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reggit

powershell running script using CPU

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I recently noticed in my resource monitor that 'powershell.exe' seemed to be running multiple instances, each running for only a few seconds and then terminating.  This is causing my CPU to cycle up and down every several seconds.  After poking around, things just don't seem right, but I can't figure it out.

Then I ran MB which found no threats.  Then ran adwcleaner_7.4 which founds some pre-installed items which i removed.  Then I tried to run MB in safe mode with networking - however, i kept getting a message saying 'Unable to connect to service'.  I tried a re-install which didn't work.  Then finally did clean re-install nad used the repair tool which fixed my ability to run MB.  At this point, i feel like i need help.

I just ran MB threat scan and FRST scan + addition.txt.  Attaching logs here.

 

Many thanks in advance for any guidance you can provide.

Addition.txt FRST.txt Threat scan log.txt

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Hi,  @reggit

     :welcome:

My name is Maurice. I will be helping and guiding you, going forward on this case.

 

Please read all of these lines first so that it is all clear to you about our plan. I need a one time run of MBAR like listed here, please.

Please download Malwarebytes Anti-Rootkit (MBAR) from this link here

and save it to your desktop.

 

Doubleclick on the MBAR file and allow it to run.

•Click OK on the next screen, to allow the package to extract the contents of the file to its own folder named mbar.

•mbar.exe will launch automatically. On some systems, this may take a few extra seconds. Please be patient and wait for the program to open.

•After reading the Introduction, click 'Next' if you agree.

•On the Update Database screen, click on the 'Update' button.

•Once you see 'Success: Database was successfully updated' click on 'Next', then click the Scan button.

With some infections, you may see two messages boxes:

1.'Could not load protection driver'. Click 'OK'.
2.'Could not load DDA driver'. Click 'Yes' to this message, to allow the driver to load after a restart. Allow the computer to restart. Continue with the rest of these instructions.

•If malware is found, press the Cleanup button when the scan completes. .

Please attach the log it produces, you'll find the log in that mbar folder as MBAR-log-<date and time>***.txt . Please attach that to your next reply.
 

 

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Hi,    Thank you for the MBAR report.

 

I would suggest a free scan with the ESET Online Scanner
Go to https://www.eset.com/us/home/online-scanner/

Look on the right side of the page.  Click Scan Now
It will start a download of "esetonlinescanner_enu.exe"
Save the file to your system, such as the Downloads folder, or else to the Desktop.

Go to the saved file, and double click it to get it started.
When presented with the initial ESET options, click on "Computer Scan".

Next, when prompted by Windows, allow it to start by clicking Yes

When prompted for scan type, Click on Full scan
Click on the radio selection "Enable ESET to detect and quarantine potentially unwanted applications"   and click on Start scan button.

Have patience.  The entire process may take an hour or more. There is an initial update download.
There is a progress window display.
You should ignore all prompts to get the ESET antivirus software program.   ( e.g.  their standard program).   You do not need to buy or get or install anything else.

When the scan is completed, if something was found, it will show a screen with the number of detected items.  If so, click the button marked “View detected results”.

Click The blue “Save scan log” to save the log.

If something was removed and you know it is a false finding, you may click on the blue ”Restore cleaned files”  ( in blue, at bottom).

Press Continue when all done.  You should click to off the offer for “periodic scanning”.

 

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Hi, thanks a lot!

The ESET online software is pretty cool.

It found 5 threats which were deleted.  The Chrome extension looks concerning to me.  Logfile is attached.

ESET log.txt

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Thanks for the log file.  The Chrome script file was deleted.

How are things now ?

 

You can check this system using another free tool at Microsoft.  For another opinion.

The Microsoft Safety Scanner is a free stand-alone virus scanner that  can be used to scan for & remove malware or potentially unwanted software from a system.

