BKDR_INJECT.BJT

This malware does not have any propagation routine.

This backdoor arrives as an attachment to email messages spammed by other malware/grayware or malicious users. It arrives on a system as a file dropped by other malware or as a file downloaded unknowingly by users when visiting malicious sites.

Arrival Details

This backdoor arrives as an attachment to email messages spammed by other malware/grayware or malicious users.

It 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 backdoor drops the following copies of itself into the affected system:

• %Windows%:adobeupdate.exe (ADS, if logged in as an administrator)
• %User Profile%\Application Data\adobeupdate.exe (if not logged in as an administrator)

(Note: %Windows% is the Windows folder, which is usually C:\Windows or C:\WINNT.. %User Profile% is the current user's profile folder, which is usually C:\Windows\Profiles\{user name} on Windows 98 and ME, C:\WINNT\Profiles\{user name} on Windows NT, and C:\Documents and Settings\{user name} on Windows 2000, XP, and Server 2003.)

It adds the following mutexes to ensure that only one of its copies runs at any one time:

• lau's PI

NOTES:

This malware arrives with the following file, which it needs to execute properly:

• %User Temp%\lock.txt – encrypted malware codes, non malicious by itself

(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.)

It copies the file %User Temp%\LOCK.TXT to the following locations for backup:

• %Program Files%\Common Files\ODBC\ODBC.dll
• %Windows%\Java\jsp.cer

(Note: %Program Files% is the default Program Files folder, usually C:\Program Files.)

Autostart Technique

This backdoor adds the following registry entries to enable its automatic execution at every system startup:

Logged in as an administrator:

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Active Setup\Installed Components\{8E12AADC-A55E-3FBE-4C6E-6B6EAC7CAFB5}
StubPath = "%Windows%:adobeupdate.exe"

Not logged in as an administrator:

HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Run
{8E12AADC-A55E-3FBE-4C6E-6B6EAC7CAFB5} = "%User Profile%\Application Data\adobeupdate.exe"

Propagation

This malware does not have any propagation routine.

Backdoor Routine

It checks the following registry entry to get the system's default web browser:

HKEY_CLASSES_ROOT\http\shell\open\command

It injects codes in the hidden default browser to perform its backdoor routines.

It connects to its following C&C server using port 80:

• {BLOCKED}.{BLOCKED}.215.58

It has the following backdoor capabilities:

• Capture screen shots
• Delete, search, and upload files
• Download and inject codes to processes
• Log keystrokes and active window
• Perform a shell command
• Send system information (IP address, computer name, user name, operating system)
• Update/Remove the malware

Rootkit Capabilities

It does not have rootkit capabilities.

Other Details

It does not exploit any vulnerability.