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Powershell detected as exploit.


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Hello! I have recently booted my computer and antivirus just said to me "Exploit Blocked - File: PowerShell.exe Defense Layer: APT Behavior Protection Technique: T1055 - Defense Evasion". So I have started multiple times scan howewer it did not detected anything related. I will attach the image here but it's in czech.

Thanks for any help.

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Hello @Pixeluted and :welcome::

While you are waiting for the next qualified/approved malware removal expert helper to weigh in on your topic, and even though you may have run one or more of its following procedural steps, please carefully follow the instructions within the following:

I am infected - What do I do now?

If the Windows® system language is not normally set to English, please rename the FRST executable app to FRSTENGLISH.exe before running. E.G. - FRST64.exe ⇾ FRSTENGLISH.exe

Remember, please be certain to attach (not Copy and Paste) the three (3) resultant report files in your next reply to this topic.

Thank you.

Edited by 1PW
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Hello :welcome: 

I will guide you along on looking for remaining malware. Lets keep these principles as we go along.

  • Removing malware can be unpredictable
  • Please don't run any other scans, download, install or uninstall any programs while I'm working with you.
  • Only run the tools I guide you to.
  • Do not run online games while case is on-going. Do not do any free-wheeling web-surfing.
  • The removal of malware isn't instantaneous, please be patient.
  • Cracked or or hacked or pirated programs are not only illegal, but also will make a computer a malware victim. Having such programs installed, is the easiest way to get infected. It is the leading cause of ransomware encryptions. It is at times also big source of current trojan infections. Please uninstall them now, if any are here, before we start the cleaning procedure.
  • Please stick with me until I give you the "all clear".
  • If your system is running Discord, please be sure to Exit out of it while this case is on-going.
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Please  set File Explorer to SHOW ALL folders, all files, including Hidden ones.  Use OPTION ONE or TWO of this article
Please use this Guide

Start Malwarebytes. Click Settings ( gear ) icon. Next, lets make real sure that Malwarebytes does NOT register with Windows Security Center

Click the Security Tab. Scroll down to

"Windows Security Center"

Click the selection to the left  for the line "Always register Malwarebytes in the Windows Security Center".
{ We want that to be set as Off   .... be sure that line's  radio-button selection is all the way to the Left.  thanks. }

This will not affect any real-time protection of the Malwarebytes for Windows    😃.

Close Malwarebytes.

>

This next tool ought to take something in the range of 15 - 25 minutes tops, depending on hardware speed.
get & run the Malwarebytes MBAR anti-rootkit tool to do 1 run with it.
Disregard the title subject of the topic.Run the MBAR tool as listed here 

https://forums.malwarebytes.com/topic/198907-requested-resource-is-in-use-error-unable-to-start-malwarebytes

  • when done, I need the MBAR logs.
  • Upon completion of the scan or after the reboot, two files named mbar-log.txt and system-log.txt will be created.
  • Both files can be found in the extracted MBAR folder on your Desktop.
  • Please attach both files in your next reply.

 

I would like a report set for review.   This is a report only.

Please download MALWAREBYTES MBST Support Tool

Once you start it click Advanced >>> then   Gather Logs

 Have patience till the run has finished.

Upload an archive once it is done. Attach the mbst-grab-results.zip from the Desktop.

 

  • Please attach  mbst-grab-results.zip    to your reply
  • The IP block actions by Malwarebytes are keeping the machine safe from potential threats.
  • We do need the support zip reports to see more detail  ( the screen grabs just do not have full details + those screens give no clue as to what processes are running.
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Please run the following custom script. Read all of this before you start. Please Close all open work.

Once the script-run has been completed, please attach the file FIXLOG.TXT to your next reply

 

Farbar program location:   C:\Users\Pixeluted\Desktop\FRSTENGLISH.exe

 

Please download the attached fixlist.txt file and save it to C:\Users\Pixeluted\Desktop

Fixlist.txt

 

NOTE. It's important that both files, FRSTENGLISH, and fixlist.txt are in the same location or the fix will not work.

Please make sure you disable any real-time antivirus or security software before running this script. Once completed, make sure you re-enable it.

NOTICE: This script was written specifically for this user, for use on this particular machine. Running this on another machine may cause damage to your operating system that cannot be undone.

RIGHT-Click on   FRSTENGLISH and select

RUN as Administrator

and ALLOW it to proceed forward  ( Answer YES when prompted to go forth) , and press the Fix button just once and wait.
If the tool needs a restart please make sure you let the system restart normally and let the tool complete its run after restart.
The tool will make a log on the Desktop (Fixlog.txt) or wherever you ran FRST from. Please attach or post it to your next reply.

Note: If the tool warned you about an outdated version please download and run the updated version.

NOTE-1:  This fix will run a scan to check that all Microsoft operating system files are valid and not corrupt and attempt to correct any invalid files.  Depending on the speed of your computer this fix may take 30 -45 minutes or more.

 

Important: items are permanently deleted. They are not moved to quarantine. If you have any questions or concerns please ask before running this fix.

The system will be rebooted after the fix has run. Attach FIXLOG.txt with net reply.

