TROJ_INJECT.CWC

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.

File Size:

340,480 bytes

File Type:

EXE

Memory Resident:

Yes

Initial Samples Received Date:

21 May 2013

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:

%User Profile%\Application Data\FacbookUpdate.exe
A:\rundll32.exe

(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 creates the following folders:

%User Temp%\AppLaunch
%Program Files%\Iefg

(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, XP, and Server 2003, or C:\Users\{user name}\AppData\Local\Temp on Windows Vista and 7.. %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).)

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
FacbookUpdate = "%User Profile%\Application Data\FacbookUpdate.exe"

Other System Modifications

This Trojan modifies the following file(s):

%Application Data%\GDIPFONTCACHEV1.DAT

(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, XP, and Server 2003, or C:\Users\{user name}\AppData\Roaming on Windows Vista and 7.)

It deletes the following files:

%System%\syslog.dat
%Program Files%\Iefg\Nefghijkl.pic
%System Root%\system32.txt
%User Temp%\AppLaunch\Service.exe

(Note: %System% is the Windows system folder, which is usually C:\Windows\System32.. %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).. %System Root% is the root folder, which is usually C:\. It is also where the operating system is located.. %User Temp% is the current user's Temp folder, which is usually C:\Documents and Settings\{user name}\Local Settings\Temp on Windows 2000, XP, and Server 2003, or C:\Users\{user name}\AppData\Local\Temp on Windows Vista and 7.)

It adds the following registry keys:

HKEY_LOCAL_MACHINE\SOFTWARE\149431839

HKEY_LOCAL_MACHINE\SOFTWARE\149431839\
Parameters

HKEY_LOCAL_MACHINE\SOFTWARE\108665580

HKEY_LOCAL_MACHINE\SOFTWARE\139665270

HKEY_LOCAL_MACHINE\SOFTWARE\201475763

It adds the following registry entries:

HKEY_LOCAL_MACHINE\SOFTWARE\149431839\
Parameters
ServiceDll = "%Program Files%\Iefg\Nefghijkl.pic"

HKEY_LOCAL_MACHINE\SOFTWARE\108665580
imgsvc = "StiSvc,Defghi Klmnopqr Tuv"

HKEY_LOCAL_MACHINE\SOFTWARE\139665270\
Parameters
ServiceDll = "%Program Files%\Iefg\Nefghijkl.pic"

It modifies the following registry entries:

HKEY_CURRENT_USER\Software\Microsoft\
GDIPlus
FontCachePath = "%Application Data%"

(Note: The default value data of the said registry entry is %User Profile%\Local Settings\Application Data.)

HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\
Services\RemoteAccess\RouterManagers\
Ip
DLLPath = "%System Root%\2468300.dll"