TROJ_MDROPPER.G
Windows 2000, Windows Server 2003, Windows XP (32-bit, 64-bit), Windows Vista (32-bit, 64-bit), Windows 7 (32-bit, 64-bit)
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
1,070,080 bytes
EXE
No
05 Sep 2014
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 creates the following folders:
- %System%\scan
- download
- logs
- sounds
(Note: %System% is the Windows system folder, which is usually C:\Windows\System32.)
Other System Modifications
This Trojan deletes the following files:
- %System%\scan\hook.bat
- %System%\scan\TMP2.$$$
(Note: %System% is the Windows system folder, which is usually C:\Windows\System32.)
It adds the following registry keys:
HKEY_CURRENT_USER\Software\WinRAR SFX
HKEY_LOCAL_MACHINE\Software\The Silicon Realms Toolworks\
Armadillo
HKEY_CURRENT_USER\Software\mIRC
HKEY_LOCAL_MACHINE\Software\Microsoft\
Windows\CurrentVersion\Uninstall\
mIRC
HKEY_CLASSES_ROOT\.cha
HKEY_CLASSES_ROOT\.chat
HKEY_CLASSES_ROOT\ChatFile
HKEY_CLASSES_ROOT\ChatFile\DefaultIcon
HKEY_CLASSES_ROOT\ChatFile\Shell\
open\command
HKEY_CLASSES_ROOT\ChatFile\Shell\
open\ddeexec
HKEY_CLASSES_ROOT\ChatFile\Shell\
open\ddeexec\Application
HKEY_CLASSES_ROOT\ChatFile\Shell\
open\ddeexec\ifexec
HKEY_CLASSES_ROOT\ChatFile\Shell\
open\ddeexec\Topic
HKEY_LOCAL_MACHINE\Software\Classes\
irc
HKEY_LOCAL_MACHINE\Software\Classes\
irc\DefaultIcon
HKEY_LOCAL_MACHINE\Software\Classes\
irc\Shell\open\
command
HKEY_LOCAL_MACHINE\Software\Classes\
irc\Shell\open\
ddeexec
HKEY_LOCAL_MACHINE\Software\Classes\
irc\Shell\open\
ddeexec\Application
HKEY_LOCAL_MACHINE\Software\Classes\
irc\Shell\open\
ddeexec\ifexec
HKEY_LOCAL_MACHINE\Software\Classes\
irc\Shell\open\
ddeexec\Topic
It adds the following registry entries:
HKEY_CURRENT_USER\Software\WinRAR SFX
C%%WINDOWS%system32%scan = "%System%\scan"
HKEY_LOCAL_MACHINE\SOFTWARE\The Silicon Realms Toolworks\
Armadillo
{06DDC3B8D534FB67A} = "{random values}"
HKEY_CURRENT_USER\Software\mIRC
DateUsed = "1409721942"
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows\CurrentVersion\Uninstall\
mIRC
DisplayName = "mIRC"
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows\CurrentVersion\Uninstall\
mIRC
UninstallString = "%System%\scan\svchost.exe -uninstall"
HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
irc
EditFlags = "{random values}"
HKEY_CURRENT_USER\Software\Microsoft\
Microsoft Agent
VoiceEnabled = "1"
HKEY_CURRENT_USER\Software\Microsoft\
Microsoft Agent
UseVoiceTips = "1"
HKEY_CURRENT_USER\Software\Microsoft\
Microsoft Agent
KeyHoldHotKey = "91"
HKEY_CURRENT_USER\Software\Microsoft\
Microsoft Agent
UseBeepSRPrompt = "1"
HKEY_CURRENT_USER\Software\Microsoft\
Microsoft Agent
SRTimerDelay = "7d"
HKEY_CURRENT_USER\Software\Microsoft\
Microsoft Agent
SRModeID = "{random values}"
HKEY_CURRENT_USER\Software\Microsoft\
Microsoft Agent
EnableSpeaking = "1"
HKEY_CURRENT_USER\Software\Microsoft\
Microsoft Agent
UseBalloon = "1"
HKEY_CURRENT_USER\Software\Microsoft\
Microsoft Agent
UseCharacterFont = "1"
HKEY_CURRENT_USER\Software\Microsoft\
Microsoft Agent
UseSoundEffects = "1"
HKEY_CURRENT_USER\Software\Microsoft\
Microsoft Agent
