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Virus.Win32.NAPWHICH.A

January 08, 2020
 ALIASES:

Worm:Win32/AutoRun.XXY!bit (Microsoft); RDN/Generic Downloader.x (McAfee); Backdoor.Win32.DarkKomet.hqxy (Kaspersky); Worm.Win32.AutoRun (Sunbelt)

 PLATFORM:

Windows

 OVERALL RISK RATING:
 REPORTED INFECTION:

  • Threat Type: File infector

  • Destructiveness: No

  • Encrypted:

  • In the wild: Yes

  OVERVIEW


This File infector arrives on a system as a file dropped by other malware or as a file downloaded unknowingly by users when visiting malicious sites.

  TECHNICAL DETAILS

File Size:

6,082,048 bytes

File Type:

EXE

Memory Resident:

Yes

Initial Samples Received Date:

08 Jan 2020

Arrival Details

This File infector arrives on a system as a file dropped by other malware or as a file downloaded unknowingly by users when visiting malicious sites.

Installation

This File infector adds the following processes:

  • "%User Temp%\._cache_{malware file name}"
  • %User Temp%\._cache_{malware file name}
  • "%All Users Profile%\Synaptics\Synaptics.exe" InjUpdate
  • %All Users Profile%\Synaptics\Synaptics.exe InjUpdate

(Note: %User Temp% is the current user's Temp folder, which is usually C:\Documents and Settings\{user name}\Local Settings\Temp on Windows 2000(32-bit), XP, and Server 2003(32-bit), or C:\Users\{user name}\AppData\Local\Temp on Windows Vista, 7, 8, 8.1, 2008(64-bit), 2012(64-bit) and 10(64-bit).. %All Users Profile% is the common user's profile folder, which is usually C:\Documents and Settings\All Users on Windows 2000(32-bit), XP, and Server 2003(32-bit), or C:\ProgramData on Windows Vista, 7, 8, 8.1, 2008(64-bit), 2012(64-bit) and 10(64-bit). )

It creates the following folders:

  • %Application Data%\WinSl
  • %All Users Profile%\Synaptics
  • %User Temp%\{C3514E35-CE2B-4A09-9197-656E9EDA6324}
  • %All Users Profile%\Synaptics\WS

(Note: %Application Data% is the current user's Application Data folder, which is usually C:\Documents and Settings\{user name}\Application Data on Windows 2000(32-bit), XP, and Server 2003(32-bit), or C:\Users\{user name}\AppData\Roaming on Windows Vista, 7, 8, 8.1, 2008(64-bit), 2012(64-bit) and 10(64-bit).. %All Users Profile% is the common user's profile folder, which is usually C:\Documents and Settings\All Users on Windows 2000(32-bit), XP, and Server 2003(32-bit), or C:\ProgramData on Windows Vista, 7, 8, 8.1, 2008(64-bit), 2012(64-bit) and 10(64-bit). . %User Temp% is the current user's Temp folder, which is usually C:\Documents and Settings\{user name}\Local Settings\Temp on Windows 2000(32-bit), XP, and Server 2003(32-bit), or C:\Users\{user name}\AppData\Local\Temp on Windows Vista, 7, 8, 8.1, 2008(64-bit), 2012(64-bit) and 10(64-bit).)

Other System Modifications

This File infector deletes the following files:

  • %User Temp%\8suTl6AH.exe

(Note: %User Temp% is the current user's Temp folder, which is usually C:\Documents and Settings\{user name}\Local Settings\Temp on Windows 2000(32-bit), XP, and Server 2003(32-bit), or C:\Users\{user name}\AppData\Local\Temp on Windows Vista, 7, 8, 8.1, 2008(64-bit), 2012(64-bit) and 10(64-bit).)

It adds the following registry entries:

HKEY_LOCAL_MACHINE\SOFTWARE\Wow6432Node\
Microsoft\Windows\CurrentVersion\
Run
Synaptics Pointing Device Driver = "%All Users Profile%\Synaptics\Synaptics.exe"

It deletes the following registry keys:

HKEY_CURRENT_USER\Software\Macromedia\
FlashPlayer\ConflictingProcs

Dropping Routine

This File infector drops the following files:

