BKDR_KYKYSHKA.C

October 08, 2012
 Analysis by: Kathleen Notario
 PLATFORM:

Windows 2000, Windows XP, Windows Server 2003

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

  • Threat Type: Backdoor

  • Destructiveness: No

  • Encrypted: No

  • In the wild: Yes

  OVERVIEW

However, as of this writing, the said sites are inaccessible. It deletes itself after execution.

  TECHNICAL DETAILS

File Size:

35,328 bytes

File Type:

PE

Memory Resident:

Yes

Initial Samples Received Date:

24 Feb 2011

Installation

This backdoor drops the following files:

  • %Program Files%\Common Files\System\admin.obj - also detected as BKDR_KYKYSHKA.C
  • C:\Program Files\Common Files\System\htrn_jis.dll - non-malicious file

(Note: %Program Files% is the default Program Files folder, usually C:\Program Files.)

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

  • %Program Files%\Common Files\System\QQMUDb.exe

(Note: %Program Files% is the default Program Files folder, usually C:\Program Files.)

Autostart Technique

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

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows\CurrentVersion\Run
QQvb = %Program Files%\Common Files\System\QQMUDb.exe

Other Details

This backdoor connects to the following possibly malicious URL:

  • http://{BLOCKED}ao123.cn/amc.bmp
  • http://{BLOCKED}9.com/sms/sms.jpg
  • http://{BLOCKED}1.com/count/count.asp

It does the following:

  • Drops the following file in several locations in the affected system:
    • lpk.dll - also detected as BKDR_KYKYSHKA.C

However, as of this writing, the said sites are inaccessible.

It deletes itself after execution.

  SOLUTION

Minimum Scan Engine:

8.900

VSAPI PATTERN File:

7.856.10

VSAPI PATTERN Date:

24 Feb 2011

VSAPI PATTERN Date:

2/24/2011 12:00:00 AM

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

Identify and terminate files detected as BKDR_KYKYSHKA.C

[ Learn More ]
  1. If the detected file is displayed in either Windows Task Manager or Process Explorer but you cannot delete it, restart your computer in safe mode. To do this, refer to this link for the complete steps.
  2. If the detected file is not displayed in either Windows Task Manager or Process Explorer, continue doing the next steps.

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_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Run
    • QQvb = %Program Files%\Common Files\System\QQMUDb.exe

Step 4

Search and delete this file

[ Learn More ]
There may be some component 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. C:\Program Files\Common Files\System\htrn_jis.dll

Step 5

Scan your computer with your Trend Micro product to delete files detected as BKDR_KYKYSHKA.C. 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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