Trojan.Win32.MSISTAH.C
RDN/Ransom (McAfee); HEUR:Trojan-Ransom.Win32.MyxaH.gen (Kaspersky)
Windows
![](/vinfo/imgFiles/legend.jpg)
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
384,472 bytes
EXE
Yes
08 Jan 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%\cmd.exe /c "COPY /Y /B "{malware file path and name}" "%Application Data%\Identities\{3D0FBFE3-9E5C-4F14-8D00-F0C8FEFA78BA}\diskraid.exe""
- %System%\cmd.exe /c "COPY /Y /B "%User Temp%\9e89d208.lnk" "%User Startup%\diskraid.lnk""
- %System%\lsass.exe
(Note: %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).. %User Startup% is the current user's Startup folder, which is usually C:\Windows\Profiles\{user name}\Start Menu\Programs\Startup on Windows 98 and ME, C:\WINNT\Profiles\{user name}\Start Menu\Programs\Startup on Windows NT, C:\Documents and Settings\{User name}\Start Menu\Programs\Startup on Windows 2003(32-bit), XP and 2000(32-bit), or C:\Users\{user name}\AppData\Roaming\Microsoft\Windows\Start Menu\Programs\Startup on Windows Vista, 7, 8, 8.1, 2008(64-bit), 2012(64-bit), 10(64-bit).)
Autostart Technique
This Trojan drops the following file(s) in the Windows User Startup folder to enable its automatic execution at every system startup:
- %User Startup%\diskraid.lnk
(Note: %User Startup% is the current user's Startup folder, which is usually C:\Windows\Profiles\{user name}\Start Menu\Programs\Startup on Windows 98 and ME, C:\WINNT\Profiles\{user name}\Start Menu\Programs\Startup on Windows NT, C:\Documents and Settings\{User name}\Start Menu\Programs\Startup on Windows 2003(32-bit), XP and 2000(32-bit), or C:\Users\{user name}\AppData\Roaming\Microsoft\Windows\Start Menu\Programs\Startup on Windows Vista, 7, 8, 8.1, 2008(64-bit), 2012(64-bit), 10(64-bit).)
Other System Modifications
This Trojan modifies the following file(s):
- %System%\drivers\etc\hosts
(Note: %System% is the Windows system folder, where it usually is C:\Windows\System32 on all Windows operating system versions.)
It adds the following registry keys:
HKEY_CURRENT_USER\Software\Microsoft\
VisualStudio\11.0_Config\EnterpriseTools\
QualityTools\TestTypes\{{GUID}}\
TestTypeExtensions\TestCaseClassAttribute
It adds the following registry entries:
HKEY_CURRENT_USER\Software\Microsoft\
VisualStudio\11.0_Config\EnterpriseTools\
QualityTools\TestTypes\{{GUID}}\
TestTypeExtensions\TestCaseClassAttribute
AttributeProvider = "TestCaseExtension.TestCaseClassAttribute,TestCaseExtension"
Dropping Routine
This Trojan drops the following files:
- %User Temp%\9e89d208.lnk
- %Application Data%\Identities\{3D0FBFE3-9E5C-4F14-8D00-F0C8FEFA78BA}\diskraid.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).. %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).)
This report is generated via an automated analysis system.
SOLUTION
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
Restart in Safe Mode
Step 3
Identify and terminate files detected as Trojan.Win32.MSISTAH.C
- 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 4
Delete this registry key
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\VisualStudio\11.0_Config\EnterpriseTools\QualityTools\TestTypes\{{GUID}}\TestTypeExtensions
- TestCaseClassAttribute
Step 5
Delete this registry value
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\VisualStudio\11.0_Config\EnterpriseTools\QualityTools\TestTypes\{{GUID}}\TestTypeExtensions\TestCaseClassAttribute
- AttributeProvider = "TestCaseExtension.TestCaseClassAttribute,TestCaseExtension"
Step 6
Search and delete these components
- %User Temp%\9e89d208.lnk
- %Application Data%\Identities\{3D0FBFE3-9E5C-4F14-8D00-F0C8FEFA78BA}\diskraid.exe
Step 7
Restart in normal mode and scan your computer with your Trend Micro product for files detected as Trojan.Win32.MSISTAH.C. 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 deleted/modified files and/or registry entries from backup
*Note: Only Microsoft-related files/keys/values will be restored. If this malware/grayware also deleted registry keys/values related to programs that are not from Microsoft, please reinstall those programs on your computer.
- %System%\drivers\etc\hosts
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