BKDR_DERVEC.AH
Windows 2000, Windows XP, Windows Server 2003
![](/vinfo/imgFiles/legend.jpg)
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
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
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
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
- Security
- In HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Enum\Root
- LEGACY_REGSERV
- LEGACY_REGSERV
- In HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services
- AudioLog0n
- AudioLog0n
- In HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services
- CliSvc
- CliSvc
- In HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services
- NetSrv
- NetSrv
- In HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services
- RegServ
- RegServ
- In HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services
- SysSrv
- SysSrv
- In HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services
- TCPService
- TCPService
- In HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services
- WNetService
- WNetService
Step 3
Search and delete this folder
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.
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