TROJ_INJECT.YMNME


 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:

214,997 bytes

File Type:

EXE

Memory Resident:

No

Initial Samples Received Date:

01 Sep 2016

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 deletes the following files:

  • %User Profile%\MachineKeys\3fba83d6220939250f387fa358e64c6b_6abce574-4afc-42c5-8ab9-5739a84d8a8b

(Note: %User Profile% is the current user's profile folder, which is usually C:\Documents and Settings\{user name} on Windows 2000, XP, and Server 2003, or C:\Users\{user name} on Windows Vista and 7.)

It adds the following registry keys:

HKEY_CURRENT_USER\Software\Microsoft\
Windows\CurrentVersion\Applets\
Wordpad

HKEY_CURRENT_USER\Software\Microsoft\
Windows\CurrentVersion\Applets\
Wordpad\Options

HKEY_CURRENT_USER\Software\Microsoft\
Windows\CurrentVersion\Applets\
Wordpad\Text

HKEY_CURRENT_USER\Software\Microsoft\
Windows\CurrentVersion\Applets\
Wordpad\RTF

HKEY_CURRENT_USER\Software\Microsoft\
Windows\CurrentVersion\Applets\
Wordpad\Word6

HKEY_CURRENT_USER\Software\Microsoft\
Windows\CurrentVersion\Applets\
Wordpad\Write

HKEY_CURRENT_USER\Software\Microsoft\
Windows\CurrentVersion\Applets\
Wordpad\IP

HKEY_CURRENT_USER\Software\Microsoft\
Windows\CurrentVersion\Applets\
Wordpad\Recent File List

HKEY_CURRENT_USER\Software\Microsoft\
Windows\CurrentVersion\Applets\
Wordpad\Settings

HKEY_CURRENT_USER\Software\Microsoft\
Windows\CurrentVersion\Ext\
Settings\{68AD0FD0-05B9-3CE3-079B-1EC168AD0FD0}

HKEY_CURRENT_USER\Software\Microsoft\
Windows\CurrentVersion\Ext\
Settings\{68AD0FD0-05B9-3CE3-079B-1EC168AD0FD0}\0

HKEY_CURRENT_USER\Software\WinRAR

It adds the following registry entries:

HKEY_CURRENT_USER\Software\Microsoft\
Windows\CurrentVersion\Ext\
Settings\{68AD0FD0-05B9-3CE3-079B-1EC168AD0FD0}
5B9E3CE3 = "{random values}"

HKEY_CURRENT_USER\Software\Microsoft\
Windows\CurrentVersion\Ext\
Settings\{68AD0FD0-05B9-3CE3-079B-1EC168AD0FD0}\0
¼Å£»???????ß???߬???????£¨????£³???߬???????£«??£Ç¹»Ë½»¹¹Ë¾Ñ?? = "5756"

HKEY_CURRENT_USER\Software\WinRAR
HWID = "{random values}"

HKEY_CURRENT_USER\Software\Microsoft\
Windows\CurrentVersion\Ext\
Settings\{68AD0FD0-05B9-3CE3-079B-1EC168AD0FD0}
79BC1EC1 = "{random values}"

It deletes the following registry keys:

HKEY_CURRENT_USER\Software\Microsoft\
Windows\CurrentVersion\Ext\
Settings\{68AD0FD0-05B9-3CE3-079B-1EC168AD0FD0}\1

HKEY_CURRENT_USER\Software\Microsoft\
Windows\CurrentVersion\Ext\
Settings\{68AD0FD0-05B9-3CE3-079B-1EC168AD0FD0}\2

HKEY_CURRENT_USER\Software\Microsoft\
Windows\CurrentVersion\Ext\
Settings\{68AD0FD0-05B9-3CE3-079B-1EC168AD0FD0}\3

HKEY_CURRENT_USER\Software\Microsoft\
Windows\CurrentVersion\Ext\
Settings\{68AD0FD0-05B9-3CE3-079B-1EC168AD0FD0}\4

Dropping Routine

This Trojan drops the following files:

  • %User Temp%\553703DD4DD7
  • %User Temp%\8FD4BDFF4A
  • %User Temp%\553703DD4DD7.exe
  • %User Profile%\RSA\MachineKeys
  • %User Profile%\Application Data\userdata.ini
  • %User Profile%\Application Data\CONFIRMATION.KEY
  • %User Profile%\Application Data\VAULT.KEY
  • %User Profile%\Templates\VAULT.KEY
  • %Desktop%\VAULT.KEY
  • %System Root%\VAULT.KEY
  • %User Profile%\Application Data\VAULT.hta
  • %User Profile%\Templates\VAULT.hta
  • %System Root%\VAULT.hta
  • %User Startup%\VAULT.hta
  • %Desktop%\VAULT.hta
  • %User Temp%\553703DD4DD7.ex_
  • %User Profile%\Templates\CONFIRMATION.KEY