SpeakingSpeed = "5"
HKEY_CURRENT_USER\Software\Microsoft\
Microsoft Agent
PropertySheetX = "f423f"
HKEY_CURRENT_USER\Software\Microsoft\
Microsoft Agent
PropertySheetY = "f423f"
HKEY_CURRENT_USER\Software\Microsoft\
Microsoft Agent
PropertySheetWidth = "0"
HKEY_CURRENT_USER\Software\Microsoft\
Microsoft Agent
PropertySheetHeight = "0"
HKEY_CURRENT_USER\Software\Microsoft\
Microsoft Agent
PropertySheetPage = "0"
HKEY_CURRENT_USER\Software\Microsoft\
Microsoft Agent
CommandsWindowLeft = "ffffffff"
HKEY_CURRENT_USER\Software\Microsoft\
Microsoft Agent
CommandsWindowTop = "ffffffff"
HKEY_CURRENT_USER\Software\Microsoft\
Microsoft Agent
CommandsWindowWidth = "c8"
HKEY_CURRENT_USER\Software\Microsoft\
Microsoft Agent
CommandsWindowHeight = "c8"
HKEY_CURRENT_USER\Software\Microsoft\
Microsoft Agent
CommandsWindowLocationSet = "0"
Dropping Routine
This Trojan drops the following files:
- remote.ini
- hook.bat
- services.exe
- aliases.ini
- hex.exe
- mirc.ini
- nt.dll
- moo.dll
- moodll.mrc
- svchost.exe
- x.mrc
- %System%\scan\TMP1.$$$
(Note: %System% is the Windows system folder, which is usually C:\Windows\System32.)
This report is generated via an automated analysis system.
SOLUTION
9.700
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
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
- WinRAR SFX
- In HKEY_LOCAL_MACHINE\Software\The Silicon Realms Toolworks
- Armadillo
- In HKEY_CURRENT_USER\Software
- mIRC
- In HKEY_LOCAL_MACHINE\Software\Microsoft\Windows\CurrentVersion\Uninstall
- mIRC
- In HKEY_CLASSES_ROOT
- .cha
- In HKEY_CLASSES_ROOT
- .chat
- In HKEY_CLASSES_ROOT
- ChatFile
- In HKEY_CLASSES_ROOT\ChatFile
- DefaultIcon
- In HKEY_CLASSES_ROOT\ChatFile\Shell\open
- command
- In HKEY_CLASSES_ROOT\ChatFile\Shell\open
- ddeexec
- In HKEY_CLASSES_ROOT\ChatFile\Shell\open\ddeexec
- Application
- In HKEY_CLASSES_ROOT\ChatFile\Shell\open\ddeexec
- ifexec
- In HKEY_CLASSES_ROOT\ChatFile\Shell\open\ddeexec
- Topic
- In HKEY_LOCAL_MACHINE\Software\Classes
- irc
- In HKEY_LOCAL_MACHINE\Software\Classes\irc
- DefaultIcon
- In HKEY_LOCAL_MACHINE\Software\Classes\irc\Shell\open
- command
- In HKEY_LOCAL_MACHINE\Software\Classes\irc\Shell\open
- ddeexec
- In HKEY_LOCAL_MACHINE\Software\Classes\irc\Shell\open\ddeexec
- Application
- In HKEY_LOCAL_MACHINE\Software\Classes\irc\Shell\open\ddeexec
- ifexec
- In HKEY_LOCAL_MACHINE\Software\Classes\irc\Shell\open\ddeexec
- Topic
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_CURRENT_USER\Software\WinRAR SFX
- C%%WINDOWS%system32%scan = "%System%\scan"
- In HKEY_LOCAL_MACHINE\SOFTWARE\The Silicon Realms Toolworks\Armadillo
- {06DDC3B8D534FB67A} = "{random values}"
- In HKEY_CURRENT_USER\Software\mIRC
- DateUsed = "1409721942"
- In HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Uninstall\mIRC
- DisplayName = "mIRC"
- In HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Uninstall\mIRC
- UninstallString = "%System%\scan\svchost.exe -uninstall"
- In HKEY_LOCAL_MACHINE\SOFTWARE\Classes\irc
- EditFlags = "{random values}"
- In HKEY_CURRENT_USER\Software\Microsoft\Microsoft Agent
- VoiceEnabled = "1"
