Trojan.W97M.CVE20120158.AFJT
Exploit:Win32/CVE-2012-0158 (Microsoft); Exploit-CVE2012-0158.f!rtf (McAfee); Trojan.Dropper (Symantec); Exploit.MSWord.CVE-2012-0158.ag (Kaspersky); Exp/20120158-A (Sophos); Exploit.RTF.CVE-2012-0158 (v) (Sunbelt)
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
279,183 bytes
RTF
Yes
28 Oct 2019
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 copies of itself into the affected system:
- {malware path and file name}.doc
It adds the following processes:
- conhost.exe -local
- %Program Files%\Microsoft Office\Office12\WINWORD.EXE Wor.doc
- "%Program Files%\COMMON~1\MICROS~1\DW\DW20.EXE" -x -s 1008
- %Program Files%\Common Files\Microsoft Shared\office12\OffDiag.exe /SOURCE 1 /LCID 1033 /WAITPID 1172
(Note: %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 Trojan adds the following registry keys:
HKEY_CURRENT_USER\Software\Microsoft\
Shared Tools\Proofing Tools\Grammar\
MSGrammar\3.0\2057
It adds the following registry entries:
HKEY_CURRENT_USER\Software\Microsoft\
Shared Tools\Proofing Tools\Grammar\
MSGrammar\3.0\2057
Options Version = "1"
Dropping Routine
This Trojan drops the following files:
- %User Temp%\Wor.doc
- %Application Data%\Microsoft\UProof\ExcludeDictionaryEN0409.lex
- %User Temp%\29289070.cvr
- %User Temp%\conhost.exe
- %Application Data%\Microsoft\UProof\CUSTOM.DIC
- %User Temp%\29289164.od
- %All Users Profile%\Microsoft\OFFICE\DATA\opa12.dat
- %Application Data%\Microsoft\Templates\Normal.dotm
(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).. %All Users Profile% is the common user's profile folder, which is usually C:\Documents and Settings\All Users on Windows 2000(32-bit), XP, and Server 2003(32-bit), or C:\ProgramData 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 Trojan.W97M.CVE20120158.AFJT
- 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 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\Shared Tools\Proofing Tools\Grammar\MSGrammar\3.0
- 2057
Step 4
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\Shared Tools\Proofing Tools\Grammar\MSGrammar\3.0\2057
- Options Version = "1"
Step 5
Search and delete these components
- %User Temp%\Wor.doc
- %Application Data%\Microsoft\UProof\ExcludeDictionaryEN0409.lex
- %User Temp%\29289070.cvr
- %User Temp%\conhost.exe
- %Application Data%\Microsoft\UProof\CUSTOM.DIC
- %User Temp%\29289164.od
- %All Users Profile%\Microsoft\OFFICE\DATA\opa12.dat
- %Application Data%\Microsoft\Templates\Normal.dotm
Step 6
Scan your computer with your Trend Micro product to delete files detected as Trojan.W97M.CVE20120158.AFJT. 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:
Did this description help? Tell us how we did.