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BKDR_PLUGX.VSF

October 09, 2012
 ALIASES:

Backdoor.Korplug (Symantec), Win32/Korplug.E trojan (NOD32), Trojan-Spy.Win32.KeyLogger (Sunbelt), Trojan-Spy.Win32.KeyLogger (Ikarus)

 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 be dropped by other malware.

It creates folders where it drops its files.

  TECHNICAL DETAILS

File Size:

40960 bytes

File Type:

DLL

Memory Resident:

Yes

Initial Samples Received Date:

13 Sep 2012

Arrival Details

This backdoor may be dropped by other malware.

Installation

This backdoor drops the following file(s)/component(s):

  • {All Users' Profile}\Nateon\Nv.exe
  • {All Users' Profile}\Nateon\Nv.mp3
  • {All Users' Profile}\Nateon\NvSmart.hlp
  • {All Users' Profile}\SxS\bug.log

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

  • {All Users' Profile}\Nateon\NvSmartMax.dll

It creates the following folders:

  • {All Users' Profile}\Nateon
  • {All Users' Profile}\SxS

Other System Modifications

This backdoor adds the following registry entries:

HKEY_CLASSES_ROOT\FAST
CLSID = "{random hex values}"

HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
FAST
CLSID = "{random hex values}"

Other Details

This backdoor connects to the following possibly malicious URL:

  • http://{BLOCKED}.{BLOCKED}.198.24

  SOLUTION

Minimum Scan Engine:

9.200

FIRST VSAPI PATTERN FILE:

9.426.04

FIRST VSAPI PATTERN DATE:

27 Sep 2012

VSAPI OPR PATTERN File:

9.427.00

VSAPI OPR PATTERN Date:

28 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

Restart in Safe Mode

[ Learn More ]

Step 3

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_CLASSES_ROOT\FAST
    • CLSID = "{random hex values}"
  • In HKEY_LOCAL_MACHINE\Classes\FAST
    • CLSID = "{random hex values}"

Step 4

Search and delete these folders

[ Learn More ]
Please make sure you check the Search Hidden Files and Folders checkbox in the More advanced options option to include all hidden folders in the search result.
  • {All User's Profile}\Nateon
  • {All User's Profile}\SxS

Step 5

Restart in normal mode and scan your computer with your Trend Micro product for files detected as BKDR_PLUGX.VSF. 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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