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Thank you. The custom run is good. As we go along, and when you Reply, it would help me to know whether the "Exploit" notice by Malwarebytes has stopped.

As a next step, I suggest the following:

This is for a scan with ESET Onlinescanner (free). ESET is a well-respected, well-known entity and tool.

This here you can start & once it is under way, you can leave the machine alone & let it run over-night. No need to keep watch once it starts the actual scan run.

Next, This will be a check with ESET Onlinescanner for viruses, other malware, adwares, & potentially unwanted applications.

Go to https://download.eset.com/com/eset/tools/online_scanner/latest/esetonlinescanner.exe

It will start a download of "esetonlinescanner.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 CUSTOM scan  and select C drive to be scanned
  • Look at & tick ( select ) 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 may step away from machine &. Let it be. That is, once it is under way, you should leave it running. It will run for several hours.

  • At screen "Detections occurred and resolved" click on blue button "View detected results"
  • On next screen, at lower left, click on blue "Save scan log"
  • View where file is to be saved. Provide a meaningful name for the "File name:"
  • On last screen, set to Off (left) the option for Periodic scanning
  • Click "save and continue"
  • Please attach the report file so I can review
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One other scan here.

TrendMicro HouseCall scan

https://www.trendmicro.com/en_us/forHome/products/housecall.html

First, Download & Save to your Downloads folder the appropriate HouseCallLauncher
Once the download is complete, go to where the Housecalllauncher is saved & double-click it to start it.

The program will check with TrendMicro & do a update run.

Next it will show the Disclosure window.

Click Next to proceed.

The end user license agreement is presented.   Click the Accept radio button & click Next to proceed.

IF you wish a Full scan or a Custom scan, first click on the Settings

then you can select which drives you want to include in the scan.

The default is a Quick scan.

Click Scan now when ready.

The scan progress will then be displayed.   Monitor the progress or just leave it alone until it finishes this phase.

When the scan phase has completed, if any items are tagged, you will see a list, showing  the file & its location, the classification of the threat, the type, risk, and Action option.

If you see an item that you know is safe, you can click the Action  , and select Ignore.

When all done & ready, click the Fix now button.

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Hi. Now a different scan with another security scanner. 

This with Kaspersky KVRT tool.

Download Kaspersky Virus Removal Tool (KVRT) from here: https://www.kaspersky.com/downloads/thank-you/free-virus-removal-tool and save to your Desktop.

Next, Select the Windows Key and R Key together, the "Run" box should open.

user posted image

Drag and Drop KVRT.exe into the Run Box.

user posted image

C:\Users\Pixeluted\DESKTOP\KVRT.exe will now show in the run box.

user posted image

add 
-dontencrypt

 Note the space between KVRT.exe and -dontencrypt

C:\Users\Pixeluted\DESKTOP\KVRT.exe -dontencrypt 

should now show in the Run box.

user posted image

That addendum to the run command is very important.


To start the scan select OK in the "Run" box.



The Windows Protected your PC window "may" open, IF SO then select "More Info"

user posted image

A new Window will open, select "Run anyway"

user posted image

A EULA window will open, tick both confirmation boxes then select "Accept"

user posted image

In the new window select "Change Parameters"

user posted image

 
  • In the new window ensure the following boxes are ticked:
    • System memory
    • Startup objects
    • Boot sectors
    • System drive
  • Then select "OK" and „Start scan“.

The Kaspersky tool is very thorough so will take a considerable time to complete, please allow it to finish. Also while Kaspersky runs do not use your PC for anything else..

  • completed: If entries are found, there will be options to choose. If "Cure" is offered, leave as it is. For any other options change to "Delete", then select "Continue".
  • Usually, your system needs a reboot to finish the removal process.
  • Logfiles can be found on your systemdrive (usually C: ), similar like this:

Reports are saved here C:\KVRT_data\Reports and look similar to this report_20230101_103000.klr

  • Right click direct onto those reports, select > open with > Notepad.
  • Save the files and attach them with your next reply
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Hello. Q: How is the situation today ?

One other scan here.

TrendMicro HouseCall scan

https://www.trendmicro.com/en_us/forHome/products/housecall.html

First, Download & Save to your Downloads folder the appropriate HouseCallLauncher
Once the download is complete, go to where the Housecalllauncher is saved & double-click it to start it.

The program will check with TrendMicro & do a update run.

Next it will show the Disclosure window.

Click Next to proceed.

The end user license agreement is presented.   Click the Accept radio button & click Next to proceed.

IF you wish a Full scan or a Custom scan, first click on the Settings

then you can select which drives you want to include in the scan.

The default is a Quick scan.

Click Scan now when ready.

The scan progress will then be displayed.   Monitor the progress or just leave it alone until it finishes this phase.

When the scan phase has completed, if any items are tagged, you will see a list, showing  the file & its location, the classification of the threat, the type, risk, and Action option.

If you see an item that you know is safe, you can click the Action  , and select Ignore.

When all done & ready, click the Fix now button.

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  • 3 weeks later...

Due to the lack of feedback, this topic is closed to prevent others from posting here.

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

Tips to help protect from infection

Thanks

 

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