  • %User Temp%\FJmGfOXz.exe
  • %Application Data%\WinSl\L8\29\2019
  • %User Profile%\Documents\fp_18.0.0.203_archive\18_0_r0_203_debug\flashplayer18_0r0_203_win_sa_debug.exe
  • %User Temp%\zqfWjdg8.exe
  • %User Temp%\v1nEqSD.ini
  • %User Temp%\cKYikO4O.ico
  • %User Profile%\Documents\fp_18.0.0.203_archive\18_0_r0_203\flashplayer18_0r0_203_win.exe
  • %User Profile%\Documents\fp_18.0.0.203_archive\18_0_r0_203\flashplayer18_0r0_203_winax.exe
  • %User Profile%\Documents\fp_18.0.0.203_archive\18_0_r0_203_debug\flashplayer18_0r0_203_win_debug.exe
  • %User Temp%\AlJNvlns.exe
  • %User Temp%\GBsFXMEI.exe
  • %User Temp%\8suTl6AH.ico
  • %All Users Profile%\Synaptics\RCXD75A.tmp
  • %User Profile%\Documents\uninstall_flash_player.exe
  • %User Temp%\5PuFVzO1.ico
  • %All Users Profile%\Synaptics\Synaptics.exe
  • %User Temp%\GBsFXMEI.ico
  • %User Temp%\5PuFVzO1.exe
  • %User Profile%\Documents\fp_18.0.0.203_archive\18_0_r0_203\flashplayer18_0r0_200_winpep.exe
  • %User Temp%\._cache_{malware file name}
  • %User Temp%\l7MpxfcP.ico
  • %User Temp%\zqfWjdg8.ico
  • %User Temp%\lOQjy3i3.exe
  • %User Temp%\cKYikO4O.exe
  • %User Temp%\FJmGfOXz.ico
  • %User Profile%\Documents\fp_18.0.0.203_archive\18_0_r0_203_debug\flashplayer118_0r0_200_winpep_debug.exe
  • %User Profile%\Documents\fp_18.0.0.203_archive\18_0_r0_203_debug\flashplayer18_0r0_203_winax_debug.exe
  • %User Temp%\AlJNvlns.ico
  • %User Temp%\lOQjy3i3.ico
  • %User Temp%\l7MpxfcP.exe
  • %User Temp%\8suTl6AH.exe
  • %User Profile%\Documents\fp_18.0.0.203_archive\18_0_r0_203\uninstall_flashplayer18_0r0_203_win.exe

(Note: %User Temp% is the current user's Temp folder, which is usually C:\Documents and Settings\{user name}\Local Settings\Temp on Windows 2000(32-bit), XP, and Server 2003(32-bit), or C:\Users\{user name}\AppData\Local\Temp on Windows Vista, 7, 8, 8.1, 2008(64-bit), 2012(64-bit) and 10(64-bit).. %Application Data% is the current user's Application Data folder, which is usually C:\Documents and Settings\{user name}\Application Data on Windows 2000(32-bit), XP, and Server 2003(32-bit), or C:\Users\{user name}\AppData\Roaming on Windows Vista, 7, 8, 8.1, 2008(64-bit), 2012(64-bit) and 10(64-bit).. %User Profile% is the current user's profile folder, which is usually C:\Documents and Settings\{user name} on Windows 2000(32-bit), XP, and Server 2003(32-bit), or C:\Users\{user name} on Windows Vista, 7, 8, 8.1, 2008(64-bit), 2012(64-bit) and 10(64-bit).. %All Users Profile% is the common user's profile folder, which is usually C:\Documents and Settings\All Users on Windows 2000(32-bit), XP, and Server 2003(32-bit), or C:\ProgramData on Windows Vista, 7, 8, 8.1, 2008(64-bit), 2012(64-bit) and 10(64-bit). )

Other Details

This File infector connects to the following possibly malicious URL:

  • http://freedns.{BLOCKED}d.org/api/?{random characters}
  • http://xred.{BLOCKED}o.com
  • http://docs.{BLOCKED}e.com

This report is generated via an automated analysis system.

  SOLUTION

Minimum Scan Engine:

9.850

Step 1

Before doing any scans, Windows 7, Windows 8, Windows 8.1, and Windows 10 users must disable System Restore to allow full scanning of their computers.

Step 2

Identify and terminate files detected as Virus.Win32.NAPWHICH.A

[ Learn More ]
  1. Windows Task Manager may not display all running processes. In this case, please use a third-party process viewer, preferably Process Explorer, to terminate the malware/grayware/spyware file. You may download the said tool here.
  2. If the detected file is displayed in either Windows Task Manager or Process Explorer but you cannot delete it, restart your computer in safe mode. To do this, refer to this link for the complete steps.
  3. If the detected file is not displayed in either Windows Task Manager or Process Explorer, continue doing the next steps.