The download links & the how-to-run-the tool are at this link at Microsoft

https://docs.microsoft.com/en-us/windows/security/threat-protection/intelligence/safety-scanner-download

 

take a minute to locate & then send the log that it made, named msert.log

It should be at C:\Windows\debug\msert.log

[ 2 ]

Let’s start by doing a new thorough scan with Malwarebytes for Windows.   The goal is to see whether there is an infection or P U P.

 

Let's do one new run with Malwarebytes for Windows.

Start Malwarebytes.

Click Settings. Click Protection tab & scroll down to Scan options.

On the section "Potential Threat Protection"
look down at the one "Potentially Unwanted Programs (PUPs)" look and make sure it is set to
"Always detect PUPS ".

and

look down at the one "Potential Unwanted Modifications (PUM)" look and make sure it is set to
"Always detect PUM ".

and
scroll all the way down to the section Automatic Quarantine
On the line "Automatically quarantine detected malware" be sure it is ON



Then once all set there, click on SCAN button
Then insure Threat scan has a check mark. Then click Start scan.
Review the results list.
Then I would suggest you make sure all lines have a check mark

To that end, if you click the very top left checkbox you can force all detected lines ( if any are detected)  to be selected for removal. Be sure each line is checked.

image.png.e2ef251f9d7277493978972c96a0569f.png



Then you can proceed to click on the blue button Quarantine selected.


In Malwarebytes.
Click the Reports button ( on the left )
Look for the "Scan Report" that has the most recent Date and time.

When located, click the check box for it and click on View Report.
Then click the Export button at the bottom left.
Then select Text File (*.txt)

Put in a name for that file and remember where the file is created.

Then attach that file with your next reply 

 

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Hi  - i ran these two.  Please see logfiles attached.

I still am showing powershell.exe opening and terminating multiple times.  However, the CPU usage is much less.  Each instance is now consuming only about 3% which is a dramatic change (and maybe normal?).

malwarebytes log file.txt msert.log

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I also just noticed there's 'testinitsigs.exe' that loaded up and terminated.  Any idea what that is? 

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Thanks for the reports.   The Malwarebytes for Windows scan report result is perfect.

This pc has Bitdefender Antivirus Free

Run a scan with Bitdefender Antivirus Free

Let me know the result.

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Ran Bitdefender scan and it resulted in no threats found.

I've found once the pc has settled into a steady state, the CPU usage looks much more normal now.  Thank you so very much!  Unless you think there's something else to check, I think we're good!

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You may delete the tools I had you download.  I am glad to have helped you.

 

Safer practices & malware prevention:
Follow best practices when browsing the Internet, especially on opening links coming from untrusted sources.
First rule of internet safety: slow down & think before you "click".
Free games & free programs are like "candy". We do not accept them from "strangers".


Never open attachments that come with unexpected ( out of the blue ) email no matter how enticing.
Never open attachments from the email itself. Do not double click in the email. Always Save first and then scan with antivirus program.

Never click links without first hovering your mouse over the link and seeing if it is going to an odd address ( one that does not fit or is odd looking or has typos).

 

Pay close attention when installing 3rd-party programs. It is important that you pay attention to the license agreements and installation screens when installing anything off of the Internet. If an installation screen offers you Custom or Advanced installation options, it is a good idea to select these as they will typically disclose what other 3rd party software will also be installed.
Take great care in every stage of the process and every offer screen, and make sure you know what it is you're agreeing to before you click "Next".

Use a Standard user account rather than an administrator-rights account when "surfing" the web.
See more info on Corrine's SecurityGarden Blog http://securitygarden.blogspot.com/p/blog-page_7.html
Dont remove your current login. Just use the new Standard-user-level one for everyday use while on the internet.

 
Do a Windows Update.

Make certain that Automatic Updates is enabled.
https://support.microsoft.com/en-us/help/12373/windows-update-faq




Keep your system and programs up to date. Several programs release security updates on a regular basis to patch vulnerabilities. Keeping your software patched up prevents attackers from being able to exploit them to drop malware.

For other added tips, read "10 easy ways to prevent malware infection"

.

Sincerely,

Maurice

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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 topic 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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