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Worm.Win32.DORKBOT.TIGAAAV

April 08, 2020
 PLATFORM:

Windows

 OVERALL RISK RATING:
 DAMAGE POTENTIAL:
 DISTRIBUTION POTENTIAL:
 REPORTED INFECTION:

  • Threat Type: Worm

  • Destructiveness: No

  • Encrypted:

  • In the wild: Yes

  OVERVIEW


This Worm 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:

1,519,616 bytes

File Type:

EXE

Memory Resident:

Yes

Initial Samples Received Date:

08 Apr 2020

Arrival Details

This Worm 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 Worm adds the following processes:

  • %User Temp%\_ir_sf7_temp_0\irsetup.exe __IRAOFF:520716 "__IRAFN:{malware file path and name}"
  • %Program Files%\DSO New Driver\InstallDriver.exe
  • "%Program Files%\DSO New Driver\DPInst64.exe" /PATH "%Program Files%\DSO New Driver" /S /LM /F /A

(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).. %Program Files% is the default Program Files folder, usually C:\Program Files in Windows 2000(32-bit), Server 2003(32-bit), XP, Vista(64-bit), 7, 8, 8.1, 2008(64-bit), 2012(64-bit) and 10(64-bit) , or C:\Program Files (x86) in Windows XP(64-bit), Vista(64-bit), 7(64-bit), 8(64-bit), 8.1(64-bit), 2008(64-bit), 2012(64-bit) and 10(64-bit).)

It creates the following folders:

  • %Program Files%\DSO New Driver
  • %Program Files%\DSO New Driver\x86
  • %User Temp%\_ir_sf7_temp_0
  • %User Temp%\{{GUID}}\amd64
  • %Windows%\DSO New Driver
  • %Program Files%\DSO New Driver\amd64
  • %User Temp%\{{GUID}}
  • %System Root%\Program Files\DIFX
  • %System Root%\Program Files\DIFX\33081A1FCF4344DF
  • %All Users Profile%\Microsoft\Windows\Start Menu\Programs\DSO New Driver
  • %Start Menu%\Programs\DSO New Driver
  • %User Temp%\{{GUID}}\x86
  • %Program Files%\DSO New Driver\Uninstall

(Note: %Program Files% is the default Program Files folder, usually C:\Program Files in Windows 2000(32-bit), Server 2003(32-bit), XP, Vista(64-bit), 7, 8, 8.1, 2008(64-bit), 2012(64-bit) and 10(64-bit) , or C:\Program Files (x86) in Windows XP(64-bit), Vista(64-bit), 7(64-bit), 8(64-bit), 8.1(64-bit), 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).. %Windows% is the Windows folder, where it usually is C:\Windows on all Windows operating system versions.. %System Root% is the Windows root folder, where it usually is C:\ on all Windows operating system versions.. %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). . %Start Menu% is the current user's Start Menu folder, which is usually C:\Windows\Start Menu or C:\Documents and Settings\{User name}\Start Menu on Windows 2000(32-bit), XP, and Server 2003(32-bit), or C:\Users\{user name}\AppData\Roaming\Microsoft\Windows\Start Menu on Windows Vista, 7, 8, 8.1, 2008(64-bit), 2012(64-bit) and 10(64-bit).)

Other System Modifications

This Worm deletes the following files:

  • %Start Menu%\Programs\DSO New Driver\UninstallFile.lnk
  • %Start Menu%\Programs\DSO New Driver\UninstallDriver.lnk
  • %Start Menu%\Programs\DSO New Driver\InstallDriver.lnk

(Note: %Start Menu% is the current user's Start Menu folder, which is usually C:\Windows\Start Menu or C:\Documents and Settings\{User name}\Start Menu on Windows 2000(32-bit), XP, and Server 2003(32-bit), or C:\Users\{user name}\AppData\Roaming\Microsoft\Windows\Start Menu 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\
Uninstall\DSO New Driver
DisplayName = "DSO New Driver"

HKEY_LOCAL_MACHINE\SOFTWARE\Wow6432Node\
Microsoft\Windows\CurrentVersion\
Uninstall\DSO New Driver
NoModify = "1"

HKEY_LOCAL_MACHINE\SOFTWARE\Wow6432Node\
Microsoft\Windows\CurrentVersion\
Uninstall\DSO New Driver
NoRepair = "1"

HKEY_LOCAL_MACHINE\SOFTWARE\Wow6432Node\
Microsoft\Windows\CurrentVersion\
Uninstall\DSO New Driver
UninstallString = "{random characters}"

HKEY_LOCAL_MACHINE\SOFTWARE\Wow6432Node\
Microsoft\Windows\CurrentVersion\
Uninstall\DSO New Driver
Contact = "{random characters}"

HKEY_LOCAL_MACHINE\SOFTWARE\Wow6432Node\
Microsoft\Windows\CurrentVersion\
Uninstall\DSO New Driver
DisplayIcon = "%Windows%\DSO New Driver\uninstall.exe"

