BKDR_SMALL.NDE

October 09, 2012
 Analysis by: Anthony Joe Melgarejo
 ALIASES:

Win32/Agent.PEM trojan (NOD32), TrojanSpy.Agent.ccnr (VBA32), Gen:Variant.Barys.372 (Bitdefender)

 PLATFORM:

Windows 2000, Windows XP, Windows Server 2003

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

  • Threat Type: Backdoor

  • Destructiveness: No

  • Encrypted: Yes

  • In the wild: Yes

  OVERVIEW

This backdoor may arrive bundled with malware packages as a malware component. It arrives on a system as a file dropped by other malware or as a file downloaded unknowingly by users when visiting malicious sites.

It exports functions used by other malware. It requires its main component to successfully perform its intended routine.

  TECHNICAL DETAILS

File Size:

15360 bytes

File Type:

DLL

Initial Samples Received Date:

28 Sep 2012

Arrival Details

This backdoor may arrive bundled with malware packages as a malware component.

It arrives on a system as a file dropped by other malware or as a file downloaded unknowingly by users when visiting malicious sites.

Other Details

This backdoor exports functions used by other malware.

It connects to the following possibly malicious URL:

  • http://{BLOCKED}a.{BLOCKED}t.com

It requires its main component to successfully perform its intended routine.

NOTES:
It may connect to a remote machine to perform its malicious routine.

  SOLUTION

Minimum Scan Engine:

9.200

FIRST VSAPI PATTERN FILE:

9.430.02

FIRST VSAPI PATTERN DATE:

29 Sep 2012

VSAPI OPR PATTERN File:

9.431.00

VSAPI OPR PATTERN Date:

30 Sep 2012

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

Scan your computer with your Trend Micro product and note files detected as BKDR_SMALL.NDE

Step 3

Search and delete the file detected as BKDR_SMALL.NDE

*Note: Some component files may be hidden. Please make sure you check the Search Hidden Files and Folders checkbox in the More advanced options option to include all hidden files and folders in the search result.

To manually delete a malware/grayware file from the affected system:

  1. Right-click Start then click Search....
  2. In the Named input box, type the name of the file that was detected earlier.
  3. In the Look In drop-down list, select My Computer then press Enter.
  4. Once located, select the file then press SHIFT+DELETE to delete it.

Step 4

Scan your computer with your Trend Micro product to delete files detected as BKDR_SMALL.NDE. 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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