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BKDR_MICROCEL.A

November 28, 2012
 Analysis by: Rika Joi Gregorio
 PLATFORM:

Windows 2000, Windows XP, Windows Server 2003

 OVERALL RISK RATING:
 DAMAGE POTENTIAL:
 DISTRIBUTION POTENTIAL:
 REPORTED INFECTION:

  • Threat Type: Backdoor

  • Destructiveness: No

  • Encrypted:

  • In the wild: Yes

  OVERVIEW

This backdoor arrives as a component bundled with malware/grayware packages.

  TECHNICAL DETAILS

File Size:

753,776 bytes

File Type:

DLL

Memory Resident:

Yes

Initial Samples Received Date:

27 Nov 2012

Arrival Details

This backdoor arrives as a component bundled with malware/grayware packages.

Installation

This backdoor drops the following component file(s):

  • %Temp%\~tmp{random}.old

(Note: %Temp% is the Windows Temporary folder, which is usually C:\Windows\Temp.)

Autostart Technique

This backdoor registers itself as a system service to ensure its automatic execution at every system startup by adding the following registry entries:

HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\
Services\6to4\Parameters
ServiceDll = {malware path}\{malware name}.dll

Other System Modifications

This backdoor adds the following registry entries:

HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\
Control\Session Manager
PendingFileRenameOperations = %Temp%\~tmp{random}.old

Other Details

This backdoor connects to the following possibly malicious URL:

  • {BLOCKED}1.china.com
  • {BLOCKED}.{BLOCKED}.239.7
  • {BLOCKED}.{BLOCKED}.163.8