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BKDR_NINDYA.A

October 26, 2010
 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

Trend Micro has flagged this backdoor application as noteworthy due to the increased potential for damage, propagation, or both, that it possesses. Specifically, it is a file downloaded by a malicious script file, which takes advantage of a 0-day exploit in Firefox.

To get a one-glance comprehensive view of the behavior of this Backdoor, refer to the Threat Diagram shown below.

This backdoor may be downloaded by other malware/grayware from remote sites.

It executes commands from a remote malicious user, effectively compromising the affected system.

  TECHNICAL DETAILS

Ports:

TCP Port 443

File Size:

48,640 bytes

File Type:

PE

Memory Resident:

Yes

Initial Samples Received Date:

26 Oct 2010

Arrival Details

This backdoor may be downloaded by the following malware/grayware from remote sites:

  • JS_NINDYA.A

Installation

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

  • %Temp%\symantec.exe

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

Autostart Technique

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

HKEY_CURRENT_USER\Software\Microsoft\
Windows\CurrentVersion\Run
Microsoft Windows Update = %Temp%\symantec.exe

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows\CurrentVersion\Run
Microsoft Windows Update = %Temp%\symantec.exe

Backdoor Routine

This backdoor opens the following port(s) where it listens for remote commands:

  • TCP port 443

It executes the following commands from a remote malicious user:

  • Date
  • ipconfig
  • net start
  • dir - to be done in all drives/folders
  • tasklist /v
  • Taskkill /im
  • net user
  • net view
  • del /s /q *.* - to be done in all drives/folders
  • shutdown
  • ver
  • exit

It connects to the following URL(s) to send and receive commands from a remote malicious user:

  • l-3com.{BLOCKED}s.tv (l-3com.{BLOCKED}s-work.com)

Other Details

Based on analysis of the codes, it has the following capabilities:

  • Sends back the results of the aforementioned commands back to the remote server.

It connects to the following URL(s) to check for an Internet connection:

  • nobel.usagov.mooo.com
  • www.update.microsoft.com

  SOLUTION

Minimum Scan Engine:

8.900

FIRST VSAPI PATTERN FILE:

7.572.04

FIRST VSAPI PATTERN DATE:

28 Oct 2010

VSAPI OPR PATTERN File:

7.573.00

VSAPI OPR PATTERN Date:

28 Oct 2010

Step 1

For Windows XP and Windows Server 2003 users, before doing any scans, please make sure you disable System Restore to allow full scanning of your computer.

Step 2

Remove malware files dropped/downloaded by BKDR_NINDYA.A

Step 3

Terminate a process file/s detected as BKDR_NINDYA.A

[ Learn More ]

*Note: If the detected file/s is/are not displayed in theWindows Task Manager, continue doing the next steps.

Step 4

Delete this registry value

[ Learn More ]

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
    • Microsoft Windows Update = %Temp%\symantec.exe
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Run
    • Microsoft Windows Update = %Temp%\symantec.exe

Step 5

Scan your computer with your Trend Micro product to delete files detected as BKDR_NINDYA.A. 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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