Trojan.Win32.MALREP.THDOBBO
Windows
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
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:
- %User Temp%\CL_Debug_Log.txt e -p"JDQJndnqwdnqw2139dn21n3b312idDQDB" "%User Temp%\CR_Debug_Log.txt" -o"%User Temp%\"
- %System%\cmd.exe /c schtasks.exe /Create /XML "%User Temp%\SystemCheck.xml" /TN "System\SystemCheck"
- %System%\cmd.exe /c For /L %i In (0,0,0) Do (del "%User Temp%\05C599~1.EXE"&&timeout /t 0&&if not exist "%User Temp%\05C599~1.EXE" exit)
- timeout /t 0
- %System%\svchost.exe -k LocalServiceAndNoImpersonation
- "%System Root%\Program Files\Windows Media Player\wmpnetwk.exe"
- %System%\svchost.exe -k WerSvcGroup
(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).. %System% is the Windows system folder, where it usually is C:\Windows\System32 on all Windows operating system versions.. %System Root% is the Windows root folder, where it usually is C:\ on all Windows operating system versions.)
It creates the following folders:
- %Windows%\ServiceProfiles\NetworkService\AppData\Local\Microsoft
(Note: %Windows% is the Windows folder, where it usually is C:\Windows on all Windows operating system versions.)
Other System Modifications
This Trojan deletes the following files:
- {malware file path and name}
Dropping Routine
This Trojan drops the following files:
- %All Users Profile%\Microsoft\Network\Downloader\qmgr1.dat
- %User Temp%\asacpiex.dll
- %User Temp%\32.exe
- %User Temp%\64.exe
- %User Temp%\SystemCheck.xml
- %User Temp%\CL_Debug_Log.txt
- %All Users Profile%\Microsoft\Windows\DRM\drmstore.hds
- %Application Data%\Microsoft\Windows\Helper.exe
- %All Users Profile%\Microsoft\Windows\DRM\v3ks.sec
- %User Temp%\CR_Debug_Log.txt
- %All Users Profile%\Microsoft\Network\Downloader\qmgr0.dat
(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).. %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).)
Other Details
This Trojan connects to the following possibly malicious URL:
- http://www.{BLOCKED}oft.com/pki/certs/MicRooCerAut_2010-06-23.crt
- http://{BLOCKED}t.ru/1tMZr7
- http://{BLOCKED}er.org
This report is generated via an automated analysis system.
SOLUTION
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.MALREP.THDOBBO
- 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.
- 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.
- If the detected file is not displayed in either Windows Task Manager or Process Explorer, continue doing the next steps.
Step 3
Search and delete these components
- %All Users Profile%\Microsoft\Network\Downloader\qmgr1.dat
- %User Temp%\asacpiex.dll
- %User Temp%\32.exe
- %User Temp%\64.exe
- %User Temp%\SystemCheck.xml
- %User Temp%\CL_Debug_Log.txt
- %All Users Profile%\Microsoft\Windows\DRM\drmstore.hds
- %Application Data%\Microsoft\Windows\Helper.exe
- %All Users Profile%\Microsoft\Windows\DRM\v3ks.sec
- %User Temp%\CR_Debug_Log.txt
- %All Users Profile%\Microsoft\Network\Downloader\qmgr0.dat
Step 4
Search and delete this folder
- %Windows%\ServiceProfiles\NetworkService\AppData\Local\Microsoft
Step 5
Scan your computer with your Trend Micro product to delete files detected as Trojan.Win32.MALREP.THDOBBO. 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 6
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.
- {malware file path and name}
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