(Note: %User Temp% is the user's temporary folder, where it usually is C:\Documents and Settings\{user name}\Local Settings\Temp on Windows 2000, Windows Server 2003, and Windows XP (32- and 64-bit); C:\Users\{user name}\AppData\Local\Temp 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 Profile% is the current user's profile folder, which is usually C:\Documents and Settings\{user name} on Windows 2000, XP, and Server 2003, or C:\Users\{user name} on Windows Vista and 7.. %Desktop% is the desktop folder, where it usually is C:\Documents and Settings\{user name}\Desktop in Windows 2000, Windows Server 2003, and Windows XP (32- and 64-bit); C:\Users\{user name}\Desktop in 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.. %System Root% is the Windows root folder, where it usually is C:\ on all Windows operating system versions.. %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.)

Other Details

This Trojan connects to the following possibly malicious URL:

  • {BLOCKED}121.171

This report is generated via an automated analysis system.

  SOLUTION

Minimum Scan Engine:

9.8

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

Delete this registry key

[ 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\Windows\CurrentVersion\Applets
    • Wordpad
  • In HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Applets\Wordpad
    • Options
  • In HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Applets\Wordpad
    • Text
  • In HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Applets\Wordpad
    • RTF
  • In HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Applets\Wordpad
    • Word6
  • In HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Applets\Wordpad
    • Write
  • In HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Applets\Wordpad
    • IP
  • In HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Applets\Wordpad
    • Recent File List
  • In HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Applets\Wordpad
    • Settings
  • In HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Ext\Settings
    • {68AD0FD0-05B9-3CE3-079B-1EC168AD0FD0}
  • In HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Ext\Settings\{68AD0FD0-05B9-3CE3-079B-1EC168AD0FD0}
    • 0
  • In HKEY_CURRENT_USER\Software
    • WinRAR

Step 3

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\Windows\CurrentVersion\Ext\Settings\{68AD0FD0-05B9-3CE3-079B-1EC168AD0FD0}
    • 5B9E3CE3 = "{random values}"
  • In HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Ext\Settings\{68AD0FD0-05B9-3CE3-079B-1EC168AD0FD0}\0
    • ¼Å£»???????ß???߬???????£¨????£³???߬???????£«??£Ç¹»Ë½»¹¹Ë¾Ñ?? = "5756"
  • In HKEY_CURRENT_USER\Software\WinRAR
    • HWID = "{random values}"
  • In HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Ext\Settings\{68AD0FD0-05B9-3CE3-079B-1EC168AD0FD0}
    • 79BC1EC1 = "{random values}"

Step 4

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.
  • %User Temp%\553703DD4DD7
  • %User Temp%\8FD4BDFF4A
  • %User Temp%\553703DD4DD7.exe
  • %User Profile%\RSA\MachineKeys
  • %User Profile%\Application Data\userdata.ini
  • %User Profile%\Application Data\CONFIRMATION.KEY
  • %User Profile%\Application Data\VAULT.KEY
  • %User Profile%\Templates\VAULT.KEY
  • %Desktop%\VAULT.KEY
  • %System Root%\VAULT.KEY
  • %User Profile%\Application Data\VAULT.hta
  • %User Profile%\Templates\VAULT.hta
  • %System Root%\VAULT.hta
  • %User Startup%\VAULT.hta
  • %Desktop%\VAULT.hta
  • %User Temp%\553703DD4DD7.ex_
  • %User Profile%\Templates\CONFIRMATION.KEY

Step 5

Scan your computer with your Trend Micro product to delete files detected as TROJ_INJECT.YMNME. 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.

Step 6

Restore this file from backup only Microsoft-related files will be restored. If this malware/grayware also deleted files related to programs that are not from Microsoft, please reinstall those programs on you computer again.

  • %User Profile%\MachineKeys\3fba83d6220939250f387fa358e64c6b_6abce574-4afc-42c5-8ab9-5739a84d8a8b

Step 7

Restore these deleted registry keys/values from backup

*Note: Only Microsoft-related keys/values will be restored. If the malware/grayware also deleted registry keys/values related to programs that are not from Microsoft, please reinstall those programs on your computer.

  • In HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Ext\Settings\{68AD0FD0-05B9-3CE3-079B-1EC168AD0FD0}
    • 1
  • In HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Ext\Settings\{68AD0FD0-05B9-3CE3-079B-1EC168AD0FD0}
    • 2
  • In HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Ext\Settings\{68AD0FD0-05B9-3CE3-079B-1EC168AD0FD0}
    • 3
  • In HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Ext\Settings\{68AD0FD0-05B9-3CE3-079B-1EC168AD0FD0}
    • 4


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