt and Addition.txt, then open two Notepad files
  • Copy and paste the content of both FRST.txt and Addition.txt in your next reply

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Alright, follow the instructions below.

iO3R662.pngFarbar Recovery Scan Tool (FRST) - Fix mode
Follow the instructions below to execute a fix on your system using FRST, and provide the log in your next reply.

  • Download the attached fixlist.txt file, and save it on your Desktop (or wherever your FRST.exe/FRST64.exe executable is located)
  • Right-click on the FRST executable and select Spcusrh.pngRun as Administrator (for Windows Vista, 7, 8, 8.1 and 10 users)
  • Click on the Fix button
    NYA5Cbr.png
  • On completion, a message will come up saying that the fix has been completed and it'll open a log in Notepad
  • Copy and paste its content in your next reply

Also, after running the fix below, a file called "DATE-TIME.zip" (DATE and TIME being the date and time on which the fix was ran) should be on your desktop. Attach it here.

fixlist.txt

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Did you ever play with the built-in Windows Apps? This looks like the culprit.

Task: {C196F276-0236-4A4B-91B2-0ECDA86A6E23} - System32\Tasks\Microsoft\Windows\AppxDeploymentClient\Reregister System Apps => powershell -windowstyle hidden -encodedcommand "cgBlAGcAIABxAHUAZQByAHkAIABIAEsAQwBVAFwAUwBvAGYAdAB3AGEAcgBlAFwATQBpAGMAcgBvAHMAbwBmAHQAXABXAGkAbgBkAG8AdwBzAFwAQwB1AHIAcgBlAG4AdABWAGUAcgBzAGkAbwBuAFwAUwBlAHIAdgBpAGMAaQBuAGcAXABBAHAAcABNAG8AZABlAGwAXABTAHkAcwB0AGUAbQBBAHAAcABGAGkAeAAgAC8AdgAgAHYAZQByAHMAaQBvAG4 (the data entry has 1554 more characters).

Full decoded command:

reg query HKCU\Software\Microsoft\Windows\CurrentVersion\Servicing\AppModel\SystemAppFix /v version
if($LASTEXITCODE -ne 0) 
{
    if(([environment]::OSVersion.Version.Build -eq 15063) -and (-not ((get-appxpackage *MicrosoftEdge*).Version.ToString().Equals("40.15063.0.0"))))
    {
        ((Get-AppxPackage | Where-Object{$_.InstallLocation -like "*SystemApps*" -and $_.Version -notlike "*15063*" -and $_.Name -notlike "*SecondaryTileExperience*"}) |% {Add-AppxPackage -register -DisableDevelopmentMode ($_.InstallLocation + "\AppxManifest.xml")})
    }
    reg add HKCU\Software\Microsoft\Windows\CurrentVersion\Servicing\AppModel\SystemAppFix /v version /t REG_DWORD /d 1 /f
}

Looks like it's a PowerShell script to reinstall all your Windows Apps. If you ever uninstalled them or else, I would understand why it's there.

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Alright.

Anyway, I don't think this task is malicious, though I can see how annoying it could be. Do you want to leave it be and see if it disappears by itself, or do you want me to remove it?

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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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