Step 3

Delete this registry value

[ Learn More ]

Important: Editing the Windows Registry incorrectly can lead to irreversible system malfunction. Please do this step only if you know how or you can ask assistance from your system administrator. Else, check this Microsoft article first before modifying your computer's registry.

  • In HKEY_LOCAL_MACHINE\SOFTWARE\Wow6432Node\Microsoft\Windows\CurrentVersion\Run
    • Synaptics Pointing Device Driver = "%All Users Profile%\Synaptics\Synaptics.exe"

Step 4

Search and delete these components

[ Learn More ]
There may be some components that are hidden. Please make sure you check the Search Hidden Files and Folders checkbox in the "More advanced options" option to include all hidden files and folders in the search result.
  • %User Temp%\FJmGfOXz.exe
  • %Application Data%\WinSl\L8\29\2019
  • %User Profile%\Documents\fp_18.0.0.203_archive\18_0_r0_203_debug\flashplayer18_0r0_203_win_sa_debug.exe
  • %User Temp%\zqfWjdg8.exe
  • %User Temp%\v1nEqSD.ini
  • %User Temp%\cKYikO4O.ico
  • %User Profile%\Documents\fp_18.0.0.203_archive\18_0_r0_203\flashplayer18_0r0_203_win.exe
  • %User Profile%\Documents\fp_18.0.0.203_archive\18_0_r0_203\flashplayer18_0r0_203_winax.exe
  • %User Profile%\Documents\fp_18.0.0.203_archive\18_0_r0_203_debug\flashplayer18_0r0_203_win_debug.exe
  • %User Temp%\AlJNvlns.exe
  • %User Temp%\GBsFXMEI.exe
  • %User Temp%\8suTl6AH.ico
  • %All Users Profile%\Synaptics\RCXD75A.tmp
  • %User Profile%\Documents\uninstall_flash_player.exe
  • %User Temp%\5PuFVzO1.ico
  • %All Users Profile%\Synaptics\Synaptics.exe
  • %User Temp%\GBsFXMEI.ico
  • %User Temp%\5PuFVzO1.exe
  • %User Profile%\Documents\fp_18.0.0.203_archive\18_0_r0_203\flashplayer18_0r0_200_winpep.exe
  • %User Temp%\._cache_{malware file name}
  • %User Temp%\l7MpxfcP.ico
  • %User Temp%\zqfWjdg8.ico
  • %User Temp%\lOQjy3i3.exe
  • %User Temp%\cKYikO4O.exe
  • %User Temp%\FJmGfOXz.ico
  • %User Profile%\Documents\fp_18.0.0.203_archive\18_0_r0_203_debug\flashplayer118_0r0_200_winpep_debug.exe
  • %User Profile%\Documents\fp_18.0.0.203_archive\18_0_r0_203_debug\flashplayer18_0r0_203_winax_debug.exe
  • %User Temp%\AlJNvlns.ico
  • %User Temp%\lOQjy3i3.ico
  • %User Temp%\l7MpxfcP.exe
  • %User Temp%\8suTl6AH.exe
  • %User Profile%\Documents\fp_18.0.0.203_archive\18_0_r0_203\uninstall_flashplayer18_0r0_203_win.exe

Step 5

Search and delete these folders

[ Learn More ]
Please make sure you check the Search Hidden Files and Folders checkbox in the More advanced options option to include all hidden folders in the search result.
  • %Application Data%\WinSl
  • %All Users Profile%\Synaptics
  • %User Temp%\{C3514E35-CE2B-4A09-9197-656E9EDA6324}
  • %All Users Profile%\Synaptics\WS

Step 6

Scan your computer with your Trend Micro product to clean files detected as Virus.Win32.NAPWHICH.A. If the detected files have already been cleaned, deleted, or quarantined by your Trend Micro product, no further step is required. You may opt to simply delete the quarantined files. Please check the following Trend Micro Support pages for more information:

Step 7

Restore this file from backup only Microsoft-related files will be restored. If this malware/grayware also deleted files related to programs that are not from Microsoft, please reinstall those programs on you computer again.

  • %User Temp%\8suTl6AH.exe

Step 8

Restore these deleted registry keys/values from backup

*Note: Only Microsoft-related keys/values will be restored. If the malware/grayware also deleted registry keys/values related to programs that are not from Microsoft, please reinstall those programs on your computer.

  • In HKEY_CURRENT_USER\Software\Macromedia\FlashPlayer
    • ConflictingProcs


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