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Trojan.W97M.DLOADR.TIOIBEJH

February 06, 2020
 ALIASES:

TrojanDownloader:O97M/Obfuse.RU!MTB (Microsoft)

 PLATFORM:

Windows

 OVERALL RISK RATING:
 DAMAGE POTENTIAL:
 DISTRIBUTION POTENTIAL:
 REPORTED INFECTION:

  • 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

File Size:

162,304 bytes

File Type:

DOC

Memory Resident:

Yes

Initial Samples Received Date:

06 Feb 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.

Other System Modifications

This Trojan modifies the following file(s):

  • %Application Data%\Microsoft\Office\Word12.pip

(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_CURRENT_USER\Software\Microsoft\
CTF\TIP\{F25E9F57-2FC8-4EB3-A41A-CCE5F08541E6}\
LanguageProfile\0x00000409\{F2510000-2FC8-4EB3-A41A-CCE5F08541E6}
Enable = "1"

HKEY_CURRENT_USER\Software\Microsoft\
CTF\Assemblies\0x00000409\
{{GUID}}
Default = "{F25E9F57-2FC8-4EB3-A41A-CCE5F08541E6}"

HKEY_CURRENT_USER\Software\Microsoft\
CTF\Assemblies\0x00000409\
{{GUID}}
Profile = "{F2510000-2FC8-4EB3-A41A-CCE5F08541E6}"

HKEY_CURRENT_USER\Software\Microsoft\
CTF\Assemblies\0x00000409\
{{GUID}}
KeyboardLayout = "0"

Dropping Routine

This Trojan drops the following files:

  • %Application Data%\Microsoft\UProof\CUSTOM.DIC
  • %Application Data%\Microsoft\Office\Word12.pip
  • {malware file path and name}

(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).)

This report is generated via an automated analysis system.

  SOLUTION

Minimum Scan Engine:

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

Delete this registry value

[ Learn More ]

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\CTF\TIP\{F25E9F57-2FC8-4EB3-A41A-CCE5F08541E6}\LanguageProfile\0x00000409\{F2510000-2FC8-4EB3-A41A-CCE5F08541E6}
    • Enable = "1"
  • In HKEY_CURRENT_USER\Software\Microsoft\CTF\Assemblies\0x00000409\{{GUID}}
    • Default = "{F25E9F57-2FC8-4EB3-A41A-CCE5F08541E6}"
  • In HKEY_CURRENT_USER\Software\Microsoft\CTF\Assemblies\0x00000409\{{GUID}}
    • Profile = "{F2510000-2FC8-4EB3-A41A-CCE5F08541E6}"
  • In HKEY_CURRENT_USER\Software\Microsoft\CTF\Assemblies\0x00000409\{{GUID}}
    • KeyboardLayout = "0"

Step 3

Search and delete these components

[ Learn More ]
There may be some components 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%\Microsoft\UProof\CUSTOM.DIC
  • %Application Data%\Microsoft\Office\Word12.pip
  • {malware file path and name}

Step 4

Scan your computer with your Trend Micro product to delete files detected as Trojan.W97M.DLOADR.TIOIBEJH. 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:

Step 5

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.

    • %Application Data%\Microsoft\Office\Word12.pip


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