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BackDoor.PlugX.77

Added to the Dr.Web virus database: 2021-01-22

Virus description added:

Technical Information

To ensure autorun and distribution
Modifies the following registry keys
  • [<HKCU>\Software\Microsoft\Windows\CurrentVersion\Run] 'Application Verifier' = '%APPDATA%\ApplicationVerifier\ApplicationVerifier.cpl'
Malicious functions
Injects code into
the following user processes:
  • iexplore.exe
Modifies file system
Creates the following files
  • %APPDATA%\applicationverifier\applicationverifier.cpl
  • %APPDATA%\vftphnuckatx
  • %LOCALAPPDATA%\microsoft\windows\<INETFILES>\low\desktop.ini
  • %LOCALAPPDATA%\microsoft\windows\<INETFILES>\low\content.ie5\desktop.ini
  • %LOCALAPPDATA%\microsoft\windows\history\low\desktop.ini
  • %LOCALAPPDATA%\microsoft\windows\history\low\history.ie5\desktop.ini
  • %LOCALAPPDATA%\microsoft\windows\<INETFILES>\low\content.ie5\index.dat
  • %LOCALAPPDATA%\microsoft\windows\<INETFILES>\low\content.ie5\1oneaz08\desktop.ini
  • %LOCALAPPDATA%\microsoft\windows\<INETFILES>\low\content.ie5\uonvryjj\desktop.ini
  • %LOCALAPPDATA%\microsoft\windows\<INETFILES>\low\content.ie5\cdp0o06i\desktop.ini
  • %LOCALAPPDATA%\microsoft\windows\<INETFILES>\low\content.ie5\52j0br4q\desktop.ini
  • %APPDATA%\microsoft\windows\cookies\low\index.dat
  • %LOCALAPPDATA%\microsoft\windows\history\low\history.ie5\index.dat
Sets the 'hidden' attribute to the following files
  • %LOCALAPPDATA%\microsoft\windows\<INETFILES>\low\desktop.ini
  • %LOCALAPPDATA%\microsoft\windows\<INETFILES>\low\content.ie5\desktop.ini
  • %LOCALAPPDATA%\microsoft\windows\history\low\desktop.ini
  • %LOCALAPPDATA%\microsoft\windows\history\low\history.ie5\desktop.ini
  • %LOCALAPPDATA%\microsoft\windows\<INETFILES>\low\content.ie5\1oneaz08\desktop.ini
  • %LOCALAPPDATA%\microsoft\windows\<INETFILES>\low\content.ie5\uonvryjj\desktop.ini
  • %LOCALAPPDATA%\microsoft\windows\<INETFILES>\low\content.ie5\cdp0o06i\desktop.ini
  • %LOCALAPPDATA%\microsoft\windows\<INETFILES>\low\content.ie5\52j0br4q\desktop.ini
Deletes the following files
  • %WINDIR%\microsoft.net\framework\v4.0.30319\asp.netwebadminfiles\images\aspdotnet_logo.jpg
  • %WINDIR%\microsoft.net\framework\v4.0.30319\asp.netwebadminfiles\images\darkblue_grad.jpg
  • %WINDIR%\microsoft.net\framework\v4.0.30319\asp.netwebadminfiles\images\help.jpg
  • %WINDIR%\microsoft.net\framework\v4.0.30319\asp.netwebadminfiles\images\security_watermark.jpg
  • %WINDIR%\microsoft.net\framework\v4.0.30319\asp.netwebadminfiles\images\topgradrepeat.jpg
  • %WINDIR%\microsoft.net\framework64\v2.0.50727\asp.netwebadminfiles\images\aspdotnet_logo.jpg
  • %WINDIR%\microsoft.net\framework64\v2.0.50727\asp.netwebadminfiles\images\darkblue_grad.jpg
  • %WINDIR%\microsoft.net\framework64\v2.0.50727\asp.netwebadminfiles\images\help.jpg
  • %WINDIR%\microsoft.net\framework64\v2.0.50727\asp.netwebadminfiles\images\security_watermark.jpg
  • %WINDIR%\microsoft.net\framework64\v2.0.50727\asp.netwebadminfiles\images\topgradrepeat.jpg
  • %WINDIR%\microsoft.net\framework64\v4.0.30319\asp.netwebadminfiles\images\aspdotnet_logo.jpg
  • %WINDIR%\microsoft.net\framework64\v4.0.30319\asp.netwebadminfiles\images\darkblue_grad.jpg
  • %WINDIR%\microsoft.net\framework64\v4.0.30319\asp.netwebadminfiles\images\help.jpg
  • %WINDIR%\microsoft.net\framework64\v4.0.30319\asp.netwebadminfiles\images\security_watermark.jpg
  • %WINDIR%\microsoft.net\framework64\v4.0.30319\asp.netwebadminfiles\images\topgradrepeat.jpg
Network activity
UDP
  • DNS ASK im#.##crotoo.info
  • DNS ASK U4############ELQtQwaOnIHQ5v0jKm.img.microtoo.info
  • DNS ASK Sy############ELQtQwaOnIHQ5v0jKm.img.microtoo.info
  • DNS ASK hQ############ELQtQwaOnIHQ5v0jKm.img.microtoo.info
  • DNS ASK mT############ELQtQwaOnIHQ5v0jKm.img.microtoo.info
  • DNS ASK Uo############ELQtQwaOnIHQ5v0jKm.img.microtoo.info
  • DNS ASK Va############ELQtQwaOnIHQ5v0jKm.img.microtoo.info
  • DNS ASK pE############ELQtQwaOnIHQ5v0jKm.img.microtoo.info
  • DNS ASK oV############ELQtQwaOnIHQ5v0jKm.img.microtoo.info
  • DNS ASK sn#bHm/L85G5fpELQtQwaOnIHQ5v0jKm.img.microtoo.info
  • DNS ASK p/XdHvosdj65fpELQtQwaOnIHQ5v0jKm.img.microtoo.info
  • DNS ASK Nb############ELQtQwaOnIHQ5v0jKm.img.microtoo.info
  • DNS ASK t4############ELQtQwaOnIHQ5v0jKm.img.microtoo.info
  • DNS ASK Cl############ELQtQwaOnIHQ5v0jKm.img.microtoo.info
  • DNS ASK y5############ELQtQwaOnIHQ5v0jKm.img.microtoo.info
  • DNS ASK 4j############ELQtQwaOnIHQ5v0jKm.img.microtoo.info
  • DNS ASK qc############ELQtQwaOnIHQ5v0jKm.img.microtoo.info
  • DNS ASK TN############ELQtQwaOnIHQ5v0jKm.img.microtoo.info
  • DNS ASK Bw############ELQtQwaOnIHQ5v0jKm.img.microtoo.info
  • DNS ASK vR############ELQtQwaOnIHQ5v0jKm.img.microtoo.info
  • DNS ASK 93############ELQtQwaOnIHQ5v0jKm.img.microtoo.info
  • DNS ASK sx############ELQtQwaOnIHQ5v0jKm.img.microtoo.info
  • DNS ASK 7h############ELQtQwaOnIHQ5v0jKm.img.microtoo.info
  • DNS ASK 7n############ELQtQwaOnIHQ5v0jKm.img.microtoo.info
  • DNS ASK 3o############ELQtQwaOnIHQ5v0jKm.img.microtoo.info
  • DNS ASK FJ############ELQtQwaOnIHQ5v0jKm.img.microtoo.info
  • DNS ASK Ch############ELQtQwaOnIHQ5v0jKm.img.microtoo.info
  • DNS ASK GE############ELQtQwaOnIHQ5v0jKm.img.microtoo.info
  • DNS ASK oe############ELQtQwaOnIHQ5v0jKm.img.microtoo.info
  • DNS ASK 4T############ELQtQwaOnIHQ5v0jKm.img.microtoo.info
  • DNS ASK yM############ELQtQwaOnIHQ5v0jKm.img.microtoo.info
  • DNS ASK s3############ELQtQwaOnIHQ5v0jKm.img.microtoo.info
  • DNS ASK R9############ELQtQwaOnIHQ5v0jKm.img.microtoo.info
  • DNS ASK u8############ELQtQwaOnIHQ5v0jKm.img.microtoo.info
  • DNS ASK Lc############ELQtQwaOnIHQ5v0jKm.img.microtoo.info
  • DNS ASK Pb############ELQtQwaOnIHQ5v0jKm.img.microtoo.info
Miscellaneous
Executes the following
  • '%ProgramFiles(x86)%\internet explorer\iexplore.exe'
  • '%WINDIR%\syswow64\rundll32.exe' "%WINDIR%\syswow64\WININET.dll",DispatchAPICall 1

