PLATFORM:

Windows

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

  • Threat Type: Trojan

  • Destructiveness: No

  • Encrypted:

  • In the wild: Yes

  OVERVIEW

This Trojan 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: 575,488 bytes
File Type: EXE
Memory Resident: Yes
Initial Samples Received Date: 15 May 2020

Arrival Details

This Trojan 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 Trojan adds the following processes:

  • %System%\regsvr32.exe -s %User Temp%\D1CE6A~1.DLL f1 %User Temp%\D1CE6A~1.DAT@2728
  • %Windows%\SysWOW64\rundll32.exe %User Temp%\D1CE6A~1.DLL,f0
  • %System%\rundll32.exe %All Users Profile%\E74BA3F6\7BF54496.dll,f1 %User Temp%\D1CE6A~1.DLL@2196
  • %Windows%\syswow64\rundll32.exe %All Users Profile%\E74BA3F6\DDA2AC8B.dll,f2 F709AA619059A3AAB3E71D0ADA462372
  • %System%\RUNDLL32.EXE %All Users Profile%\E74BA3F6\7BF54496.dll,f2 1FCAAAC36182D72B5B244331A7421701
  • cmd.exe /c sc qc E74BA3F6
  • %System%\svchost.exe -k LocalService

(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.. %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:

  • %All Users Profile%\E74BA3F6\3E92A3FD
  • %All Users Profile%\E74BA3F6\FDD4AE5C
  • %All Users Profile%\E74BA3F6

(Note: %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). )

Autostart Technique

This Trojan registers itself as a system service to ensure its automatic execution at every system startup by adding the following registry entries:

HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\
services\E74BA3F6
ImagePath = "%System%\svchost.exe -k LocalService"

HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\
Services\E74BA3F6
ImagePath = "%System%\svchost.exe -k LocalService"

Other System Modifications

This Trojan adds the following registry entries:

HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\
services\E74BA3F6
ObjectName = "LocalSystem"

HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\
services\E74BA3F6\Parameters
ServiceDll = "%All Users Profile%\E74BA3F6\7BF54496.dll"

HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\
services\E74BA3F6
ErrorControl = "1"

HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\
services\E74BA3F6
Start = "2"

HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\
services\E74BA3F6
Type = "272"

HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\
Services\E74BA3F6
DisplayName = "E74BA3F6"

HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\
Services\E74BA3F6
Start = "SERVICE_AUTO_START"

It modifies the following registry entries:

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows NT\CurrentVersion\Svchost
LocalService = "\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00"

(Note: The default value data of the said registry entry is {random values}.)

HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\
Control
WaitToKillServiceTimeout = "120000"

(Note: The default value data of the said registry entry is 20000.)

Dropping Routine

This Trojan drops the following files:

  • %All Users Profile%\E74BA3F6\DDA2AC8B.dll
  • %User Temp%\d1ce6a48518c2f7b505a90462af916723c0c1bb1.dll
  • %All Users Profile%\E74BA3F6\7BF54496.dll
  • %All Users Profile%\E74BA3F6\742938FC
  • %All Users Profile%\E74BA3F6\9C0EC0A7
  • %All Users Profile%\E74BA3F6\3E92A3FD\AE94EA652D6A5FC0CD74F93877723DBD

(Note: %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).)

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 Trojan.Win32.DANABOT.TIOIBFBB

[ 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\SYSTEM\CurrentControlSet\services\E74BA3F6
    • ObjectName = "LocalSystem"
  • In HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\services\E74BA3F6\Parameters
    • ServiceDll = "%All Users Profile%\E74BA3F6\7BF54496.dll"
  • In HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\services\E74BA3F6
    • ErrorControl = "1"
  • In HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\services\E74BA3F6
    • Start = "2"
  • In HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\services\E74BA3F6
    • Type = "272"
  • In HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\E74BA3F6
    • DisplayName = "E74BA3F6"
  • In HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\E74BA3F6
    • Start = "SERVICE_AUTO_START"

Step 4

Restore these modified registry values

[ Learn More ]

Important:Editing the Windows Registry incorrectly can lead to irreversible system malfunction. Please do this only if you know how to or you can seek your system administrator's help. You may also check out this Microsoft article first before modifying your computer's registry.

  • In HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Svchost
    • From: LocalService = "\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00"
      To: LocalService = ""{random values}""
  • In HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\Control
    • From: WaitToKillServiceTimeout = "120000"
      To: WaitToKillServiceTimeout = ""20000""

Step 5

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.
  • %All Users Profile%\E74BA3F6\DDA2AC8B.dll
  • %User Temp%\d1ce6a48518c2f7b505a90462af916723c0c1bb1.dll
  • %All Users Profile%\E74BA3F6\7BF54496.dll
  • %All Users Profile%\E74BA3F6\742938FC
  • %All Users Profile%\E74BA3F6\9C0EC0A7
  • %All Users Profile%\E74BA3F6\3E92A3FD\AE94EA652D6A5FC0CD74F93877723DBD

Step 6

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.
  • %All Users Profile%\E74BA3F6\3E92A3FD
  • %All Users Profile%\E74BA3F6\FDD4AE5C
  • %All Users Profile%\E74BA3F6

Step 7

Scan your computer with your Trend Micro product to delete files detected as Trojan.Win32.DANABOT.TIOIBFBB. 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:


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