TROJ_YABINDER.20
TrojanDropper:Win32/Yabinder.2_0 (Microsoft); MultiDropper-DC (McAfee); W32.Slackor.dr (Symantec); PAK:UPX, Trojan-Dropper.Win32.Agent.bv, Trojan-Dropper.Win32.Yabinder.c (Kaspersky); Trojan.Win32.Generic.pak!cobra (Sunbelt); TrojanDropper.Yabinder.2.0 (FSecure)
Windows 2000, Windows XP, Windows Server 2003
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.
It deletes the initially executed copy of itself.
TECHNICAL DETAILS
82,500 bytes
EXE
Yes
18 Feb 2012
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:
- %User Profile%\Application Data\Dir
(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.)
Autostart Technique
This Trojan adds the following registry entries to enable its automatic execution at every system startup:
HKEY_CURRENT_USER\Software\Microsoft\
Windows\CurrentVersion\Run
ctfnom = "%User Profile%\Dir\ctfnom.exe"
Other System Modifications
This Trojan adds the following registry keys:
HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\
Control\MediaResources\msvideo
Dropping Routine
This Trojan drops the following files:
- %System Root%\Execting.Exe
- %Program Files%\LimeWire\Shared\Mirc.exe
- %Program Files%\eDonkey2000\Mirc.exe
- %Program Files%\eMule\Incoming\Mirc.exe
- %Program Files%\Morpheus\My Shared Folder\Mirc.exe
- %Program Files%\Bearshare\Shared\kespersky Keys Generator.exee
- %Program Files%\Kazaa\My Shared Folder\Mirc.exe
- %Program Files%\Ares\My Shared Folder\Mirc.exe
- %User Profile%\Dir\ctfnom.exe
- %User Profile%\Dir\Dated.dat
- A:\Mirc.exe
(Note: %System Root% is the root folder, which is usually C:\. It is also where the operating system is located.. %Program Files% is the default Program Files folder, usually C:\Program Files in Windows 2000, Server 2003, and XP (32-bit), Vista (32-bit), and 7 (32-bit), or C:\Program Files (x86) in Windows XP (64-bit), Vista (64-bit), and 7 (64-bit).. %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.)
Other Details
This Trojan deletes the initially executed copy of itself
This report is generated via an automated analysis system.
SOLUTION
9.200
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
Restart in Safe Mode
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_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\MediaResources
- msvideo
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\Windows\CurrentVersion\Run
- ctfnom = "%User Profile%\Dir\ctfnom.exe"
Step 5
Search and delete these components
- %System Root%\Execting.Exe
- %Program Files%\LimeWire\Shared\Mirc.exe
- %Program Files%\eDonkey2000\Mirc.exe
- %Program Files%\eMule\Incoming\Mirc.exe
- %Program Files%\Morpheus\My Shared Folder\Mirc.exe
- %Program Files%\Bearshare\Shared\kespersky Keys Generator.exee
- %Program Files%\Kazaa\My Shared Folder\Mirc.exe
- %Program Files%\Ares\My Shared Folder\Mirc.exe
- %User Profile%\Dir\ctfnom.exe
- %User Profile%\Dir\Dated.dat
- A:\Mirc.exe
Step 6
Search and delete this folder
- %User Profile%\Application Data\Dir
Step 7
Restart in normal mode and scan your computer with your Trend Micro product for files detected as TROJ_YABINDER.20. 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.
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