BKDR_SDBOT.USCZ


 PLATFORM:

Windows

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

  • Threat Type: Backdoor

  • Destructiveness: No

  • Encrypted:

  • In the wild: Yes

  OVERVIEW

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

It disables Task Manager, Registry Editor, and Folder Options.

It deletes itself after execution.

  TECHNICAL DETAILS

File Size:

402,922 bytes

File Type:

EXE

Memory Resident:

Yes

Initial Samples Received Date:

10 Sep 2015

Arrival Details

This backdoor 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 backdoor drops the following copies of itself into the affected system:

  • \wininit32.exe

Autostart Technique

This backdoor adds the following registry entries to enable its automatic execution at every system startup:

HKEY_CURRENT_USER\Software\Microsoft\
Windows\CurrentVersion\Run
SysInit = "wininit32.exe -drivers"

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows\CurrentVersion\Run
SysInit = "wininit32.exe -services"

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows\CurrentVersion\RunServices
SysInit = "wininit32.exe -services"

It modifies the following registry entries to ensure it automatic execution at every system startup:

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows NT\CurrentVersion\Winlogon
Shell = "Explorer.exe"

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

Other System Modifications

This backdoor deletes the following files:

  • %System Root%\DRG.EXE
  • %Program Files%\win32.dll
  • %Program Files%\winsrv32.exe
  • %System Root%\JZANDEMPFUCKEDYOU.exe
  • %Common Startup%\BullGuard.lnk
  • %Common Startup%\BullGuard Update.lnk
  • %Windows%\Hello-Kitty.exe
  • %Windows%\BigMac.exe
  • %Windows%\WINMGM32.EXE
  • %Windows%\fonts\explorer.exe
  • %Windows%\fonts\rundll32.exe
  • %Windows%\litmus\winup.exe
  • %Windows%\litmus\msgsrv32.exe
  • %Windows%\litmus\MSGSRV16.exe
  • %Windows%\dllreg.exe
  • %Windows%\windrv.exe
  • %Windows%\SvcHost32.exe
  • %Windows%\Win32DLL.vbs
  • %Windows%\msbb.exe
  • %Windows%\RYFLSYCI.EXE
  • %Windows%\services.exe
  • %Windows%\WINLOGON.EXE
  • %Windows%\csrss.exe
  • %Windows%\winstart32.exe
  • %Windows%\Hwinfoq.com
  • %Windows%\Lorupscr.scr
  • %Windows%\systools.exe
  • %Windows%\systask32l.exe
  • %Windows%\avserve.exe
  • %Windows%\avserve2.exe
  • %Windows%\netskyave.exe
  • %Windows%\NsUpdate.exe
  • %System%\System32.exe
  • %System%\cmd32.exe
  • %System%\directv9x.exe
  • %System%\explorer32.exe
  • %System%\iexpIore.exe
  • %System%\LCD.exe
  • %System%\svhost.exe
  • %System%\wupdate.exe
  • %System%\SYSCFG.exe
  • %System%\wupdmngr.exe
  • %System%\restsystem.exe
  • %System%\system28.exe
  • %System%\aeagea.exe
  • %System%\picture.exe
  • %System%\ZLoad.exe
  • %System%\TCPSVS32.EXE
  • %System%\NAV32_LOADER.EXE
  • %System%\winservices.exe
  • %System%\RAVMOND.exe
  • %System%\WinHelp.exe
  • %System%\WinGate.exe
  • %System%\IEXPLORE.EXE
  • %System%\shimgapi.dll
  • %System%\load32.exe
  • %System%\vxdmgr32.exe
  • %System%\worm.exe
  • %System%\MSKernel32.vbs
  • %System%\WinFAT32.EXE
  • %System%\drvddll.exe
  • %System%\sms.exe
  • %System%\setup\config\imss.exe
  • %System%\setup\config\rmss.exe
  • %System%\setup\config\hidden32.exe
  • %System%\setup\config\FireDaemon.exe
  • %System%\setup\config\services.exe
  • %System%\ln32k.exe
  • %System%\SYSWB6.exe
  • %System%\version.exe
  • %System%\__sys.exe
  • %System%\drivers\svchost.exe
  • %System%\sysmon\sysmon.exe
  • %Windows%\mirc.exe
  • %System%\mirc.exe
  • %Windows%\mirc32.exe
  • %System%\mirc32.exe
  • %Windows%\explore.exe
  • %System%\explore.exe
  • %Windows%\psexec.exe
  • %System%\psexec.exe
  • %Windows%\rconnect.exe
  • %System%\rconnect.exe
  • %Windows%\mirc.ini
  • %System%\mirc.ini
  • %Windows%\script.ini
  • %System%\script.ini
  • %Windows%\settings.ini
  • %System%\settings.ini
  • %Temp%.scr
  • %System%\temp.scr
  • %Windows%\remote.ini
  • %System%\remote.ini
  • %Program Files%\Common Files\CMEII\Ðfž
  • %Program Files%\Common Files\GMT
  • %Program Files%\Common Files\KeenValue
  • %Program Files%\MyWay\myBar\1.bin
  • %Program Files%\Common Files\updmgr
  • %Program Files%\PerfectNav\BHO
  • %Program Files%\WhenUSearch
  • %Program Files%\Superbar

It deletes the following folders:

  • %Program Files%\Common Files\CMEII

(Note: %Program Files% is the Program Files folder, where it usually is C:\Program Files on all Windows operating system versions; C:\Program Files (x86) for 32-bit applications running on Windows 64-bit operating systems.)

