Trojan.Win32.WINTHEM.AA
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%\~nsu.tmp\Au_.exe" _?=%User Temp%\
- "%System%\rundll32.exe" %System%\shell32.dll,Control_RunDLL %System%\desk.cpl desk,@Themes /Action:OpenTheme /file:"%Windows%\Resources\Themes\aero.theme"
- %Windows%\Resources\Themes\aero.theme
- http://www.{BLOCKED}mepack.com/
- "%Program Files%\Internet Explorer\IEXPLORE.EXE" SCODEF:1528 CREDAT:275457 /prefetch:2
It creates the following folders:
- %System Root%\Users
- %User Temp%\Low
- %Application Data%\Microsoft\Windows\IECompatUACache
- %AppDataLocal%\Microsoft\Internet Explorer\Recovery\High\Active
- %Application Data%\Microsoft\Windows\IECompatCache
- %Application Data%\Microsoft\Windows\DNTException
- %AppDataLocal%\Microsoft\Internet Explorer\DomainSuggestions
- %User Profile%\AppData
- %Application Data%\Microsoft\Windows\PrivacIE
(Note: %System Root% is the Windows root folder, where it usually is C:\ on all Windows operating system versions.. %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).. %AppDataLocal% is the Local Application Data folder, which is usually C:\Documents and Settings\{user name}\Local Settings\Application Data on Windows 2000(32-bit), XP, and Server 2003(32-bit), or C:\Users\{user name}\AppData\Local 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).)
Other System Modifications
This Trojan deletes the following files:
- {malware file path and name}
- %User Temp%\MSI351f6.LOG
- %User Temp%\MSI11747.LOG
- %User Temp%\MSI5a7c3.LOG
- %User Temp%\chrome_installer.log
- %User Temp%\vminst.log_20170124_112725.log
- %User Temp%\StructuredQuery.log
- %User Temp%\MSIa6383.LOG
- %User Temp%\MSIcaa33.LOG
- %User Temp%\Tom.bmp
- %User Temp%\Microsoft .NET Framework 4.5.2 Setup_20161212_135033207-MSI_netfx_Full_GDR_x64.msi.txt
- %User Temp%\chrome_BITS_3756_19263\9.1_all_easylist.crx3
- %User Temp%\dd_vcredistMSI0FC1.txt
- %User Temp%\dd_vcredistUI0FC1.txt
- %User Temp%\MSIaaade.LOG
- %User Temp%\MSIbab6b.LOG
- %User Temp%\WebInstaller\ServiceUpdaterLogs.log
- %User Temp%\AdobeARM.log
- %AppDataLocal%Low\Microsoft\Internet Explorer\Services\search_{0633EE93-D776-472f-A0FF-E1416B8B2E3A}.ico
- %User Temp%\MSI97997.LOG
- %User Temp%\MSI19f3b.LOG
- %User Temp%\Adobe_ADMLogs\Adobe_GDE.log
- %User Temp%\MSI20ab9.LOG
- %User Temp%\MSId1a0.LOG
- %User Temp%\dd_vcredistUI0FD5.txt
- %User Temp%\MSI7e436.LOG
- %User Temp%\MSI733bc.LOG
- %User Temp%\dd_vcredistMSI0FD5.txt
- %User Temp%\MSIf9aa9.LOG
- %User Temp%\RGI282A.tmp-tmp
- %User Temp%\MSI547d8.LOG
- %User Temp%\MSI18620.LOG
- %User Temp%\dd_SetupUtility.txt
- %User Temp%\JavaDeployReg.log
- %User Temp%\Guest.bmp
- %User Temp%\Microsoft .NET Framework 4.5.2 Setup_20161212_135033207.html
- %User Temp%\dd_wcf_CA_smci_20161212_135109_353.txt
- %User Temp%\MSI6f768.LOG
- %User Temp%\au-descriptor-1.8.0_211-b12.xml
- %User Temp%\ASPNETSetup_00000.log
- %User Temp%\FXSAPIDebugLogFile.txt
- %User Temp%\jawshtml.html
- %User Temp%\MSI27204.LOG
- %User Temp%\MSIa2c4d.LOG
- %User Temp%\MSIb5e83.LOG
- %User Temp%\SetupExe(201701240615299E0).log
- %User Temp%\dd_NDP452-KB2901907-x86-x64-AllOS-ENU_decompression_log.txt
- %User Temp%\CR_E83EE.tmp\setup.exe
- %User Temp%\dd_wcf_CA_smci_20161212_135110_351.txt
- %User Temp%\MSIbee93.LOG
- %User Temp%\vmmsi.log_20170124_112725.log
- %User Temp%\MSIbaba9.LOG
- %User Temp%\Adobe_ADMLogs\Adobe_ADM.log
- %User Temp%\MSI25c23.LOG
- %User Temp%\wmsetup.log
- %User Temp%\AdobeSFX.log
- %User Temp%\{username}.bmp
- %User Temp%\ASPNETSetup_00001.log
- %User Temp%\jusched.log
- %User Temp%\ose00000.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).. %AppDataLocal% is the Local Application Data folder, which is usually C:\Documents and Settings\{user name}\Local Settings\Application Data on Windows 2000(32-bit), XP, and Server 2003(32-bit), or C:\Users\{user name}\AppData\Local on Windows Vista, 7, 8, 8.1, 2008(64-bit), 2012(64-bit) and 10(64-bit).)
It deletes the following folders:
- %User Temp%\acrocef_low
- %User Temp%\chrome_BITS_3756_19263
- %User Temp%\hsperfdata_{username}
- %User Temp%\Deployment
- %User Temp%\IXP000.TMP
- %User Temp%\CR_E83EE.tmp
- %User Temp%\WPDNSE
- %User Temp%\WebInstaller
- %User Temp%\Adobe_ADMLogs
- %User Temp%\mozilla-temp-files
- %User Temp%\nsk8B2F.tmp
(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).)