HKEY_LOCAL_MACHINE\SYSTEM\Setup\
SetupapiLogStatus
setupapi.dev.log = "4096"

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows\CurrentVersion\Uninstall\
EB0473D7B54B639166F0365440F6DA213E99C59E
UninstallString = "{random characters}"

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows\CurrentVersion\Uninstall\
EB0473D7B54B639166F0365440F6DA213E99C59E
DisplayName = "{random characters}"

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows\CurrentVersion\Uninstall\
EB0473D7B54B639166F0365440F6DA213E99C59E
DisplayIcon = "%System Root%\PROGRA~1\DIFX\33081A1FCF4344DF\DPInst64.exe,0"

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows\CurrentVersion\Uninstall\
EB0473D7B54B639166F0365440F6DA213E99C59E
DisplayVersion = "04/08/2013 1.2.4.0"

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows\CurrentVersion\Uninstall\
EB0473D7B54B639166F0365440F6DA213E99C59E
Publisher = "libusb-win32"

Dropping Routine

This Worm drops the following files:

  • %User Temp%\{{GUID}}\USB_Device.cat
  • %Windows%\DPINST.LOG
  • %Program Files%\DSO New Driver\x86\libusb0_x86.dll
  • %User Temp%\{{GUID}}\libusb0.inf
  • %Program Files%\DSO New Driver\DPInst32.exe
  • %User Temp%\_ir_sf7_temp_0\IRIMG1.JPG
  • %Program Files%\DSO New Driver\x86\libusb0.sys
  • %Program Files%\DSO New Driver\Uninstall\uni9F3B.tmp
  • %Windows%\inf\setupapi.dev.log
  • %User Temp%\{{GUID}}\amd64\libusb0.sys
  • %All Users Profile%\Microsoft\Windows\Start Menu\Programs\DSO New Driver\InstallDriver.lnk
  • %User Temp%\_ir_sf7_temp_0\irsetup.exe
  • %User Temp%\_ir_sf7_temp_0\irsetup.dat
  • %All Users Profile%\Microsoft\Windows\Start Menu\Programs\DSO New Driver\UninstallDriver.lnk
  • %Program Files%\DSO New Driver\Uninstall\uninstall.xml
  • %Program Files%\DSO New Driver\Uninstall\IRIMG1.JPG
  • %User Temp%\{{GUID}}\amd64\libusb0.dll
  • %Program Files%\DSO New Driver\libusb0.cat
  • %Program Files%\DSO New Driver\DPInst64.exe
  • %Program Files%\DSO New Driver\Uninstall\uninstall.dat
  • %Program Files%\DSO New Driver\UninstallDriver.exe
  • %Program Files%\DSO New Driver\amd64\libusb0.sys
  • %All Users Profile%\Microsoft\Windows\Start Menu\Programs\DSO New Driver\UninstallFile.lnk
  • %Program Files%\DSO New Driver\usb_device.cat
  • %User Temp%\_ir_sf7_temp_0\IRIMG2.JPG
  • %Program Files%\DSO New Driver\amd64\libusb0.dll
  • %Program Files%\DSO New Driver\libusb0.dll
  • %Program Files%\DSO New Driver\InstallDriver.exe
  • %Windows%\DSO New Driver Setup Log.txt
  • %User Temp%\{{GUID}}\x86\libusb0_x86.dll
  • %Program Files%\DSO New Driver\libusb0.inf
  • %Windows%\DSO New Driver\uninstall.exe
  • %System Root%\Program Files\DIFX\33081A1FCF4344DF\DPInst64.exe
  • %Program Files%\DSO New Driver\Uninstall\IRIMG2.JPG

(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).. %Windows% is the Windows folder, where it usually is C:\Windows on all Windows operating system versions.. %Program Files% is the default Program Files folder, usually C:\Program Files in Windows 2000(32-bit), Server 2003(32-bit), XP, Vista(64-bit), 7, 8, 8.1, 2008(64-bit), 2012(64-bit) and 10(64-bit) , or C:\Program Files (x86) in Windows XP(64-bit), Vista(64-bit), 7(64-bit), 8(64-bit), 8.1(64-bit), 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). . %System Root% is the Windows root folder, where it usually is C:\ on all Windows operating system versions.)

