X97M_DIVI.B
X97M/Divi.R (FORTINET)
Windows
Threat Type: Virus
Destructiveness: No
Encrypted: No
In the wild: Yes
OVERVIEW
Downloaded from the Internet, Dropped by other malware
This Virus 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
237,056 bytes
XLS
No
07 Mar 2023
Modifies system registry
Arrival Details
This Virus 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 Virus drops the following files:
- %Application Data%\Microsoft\Excel\XLSTART\874.XLS
(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).)
Other System Modifications
This Virus adds the following registry entries as part of its installation routine:
HKEY_CURRENT_USER\Software\Microsoft\
Windows\CurrentVersion\Policies\
System
DisableRegistryTools = 1
It adds the following registry keys as part of its installation routine:
HKEY_CURRENT_USER\Software\Microsoft\
Windows\CurrentVersion\Policies\
System
It modifies the following registry entries:
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Internet Explorer\MAIN
Start Page = http://{BLOCKED}u.taobao.com
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Internet Explorer\Main
Start Page = http://{BLOCKED}u.taobao.com
Other Details
This Virus does the following:
- It inserts malicious macro commands in "ThisWorkbook" of other Excel files.
- It will remain active every time Excel is launched, infecting any new workbooks created and previously saved workbooks when they are opened.
- It checks for a file named "KING.XLS" in the Excel startup path:
- If it exists,
- It copies a sheet named "KING" from "KING.XLS" and paste it as the first sheet in the destination Excel workbook.
- It sets the copied sheet to hidden.
- It assigns a macro from "KING.XLS" in the destination Excel workbook for persistence
- If it doesn't exists,
- It drops the following files: %Application Data%\Microsoft\Excel\XLSTART\KING.XLS
- If it exists,
(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).)
SOLUTION
9.800
7.192.13
24 May 2010
7.193.00
27 May 2010
Step 1
Trend Micro Predictive Machine Learning detects and blocks malware at the first sign of its existence, before it executes on your system. When enabled, your Trend Micro product detects this malware under the following machine learning name:
- Downloader.VBA.TRX.XXVBAF01FF038
Step 2
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 3
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 4
Enable Registry Editor, Task Manager, and Folder options
Step 5
Restore this modified registry value
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\SOFTWARE\Microsoft\Internet Explorer\MAIN
- Start Page = http[://]{BLOCKED}u[.]taobao[.]com
- Start Page = http[://]{BLOCKED}u[.]taobao[.]com
- In HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Internet Explorer\Main
- Start Page = http[://]{BLOCKED}u[.]taobao[.]com
- Start Page = http[://]{BLOCKED}u[.]taobao[.]com
Step 6
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\Windows\CurrentVersion\Policies\
- System
- System
Step 7
Search and delete these files
- %Application Data%\Microsoft\Excel\XLSTART\874.XLS
- %Application Data%\Microsoft\Excel\XLSTART\KING.XLS
Step 8
Scan your computer with your Trend Micro product to delete files detected as X97M_DIVI.B. 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:
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