Virus.X97M.MAILCAB.A
Virus:X97M/Mailcab.A (Microsoft); W97M/Downloader.bqa (McAfee); XM.Mailcab@mm (Symantec); Virus.MSExcel.Agent.f (Kaspersky); XM97/MailCab-A (Sophos); Virus.MSExcel.Mailcab.a (v) (Sunbelt)
Windows
Threat Type: File infector
Destructiveness: No
Encrypted:
In the wild: Yes
OVERVIEW
This File infector 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
252,928 bytes
XLS
Yes
15 Jun 2020
Arrival Details
This File infector 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 File infector adds the following processes:
- %System%\cmd.exe /c attrib -S -h "%Application Data%\Microsoft\Excel\XLSTART\K4.XLS"
- %System%\cmd.exe /c Del /F /Q "%Application Data%\Microsoft\Excel\XLSTART\K4.XLS"
- %System%\cmd.exe /c RD /S /Q "%Application Data%\Microsoft\Excel\XLSTART\K4.XLS"
- "%Program Files%\COMMON~1\MICROS~1\DW\DW20.EXE" -x -s 1340
- %Program Files%\Common Files\Microsoft Shared\office12\OffDiag.exe /SOURCE 1 /LCID 1033 /WAITPID 1340
- %System%\svchost.exe -k netsvcs
(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).. %Program Files% is the default Program Files folder, usually C:\Program Files in Windows 2000(32-bit), Server 2003(32-bit), XP, Vista(64-bit), 7, 8, 8.1, 2008(64-bit), 2012(64-bit) and 10(64-bit) , or C:\Program Files (x86) in Windows XP(64-bit), Vista(64-bit), 7(64-bit), 8(64-bit), 8.1(64-bit), 2008(64-bit), 2012(64-bit) and 10(64-bit).)
Other System Modifications
This File infector deletes the following folders:
- %Application Data%\Microsoft\Excel\XLSTART\k4.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).)
It adds the following registry entries:
HKEY_LOCAL_MACHINE\SOFTWARE\Wow6432Node\
Microsoft\Office\12.0\
Excel\Security
AccessVBOM = "1"
HKEY_LOCAL_MACHINE\SOFTWARE\Wow6432Node\
Microsoft\Office\12.0\
Excel\Security
Level = "1"
Dropping Routine
This File infector drops the following files:
- %User Temp%\6129265.od
- %Application Data%\Microsoft\Excel\XLSTART\k4.xls
- {malware file path and name}
- %User Temp%\6129249.cvr
(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
Identify and terminate files detected as Virus.X97M.MAILCAB.A
- 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
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_LOCAL_MACHINE\SOFTWARE\Wow6432Node\Microsoft\Office\12.0\Excel\Security
- AccessVBOM = "1"
- In HKEY_LOCAL_MACHINE\SOFTWARE\Wow6432Node\Microsoft\Office\12.0\Excel\Security
- Level = "1"
Step 4
Search and delete these components
- %User Temp%\6129265.od
- %Application Data%\Microsoft\Excel\XLSTART\k4.xls
- {malware file path and name}
- %User Temp%\6129249.cvr
Step 5
Scan your computer with your Trend Micro product to clean files detected as Virus.X97M.MAILCAB.A. 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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