Dropping Routine
This Trojan drops the following files:
- %AppDataLocal%\Microsoft\Internet Explorer\DOMStore\3UYAQU1F\www.winthemepack[1].xml
- %AppDataLocal%\Microsoft\Internet Explorer\DomainSuggestions\en-US.6
- %AppDataLocal%\Microsoft\Internet Explorer\Recovery\High\Active\{9C609F3B-E493-11E9-B136-005056BC7934}.dat
- %AppDataLocal%\Microsoft\Internet Explorer\MSIMGSIZ.DAT
- %AppDataLocal%\Microsoft\Internet Explorer\Recovery\High\Active\RecoveryStore.{9C609F39-E493-11E9-B136-005056BC7934}.dat
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.WINTHEM.AA
- 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
- %AppDataLocal%\Microsoft\Internet Explorer\DOMStore\3UYAQU1F\www.winthemepack[1].xml
- %AppDataLocal%\Microsoft\Internet Explorer\DomainSuggestions\en-US.6
- %AppDataLocal%\Microsoft\Internet Explorer\Recovery\High\Active\{9C609F3B-E493-11E9-B136-005056BC7934}.dat
- %AppDataLocal%\Microsoft\Internet Explorer\MSIMGSIZ.DAT
- %AppDataLocal%\Microsoft\Internet Explorer\Recovery\High\Active\RecoveryStore.{9C609F39-E493-11E9-B136-005056BC7934}.dat
Step 4
Search and delete these folders
- %System Root%\Users
- %User Temp%\Low
- %Application Data%\Microsoft\Windows\IECompatUACache
- %AppDataLocal%\Microsoft\Internet Explorer\Recovery\High\Active
- %Application Data%\Microsoft\Windows\IECompatCache
- %Application Data%\Microsoft\Windows\DNTException
- %AppDataLocal%\Microsoft\Internet Explorer\DomainSuggestions
- %User Profile%\AppData
- %Application Data%\Microsoft\Windows\PrivacIE
Step 5
Scan your computer with your Trend Micro product to delete files detected as Trojan.Win32.WINTHEM.AA. 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}
- %User Temp%\MSI351f6.LOG
- %User Temp%\MSI11747.LOG
- %User Temp%\MSI5a7c3.LOG
- %User Temp%\chrome_installer.log
- %User Temp%\vminst.log_20170124_112725.log
- %User Temp%\StructuredQuery.log
- %User Temp%\MSIa6383.LOG
- %User Temp%\MSIcaa33.LOG
- %User Temp%\Tom.bmp
- %User Temp%\Microsoft .NET Framework 4.5.2 Setup_20161212_135033207-MSI_netfx_Full_GDR_x64.msi.txt
- %User Temp%\chrome_BITS_3756_19263\9.1_all_easylist.crx3
- %User Temp%\dd_vcredistMSI0FC1.txt
- %User Temp%\dd_vcredistUI0FC1.txt
- %User Temp%\MSIaaade.LOG
- %User Temp%\MSIbab6b.LOG
- %User Temp%\WebInstaller\ServiceUpdaterLogs.log
- %User Temp%\AdobeARM.log
- %AppDataLocal%Low\Microsoft\Internet Explorer\Services\search_{0633EE93-D776-472f-A0FF-E1416B8B2E3A}.ico
- %User Temp%\MSI97997.LOG
- %User Temp%\MSI19f3b.LOG
- %User Temp%\Adobe_ADMLogs\Adobe_GDE.log
- %User Temp%\MSI20ab9.LOG
- %User Temp%\MSId1a0.LOG
- %User Temp%\dd_vcredistUI0FD5.txt
- %User Temp%\MSI7e436.LOG
- %User Temp%\MSI733bc.LOG
- %User Temp%\dd_vcredistMSI0FD5.txt
- %User Temp%\MSIf9aa9.LOG
- %User Temp%\RGI282A.tmp-tmp
- %User Temp%\MSI547d8.LOG
- %User Temp%\MSI18620.LOG
- %User Temp%\dd_SetupUtility.txt
- %User Temp%\JavaDeployReg.log
- %User Temp%\Guest.bmp
- %User Temp%\Microsoft .NET Framework 4.5.2 Setup_20161212_135033207.html
- %User Temp%\dd_wcf_CA_smci_20161212_135109_353.txt
- %User Temp%\MSI6f768.LOG
- %User Temp%\au-descriptor-1.8.0_211-b12.xml
- %User Temp%\ASPNETSetup_00000.log
- %User Temp%\FXSAPIDebugLogFile.txt
- %User Temp%\jawshtml.html
- %User Temp%\MSI27204.LOG
- %User Temp%\MSIa2c4d.LOG
- %User Temp%\MSIb5e83.LOG
- %User Temp%\SetupExe(201701240615299E0).log
- %User Temp%\dd_NDP452-KB2901907-x86-x64-AllOS-ENU_decompression_log.txt
- %User Temp%\CR_E83EE.tmp\setup.exe
- %User Temp%\dd_wcf_CA_smci_20161212_135110_351.txt
- %User Temp%\MSIbee93.LOG
- %User Temp%\vmmsi.log_20170124_112725.log
- %User Temp%\MSIbaba9.LOG
- %User Temp%\Adobe_ADMLogs\Adobe_ADM.log
- %User Temp%\MSI25c23.LOG
- %User Temp%\wmsetup.log
- %User Temp%\AdobeSFX.log
- %User Temp%\{username}.bmp
- %User Temp%\ASPNETSetup_00001.log
- %User Temp%\jusched.log
- %User Temp%\ose00000.exe
Did this description help? Tell us how we did.