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BKDR_PLUGX.DUKOV

April 15, 2016
 Analysis by: Rhena Inocencio
 ALIASES:

a variant of Win32/Korplug.IA trojan (ESET)

 PLATFORM:

Windows

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

  • Threat Type: Backdoor

  • Destructiveness: No

  • Encrypted:

  • In the wild: Yes

  OVERVIEW

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

  TECHNICAL DETAILS

File Size:

6,656 bytes

File Type:

DLL

Memory Resident:

Yes

Initial Samples Received Date:

14 Apr 2016

Arrival Details

This backdoor 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 requires the following additional components to properly run:

  • The content of the following registry entry:
    • HKEY_CURRENT_USER\Software\Binary
      RasTls.dll.msc = "{value}"
  • {malware path}\RasTls.DLL.msc

It does the following:

  • It reads the content of the following registry entry:
    • HKEY_CURRENT_USER\Software\Binary
      RasTls.dll.msc = "{value}"
  • It opens the following file:
    • {malware path}\RasTls.DLL.msc

  SOLUTION

Minimum Scan Engine:

9.800

FIRST VSAPI PATTERN FILE:

12.466.02

FIRST VSAPI PATTERN DATE:

14 Apr 2016

VSAPI OPR PATTERN File:

12.467.00

VSAPI OPR PATTERN Date:

15 Apr 2016

Step 1

Before doing any scans, Windows XP, Windows Vista, and Windows 7 users must disable System Restore to allow full scanning of their computers.

Step 2

Note that not all files, folders, and registry keys and entries are installed on your computer during this malware's/spyware's/grayware's execution. This may be due to incomplete installation or other operating system conditions. If you do not find the same files/folders/registry information, please proceed to the next step.

Step 3

Scan your computer with your Trend Micro product and note files detected as BKDR_PLUGX.DUKOV

Step 4

Restart in Safe Mode

[ Learn More ]

Step 5

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\Binary
    • RasTls.dll.msc = "{value}"

Step 6

Search and delete the file detected as BKDR_PLUGX.DUKOV

[ Learn More ]
Please make sure you check the Search Hidden Files and Folders checkbox in the More advanced options option to include all hidden files in the search result.

Step 7

Search and delete these files

[ Learn More ]
There may be some files that are 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.
  • {malware path}\RasTls.DLL.msc

Step 8

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