BKDR_DERVEC.AH

October 09, 2012
 Modified by: Sabrina Lei Sioting
 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 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:

207,874 bytes

File Type:

EXE

Memory Resident:

No

Initial Samples Received Date:

08 Jun 2012

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.

Installation

This backdoor drops the following files:

  • %System Root%\ProgramData\Microsoft\Windows\NetCC450.dll
  • %System Root%\ProgramData\Microsoft\Windows\QQlive.exe

(Note: %System Root% is the root folder, which is usually C:\. It is also where the operating system is located.)

It creates the following folders:

  • %System Root%\ProgramData
  • %System Root%\ProgramData\Microsoft
  • %System Root%\ProgramData\Microsoft\Windows
  • %System Root%\ProgramData\Microsoft\Windows\Common

(Note: %System Root% is the root folder, which is usually C:\. It is also where the operating system is located.)

Other System Modifications

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

HKEY_LOCAL_MACHINE\SOFTWARE\Security\
Log
u={email address entered}|p={password entered} = "CBMail"

It adds the following registry keys as part of its installation routine:

HKEY_LOCAL_MACHINE\SOFTWARE\Security

HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\
Enum\Root\LEGACY_REGSERV

HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\
Services\AudioLog0n

HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\
Services\CliSvc

HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\
Services\NetSrv

HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\
Services\RegServ

HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\
Services\SysSrv

HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\
Services\TCPService

HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\
Services\WNetService

Other Details

This backdoor connects to the following possibly malicious URL:

  • http://{BLOCKED}u.com/belheiwqiu/rss
  • http://{BLOCKED}u.com/bwhrpbe/rss
  • http://{BLOCKED}u.com/gpocoi55/rss
  • http://{BLOCKED}u.com/gqpgemc/rss
  • http://{BLOCKED}u.com/gqpgemcuwd/rss
  • http://{BLOCKED}u.com/heiwqiu/rss
  • http://{BLOCKED}u.com/ihnv2386/rss
  • http://{BLOCKED}u.com/iwaxsxg/rss
  • http://{BLOCKED}u.com/ocoijxnwkg/rss
  • http://{BLOCKED}u.com/wdxiw894/rss
  • http://{BLOCKED}u.com/wkgbbw73/rss

  SOLUTION

Minimum Scan Engine:

9.200

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

Delete this registry key

[ 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
    • Security
  • In HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Enum\Root
    • LEGACY_REGSERV
  • In HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services
    • AudioLog0n
  • In HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services
    • CliSvc
  • In HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services
    • NetSrv
  • In HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services
    • RegServ
  • In HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services
    • SysSrv
  • In HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services
    • TCPService
  • In HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services
    • WNetService

Step 3

Search and delete this folder

[ 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. %System Root%\ProgramData

Step 4

Scan your computer with your Trend Micro product to delete files detected as BKDR_DERVEC.AH. 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.


Did this description help? Tell us how we did.