It adds the following registry keys:

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Connect

HKEY_LOCAL_MACHINE\Software\Microsoft\
Windows\CurrentVersion\RunServices

HKEY_CURRENT_USER\Software\Microsoft\
Windows\CurrentVersion\Policies\
Explorer\DisallowRun

It adds the following registry entries:

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Connect
LastMonth = "8"

It modifies the following registry entries:

HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\
Control\Lsa
restrictanonymous = "1"

It creates the following registry entry(ies) to disable Task Manager, Registry Tools and Folder Options:

HKEY_CURRENT_USER\Software\Microsoft\
Windows\CurrentVersion\Policies\
Explorer
DisallowRun = "1"

HKEY_CURRENT_USER\Software\Microsoft\
Windows\CurrentVersion\Policies\
Explorer\DisallowRun
0 = "̲A"

HKEY_CURRENT_USER\Software\Microsoft\
Windows\CurrentVersion\Policies\
Explorer\DisallowRun
1 = "¼²A"

HKEY_CURRENT_USER\Software\Microsoft\
Windows\CurrentVersion\Policies\
Explorer\DisallowRun
2 = "¬²A"

HKEY_CURRENT_USER\Software\Microsoft\
Windows\CurrentVersion\Policies\
Explorer\DisallowRun
3 = " ²A"

HKEY_CURRENT_USER\Software\Microsoft\
Windows\CurrentVersion\Policies\
Explorer\DisallowRun
4 = "²A"

HKEY_CURRENT_USER\Software\Microsoft\
Windows\CurrentVersion\Policies\
Explorer\DisallowRun
5 = "²A"

HKEY_CURRENT_USER\Software\Microsoft\
Windows\CurrentVersion\Policies\
Explorer\DisallowRun
6 = "p²A"

HKEY_CURRENT_USER\Software\Microsoft\
Windows\CurrentVersion\Policies\
Explorer\DisallowRun
7 = "d²A"

HKEY_CURRENT_USER\Software\Microsoft\
Windows\CurrentVersion\Policies\
Explorer\DisallowRun
8 = "X²A"

HKEY_CURRENT_USER\Software\Microsoft\
Windows\CurrentVersion\Policies\
Explorer\DisallowRun
9 = "L²A"

HKEY_CURRENT_USER\Software\Microsoft\
Windows\CurrentVersion\Policies\
Explorer\DisallowRun
10 = "8²A"

HKEY_CURRENT_USER\Software\Microsoft\
Windows\CurrentVersion\Policies\
Explorer\DisallowRun
11 = "(²A"

HKEY_CURRENT_USER\Software\Microsoft\
Windows\CurrentVersion\Policies\
Explorer\DisallowRun
12 = "_CHAR(0x1C)_²A"

HKEY_CURRENT_USER\Software\Microsoft\
Windows\CurrentVersion\Policies\
Explorer\DisallowRun
13 = "_CHAR(0x10)_²A"

HKEY_CURRENT_USER\Software\Microsoft\
Windows\CurrentVersion\Policies\
Explorer\DisallowRun
14 = "_CHAR(0x04)_²A"

HKEY_CURRENT_USER\Software\Microsoft\
Windows\CurrentVersion\Policies\
Explorer\DisallowRun
15 = "ø±A"

HKEY_CURRENT_USER\Software\Microsoft\
Windows\CurrentVersion\Policies\
Explorer\DisallowRun
16 = "ð±A"

HKEY_CURRENT_USER\Software\Microsoft\
Windows\CurrentVersion\Policies\
Explorer\DisallowRun
17 = "ä±A"

HKEY_CURRENT_USER\Software\Microsoft\
Windows\CurrentVersion\Policies\
Explorer\DisallowRun
18 = "رA"

HKEY_CURRENT_USER\Software\Microsoft\
Windows\CurrentVersion\Policies\
Explorer\DisallowRun
19 = "̱A"

HKEY_CURRENT_USER\Software\Microsoft\
Windows\CurrentVersion\Policies\
Explorer\DisallowRun
20 = "˱A"

HKEY_CURRENT_USER\Software\Microsoft\
Windows\CurrentVersion\Policies\
Explorer\DisallowRun
21 = "°±A"

HKEY_CURRENT_USER\Software\Microsoft\
Windows\CurrentVersion\Policies\
Explorer\DisallowRun
22 = " ±A"

Other Details

This backdoor deletes itself after execution.

This report is generated via an automated analysis system.

  SOLUTION

Minimum Scan Engine:

9.750

Step 1

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

Step 2

Identify and delete files detected as BKDR_SDBOT.USCZ using either the Startup Disk or Recovery Console

[ Learn More ]

Step 3

Enable Registry Editor, Task Manager, and Folder options

[ Learn More ]
By doing this step, you also enable other applications/programs disabled by this malware/grayware/spyware.