- In HKEY_CURRENT_USER\Software\Microsoft\Microsoft Agent
- UseVoiceTips = "1"
- In HKEY_CURRENT_USER\Software\Microsoft\Microsoft Agent
- KeyHoldHotKey = "91"
- In HKEY_CURRENT_USER\Software\Microsoft\Microsoft Agent
- UseBeepSRPrompt = "1"
- In HKEY_CURRENT_USER\Software\Microsoft\Microsoft Agent
- SRTimerDelay = "7d"
- In HKEY_CURRENT_USER\Software\Microsoft\Microsoft Agent
- SRModeID = "{random values}"
- In HKEY_CURRENT_USER\Software\Microsoft\Microsoft Agent
- EnableSpeaking = "1"
- In HKEY_CURRENT_USER\Software\Microsoft\Microsoft Agent
- UseBalloon = "1"
- In HKEY_CURRENT_USER\Software\Microsoft\Microsoft Agent
- UseCharacterFont = "1"
- In HKEY_CURRENT_USER\Software\Microsoft\Microsoft Agent
- UseSoundEffects = "1"
- In HKEY_CURRENT_USER\Software\Microsoft\Microsoft Agent
- SpeakingSpeed = "5"
- In HKEY_CURRENT_USER\Software\Microsoft\Microsoft Agent
- PropertySheetX = "f423f"
- In HKEY_CURRENT_USER\Software\Microsoft\Microsoft Agent
- PropertySheetY = "f423f"
- In HKEY_CURRENT_USER\Software\Microsoft\Microsoft Agent
- PropertySheetWidth = "0"
- In HKEY_CURRENT_USER\Software\Microsoft\Microsoft Agent
- PropertySheetHeight = "0"
- In HKEY_CURRENT_USER\Software\Microsoft\Microsoft Agent
- PropertySheetPage = "0"
- In HKEY_CURRENT_USER\Software\Microsoft\Microsoft Agent
- CommandsWindowLeft = "ffffffff"
- In HKEY_CURRENT_USER\Software\Microsoft\Microsoft Agent
- CommandsWindowTop = "ffffffff"
- In HKEY_CURRENT_USER\Software\Microsoft\Microsoft Agent
- CommandsWindowWidth = "c8"
- In HKEY_CURRENT_USER\Software\Microsoft\Microsoft Agent
- CommandsWindowHeight = "c8"
- In HKEY_CURRENT_USER\Software\Microsoft\Microsoft Agent
- CommandsWindowLocationSet = "0"
Step 4
Search and delete these components
- remote.ini
- hook.bat
- services.exe
- aliases.ini
- hex.exe
- mirc.ini
- nt.dll
- moo.dll
- moodll.mrc
- svchost.exe
- x.mrc
- %System%\scan\TMP1.$
*Note: The file name input box title varies depending on the Windows version (e.g. Search for files or folders named or All or part of the file name.).
• For Windows Vista, Windows 7, Windows Server 2003 (R2), Windows 8, Windows 8.1, and Windows Server 2012 (R2):
- Open a Windows Explorer window.
- For Windows Vista, 7, and Server 2008 (R2) users, click Start>Computer.
- For Windows 8, 8.1, and Server 2012 (R2) users, right-click on the lower left corner of the screen,then click File Explorer.
- In the Search Computer/This PC input box, type:
- remote.ini
- hook.bat
- services.exe
- aliases.ini
- hex.exe
- mirc.ini
- nt.dll
- moo.dll
- moodll.mrc
- svchost.exe
- x.mrc
- %System%\scan\TMP1.$
- Once located, select the file then press SHIFT+DELETE to delete it.
*Note: Read the following Microsoft page if these steps do not work on Windows 7.
Step 5
Search and delete these folders
- %System%\scan
- download
- logs
- sounds
Step 6
Scan your computer with your Trend Micro product to delete files detected as TROJ_MDROPPER.G. 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 7
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.
- %System%\scan\hook.bat
- %System%\scan\TMP2.$
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