BKDR_BEDEP.KA

 Analysis by: Rhena Inocencio

 ALIASES:

Backdoor.Win32.Bedep.knl (Kaspersky), a variant of Win32/Kryptik.EVEK 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 may be unknowingly downloaded by a user while visiting malicious websites.

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

  TECHNICAL DETAILS

File Size:

409,600 bytes

File Type:

DLL

Memory Resident:

Yes

Initial Samples Received Date:

28 Apr 2016

Arrival Details

This backdoor may be unknowingly downloaded by a user while visiting malicious websites.

Installation

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

  • %ProgramData%\{D9E629DC-CB1C-4A97-9900-81922B4EFFD4}\{malware filename}.dll

(Note: %ProgramData% is the Program Data folder, where it usually is C:\Program Files in Windows 2000, Windows Server 2003, and Windows XP (32- and 64-bit); C:\ProgramData in Windows Vista (32- and 64-bit), Windows 7 (32- and 64-bit), Windows 8 (32- and 64-bit), Windows 8.1 (32- and 64-bit), Windows Server 2008, and Windows Server 2012.)

Other System Modifications

This backdoor adds the following registry entries as part of its installation routine:

HKEY_CURRENT_USER\{SID}\SOFTWARE\
Classes\CLSID\{56CBD3CF-BF99-4DF5-851F-F5B9B57496A1}
InProcServer32 = "%ProgramData%\{D9E629DC-CB1C-4A97-9900-81922B4EFFD4}\{malware filename}.dll"

Other Details

This backdoor connects to the following possibly malicious URL:

  • http://{random generated domain}.com

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

  SOLUTION

Minimum Scan Engine:

9.800

FIRST VSAPI PATTERN FILE:

12.494.05

FIRST VSAPI PATTERN DATE:

28 Apr 2016

VSAPI OPR PATTERN File:

12.495.00

VSAPI OPR PATTERN Date:

29 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_BEDEP.KA

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\{SID}\SOFTWARE\Classes\CLSID\{56CBD3CF-BF99-4DF5-851F-F5B9B57496A1}
    • InProcServer32 = "%ProgramData%\{D9E629DC-CB1C-4A97-9900-81922B4EFFD4}\{malware filename}.dll"

Step 6

Search and delete this file

[ 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.  
  • %ProgramData%\{D9E629DC-CB1C-4A97-9900-81922B4EFFD4}\{malware filename}.dll

Step 7

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