Step 4

Delete this registry key

[ 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\Microsoft
    • Connect
  • In HKEY_LOCAL_MACHINE\Software\Microsoft\Windows\CurrentVersion
    • RunServices
  • In HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Policies\Explorer
    • DisallowRun

Step 5

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_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Run
    • SysInit = "wininit32.exe -drivers"
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Run
    • SysInit = "wininit32.exe -services"
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\RunServices
    • SysInit = "wininit32.exe -services"
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Connect
    • LastMonth = "8"

Step 6

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\SYSTEM\ControlSet001\Control\Lsa
    • restrictanonymous = "1"
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Winlogon
    • From: Shell = "Explorer.exe"
      To: Shell = ""Explorer.exe""

Step 7

Scan your computer with your Trend Micro product to delete files detected as BKDR_SDBOT.USCZ. 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 this Knowledge Base page for more information.

Step 8

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.

  • %System Root%\DRG.EXE
  • %Program Files%\win32.dll
  • %Program Files%\winsrv32.exe
  • %System Root%\JZANDEMPFUCKEDYOU.exe
  • %Common Startup%\BullGuard.lnk
  • %Common Startup%\BullGuard Update.lnk
  • %Windows%\Hello-Kitty.exe
  • %Windows%\BigMac.exe
  • %Windows%\WINMGM32.EXE
  • %Windows%\fonts\explorer.exe
  • %Windows%\fonts\rundll32.exe
  • %Windows%\litmus\winup.exe
  • %Windows%\litmus\msgsrv32.exe
  • %Windows%\litmus\MSGSRV16.exe
  • %Windows%\dllreg.exe
  • %Windows%\windrv.exe
  • %Windows%\SvcHost32.exe
  • %Windows%\Win32DLL.vbs
  • %Windows%\msbb.exe
  • %Windows%\RYFLSYCI.EXE
  • %Windows%\services.exe
  • %Windows%\WINLOGON.EXE
  • %Windows%\csrss.exe
  • %Windows%\winstart32.exe
  • %Windows%\Hwinfoq.com
  • %Windows%\Lorupscr.scr
  • %Windows%\systools.exe
  • %Windows%\systask32l.exe
  • %Windows%\avserve.exe
  • %Windows%\avserve2.exe
  • %Windows%\netskyave.exe
  • %Windows%\NsUpdate.exe
  • %System%\System32.exe
  • %System%\cmd32.exe
  • %System%\directv9x.exe
  • %System%\explorer32.exe
  • %System%\iexpIore.exe
  • %System%\LCD.exe
  • %System%\svhost.exe
  • %System%\wupdate.exe
  • %System%\SYSCFG.exe
  • %System%\wupdmngr.exe
  • %System%\restsystem.exe
  • %System%\system28.exe
  • %System%\aeagea.exe
  • %System%\picture.exe
  • %System%\ZLoad.exe
  • %System%\TCPSVS32.EXE
  • %System%\NAV32_LOADER.EXE
  • %System%\winservices.exe
  • %System%\RAVMOND.exe
  • %System%\WinHelp.exe
  • %System%\WinGate.exe
  • %System%\IEXPLORE.EXE
  • %System%\shimgapi.dll
  • %System%\load32.exe
  • %System%\vxdmgr32.exe
  • %System%\worm.exe
  • %System%\MSKernel32.vbs
  • %System%\WinFAT32.EXE
  • %System%\drvddll.exe
  • %System%\sms.exe
  • %System%\setup\config\imss.exe
  • %System%\setup\config\rmss.exe
  • %System%\setup\config\hidden32.exe
  • %System%\setup\config\FireDaemon.exe
  • %System%\setup\config\services.exe
  • %System%\ln32k.exe
  • %System%\SYSWB6.exe
  • %System%\version.exe
  • %System%\__sys.exe
  • %System%\drivers\svchost.exe
  • %System%\sysmon\sysmon.exe
  • %Windows%\mirc.exe
  • %System%\mirc.exe
  • %Windows%\mirc32.exe
  • %System%\mirc32.exe
  • %Windows%\explore.exe
  • %System%\explore.exe
  • %Windows%\psexec.exe
  • %System%\psexec.exe
  • %Windows%\rconnect.exe
  • %System%\rconnect.exe
  • %Windows%\mirc.ini
  • %System%\mirc.ini
  • %Windows%\script.ini
  • %System%\script.ini
  • %Windows%\settings.ini
  • %System%\settings.ini
  • %Temp%.scr
  • %System%\temp.scr
  • %Windows%\remote.ini
  • %System%\remote.ini
  • %Program Files%\Common Files\CMEII\Ðfž
  • %Program Files%\Common Files\GMT
  • %Program Files%\Common Files\KeenValue
  • %Program Files%\MyWay\myBar\1.bin
  • %Program Files%\Common Files\updmgr
  • %Program Files%\PerfectNav\BHO
  • %Program Files%\WhenUSearch
  • %Program Files%\Superbar


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