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BKDR_TDSS.SMD

February 25, 2011
 Analysis by: Michael Cabel
 PLATFORM:

Windows 2000, XP, Server 2003

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

  • Threat Type: Backdoor

  • Destructiveness: No

  • Encrypted: No

  • In the wild: Yes

  OVERVIEW

This backdoor deletes itself after execution.

  TECHNICAL DETAILS

File Size:

Varies

File Type:

PE

Memory Resident:

Yes

Initial Samples Received Date:

27 Sep 2010

Payload:

Drops files

Installation

This backdoor drops the following component file(s):

  • %System%\spool\prtprocs\w32x86\{Random File Name}.dll - also detected as BKDR_TDSS.SMD
  • %Temp%\{Random File Name}.sys - detected as TROJ_TDSS.ZZA
  • %User Temp%\{Random File Name} - also detected as BKDR_TDSS.SMD

(Note: %System% is the Windows system folder, which is usually C:\Windows\System on Windows 98 and ME, C:\WINNT\System32 on Windows NT and 2000, or C:\Windows\System32 on Windows XP and Server 2003.. %Temp% is the Windows Temporary folder, which is usually C:\Windows\Temp or C:\WINNT\Temp.. %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 deletes itself after execution.

Other System Modifications

This backdoor modifies the following registry key(s)/entry(ies) as part of its installation routine:

HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\
Services\Tcpip\Parameters
NameServer = 93.188.163.68,93.188.166.7

(Note: The default value data of the said registry entry is {User Defined}.)

HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\
Services\Tcpip\Parameters
DhcpNameServer = 93.188.163.68,93.188.166.7

(Note: The default value data of the said registry entry is {User Defined}.)

HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\
Services\Tcpip\Parameters\
Interfaces\{20A5AFB8-0B46-48F8-B005-BF2A8A82574A}
NameServer = 93.188.163.68,93.188.166.7

(Note: The default value data of the said registry entry is {User Defined}.)

HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\
Services\Tcpip\Parameters\
Interfaces\{20A5AFB8-0B46-48F8-B005-BF2A8A82574A}
DhcpNameServer = 93.188.163.68,93.188.166.7

(Note: The default value data of the said registry entry is {User Defined}.)

  SOLUTION

Minimum Scan Engine:

8.900

VSAPI OPR PATTERN File:

7.505.00

VSAPI OPR PATTERN Date:

30 Sep 2010

Note :

Trend customers:

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