Curing recommendations

  1. If the operating system (OS) can be loaded (either normally or in safe mode), download Dr.Web Security Space and run a full scan of your computer and removable media you use. More about Dr.Web Security Space.
  2. If you cannot boot the OS, change the BIOS settings to boot your system from a CD or USB drive. Download the image of the emergency system repair disk Dr.Web® LiveDisk , mount it on a USB drive or burn it to a CD/DVD. After booting up with this media, run a full scan and cure all the detected threats.
Download Dr.Web

Download by serial number

Use Dr.Web Anti-virus for macOS to run a full scan of your Mac.

After booting up, run a full scan of all disk partitions with Dr.Web Anti-virus for Linux.

Download Dr.Web

Download by serial number

  1. If the mobile device is operating normally, download and install Dr.Web for Android. Run a full system scan and follow recommendations to neutralize the detected threats.
  2. If the mobile device has been locked by Android.Locker ransomware (the message on the screen tells you that you have broken some law or demands a set ransom amount; or you will see some other announcement that prevents you from using the handheld normally), do the following:
    • Load your smartphone or tablet in the safe mode (depending on the operating system version and specifications of the particular mobile device involved, this procedure can be performed in various ways; seek clarification from the user guide that was shipped with the device, or contact its manufacturer);
    • Once you have activated safe mode, install the Dr.Web for Android onto the infected handheld and run a full scan of the system; follow the steps recommended for neutralizing the threats that have been detected;
    • Switch off your device and turn it on as normal.

Find out more about Dr.Web for Android

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