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 Worm.Win32.DORKBOT.TIGAAAV

[ 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\Uninstall\DSO New Driver
    • DisplayName = "DSO New Driver"
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Wow6432Node\Microsoft\Windows\CurrentVersion\Uninstall\DSO New Driver
    • NoModify = "1"
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Wow6432Node\Microsoft\Windows\CurrentVersion\Uninstall\DSO New Driver
    • NoRepair = "1"
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Wow6432Node\Microsoft\Windows\CurrentVersion\Uninstall\DSO New Driver
    • UninstallString = "{random characters}"
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Wow6432Node\Microsoft\Windows\CurrentVersion\Uninstall\DSO New Driver
    • Contact = "{random characters}"
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Wow6432Node\Microsoft\Windows\CurrentVersion\Uninstall\DSO New Driver
    • DisplayIcon = "%Windows%\DSO New Driver\uninstall.exe"
  • In HKEY_LOCAL_MACHINE\SYSTEM\Setup\SetupapiLogStatus
    • setupapi.dev.log = "4096"
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Uninstall\EB0473D7B54B639166F0365440F6DA213E99C59E
    • UninstallString = "{random characters}"
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Uninstall\EB0473D7B54B639166F0365440F6DA213E99C59E
    • DisplayName = "{random characters}"
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Uninstall\EB0473D7B54B639166F0365440F6DA213E99C59E
    • DisplayIcon = "%System Root%\PROGRA~1\DIFX\33081A1FCF4344DF\DPInst64.exe,0"
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Uninstall\EB0473D7B54B639166F0365440F6DA213E99C59E
    • DisplayVersion = "04/08/2013 1.2.4.0"
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Uninstall\EB0473D7B54B639166F0365440F6DA213E99C59E
    • Publisher = "libusb-win32"

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%\{{GUID}}\USB_Device.cat
  • %Windows%\DPINST.LOG
  • %Program Files%\DSO New Driver\x86\libusb0_x86.dll
  • %User Temp%\{{GUID}}\libusb0.inf
  • %Program Files%\DSO New Driver\DPInst32.exe
  • %User Temp%\_ir_sf7_temp_0\IRIMG1.JPG
  • %Program Files%\DSO New Driver\x86\libusb0.sys
  • %Program Files%\DSO New Driver\Uninstall\uni9F3B.tmp
  • %Windows%\inf\setupapi.dev.log
  • %User Temp%\{{GUID}}\amd64\libusb0.sys
  • %All Users Profile%\Microsoft\Windows\Start Menu\Programs\DSO New Driver\InstallDriver.lnk
  • %User Temp%\_ir_sf7_temp_0\irsetup.exe
  • %User Temp%\_ir_sf7_temp_0\irsetup.dat
  • %All Users Profile%\Microsoft\Windows\Start Menu\Programs\DSO New Driver\UninstallDriver.lnk
  • %Program Files%\DSO New Driver\Uninstall\uninstall.xml
  • %Program Files%\DSO New Driver\Uninstall\IRIMG1.JPG
  • %User Temp%\{{GUID}}\amd64\libusb0.dll
  • %Program Files%\DSO New Driver\libusb0.cat
  • %Program Files%\DSO New Driver\DPInst64.exe
  • %Program Files%\DSO New Driver\Uninstall\uninstall.dat
  • %Program Files%\DSO New Driver\UninstallDriver.exe
  • %Program Files%\DSO New Driver\amd64\libusb0.sys
  • %All Users Profile%\Microsoft\Windows\Start Menu\Programs\DSO New Driver\UninstallFile.lnk
  • %Program Files%\DSO New Driver\usb_device.cat
  • %User Temp%\_ir_sf7_temp_0\IRIMG2.JPG
  • %Program Files%\DSO New Driver\amd64\libusb0.dll
  • %Program Files%\DSO New Driver\libusb0.dll
  • %Program Files%\DSO New Driver\InstallDriver.exe
  • %Windows%\DSO New Driver Setup Log.txt
  • %User Temp%\{{GUID}}\x86\libusb0_x86.dll
  • %Program Files%\DSO New Driver\libusb0.inf
  • %Windows%\DSO New Driver\uninstall.exe
  • %System Root%\Program Files\DIFX\33081A1FCF4344DF\DPInst64.exe
  • %Program Files%\DSO New Driver\Uninstall\IRIMG2.JPG

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.
  • %Program Files%\DSO New Driver
  • %Program Files%\DSO New Driver\x86
  • %User Temp%\_ir_sf7_temp_0
  • %User Temp%\{{GUID}}\amd64
  • %Windows%\DSO New Driver
  • %Program Files%\DSO New Driver\amd64
  • %User Temp%\{{GUID}}
  • %System Root%\Program Files\DIFX
  • %System Root%\Program Files\DIFX\33081A1FCF4344DF
  • %All Users Profile%\Microsoft\Windows\Start Menu\Programs\DSO New Driver
  • %Start Menu%\Programs\DSO New Driver
  • %User Temp%\{{GUID}}\x86
  • %Program Files%\DSO New Driver\Uninstall

Step 6

Scan your computer with your Trend Micro product to delete files detected as Worm.Win32.DORKBOT.TIGAAAV. 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.

  • %Start Menu%\Programs\DSO New Driver\UninstallFile.lnk
  • %Start Menu%\Programs\DSO New Driver\UninstallDriver.lnk
  • %Start Menu%\Programs\DSO New Driver\InstallDriver.lnk


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