TROJ_DLOADER.AAVC
Generic-FADY!BD8854CEE079 (McAfee); Trojan.Win32.Generic!SB.0 (Sunbelt)
Windows 2000, Windows XP, Windows Server 2003
Threat Type: Trojan
Destructiveness: No
Encrypted:
In the wild: Yes
OVERVIEW
This Trojan 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 Trojan 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 Trojan creates the following folders:
- %System%\kcdn
- %System%\kcdn\config
- %System%\kcdn\temp
- %System%\kcdn\download
(Note: %System% is the Windows system folder, which is usually C:\Windows\System on Windows 98 and ME, C:\WINNT\System32 on Windows NT and 2000, or C:\Windows\System32 on Windows XP and Server 2003.)
Other System Modifications
This Trojan adds the following registry keys:
HKEY_CURRENT_USER\Software\Kamuse Inc.
hkey_current_user\software\kamuse inc.\
{malware file name}
hkey_current_user\software\kamuse inc.\
{malware file name}\patch
HKEY_CURRENT_USER\Software\Kamuse Inc.\
KUICDN
HKEY_CURRENT_USER\Software\Kamuse Inc.\
KUICDN\Settings
HKEY_CLASSES_ROOT\ksnd
HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
ksnd\DefaultIcon
HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
ksnd\shell
HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
ksnd\shell\open
HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
ksnd\shell\open\
command
It adds the following registry entries:
hkey_current_user\software\kamuse inc.\
{malware file name}\patch
ver = "1.2.8"
HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\
Services\SharedAccess\Parameters\
FirewallPolicy\StandardProfile\AuthorizedApplications\
List
%System%\kcdn\kcdn_mw.exe = "%System%\kcdn\kcdn_mw.exe:*:Enabled:kcdn_mw"
HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\
Services\SharedAccess\Parameters\
FirewallPolicy\StandardProfile
DoNotAllowExceptions = "0"
HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\
Services\SharedAccess\Parameters\
FirewallPolicy\DomainProfile
DoNotAllowExceptions = "0"
Dropping Routine
This Trojan drops the following files:
- %System%\kcdn\patch.tmp
- %System%\kcdn\kcdn_mw.exe
- %System%\kcdn\KSenderComponent.dll
- %System%\kcdn\LogComponent.dll
- %System%\kcdn\Microsoft.VC80.CRT.manifest
- %System%\kcdn\msvcm80.dll
- %System%\kcdn\msvcr80.dll
- %System%\kcdn\NetworkComponent.dll
- %System%\kcdn\SharedResourceComponent.dll
- %System%\kcdn\config/ksender.bin
- %System%\kcdn\config/ksender.ini
- %System%\kcdn\config/sfd_idx.kmf
- %System%\kcdn\config/sfn_idx.kmf
- %System%\kcdn\config/sft.kmf
- %System%\kcdn\config/sfu_idx.kmf
- %System%\kcdn\config/sfut.kmf
- %System%\kcdn\config/system.log
- %System%\kcdn\BackboneApp.dll
- %System%\kcdn\ConfigComponent.dll
- %System%\kcdn\CPComponent.dll
- %System%\kcdn\CryptoComponent.dll
- %System%\kcdn\ErrorRecoveryComponent.dll
- %System%\kcdn\config\system.log
- %System%\kcdn\config\ksender.ini
- %System%\kcdn\config\ksender.bin
- %System%\kcdn\config\sfd_idx.kmf.bak
- %System%\kcdn\config\sfn_idx.kmf.bak
- %System%\kcdn\config\sfu_idx.kmf.bak
- %System%\kcdn\config\sft.kmf.bak
- %System%\kcdn\config\sfut.kmf.bak
(Note: %System% is the Windows system folder, which is usually C:\Windows\System on Windows 98 and ME, C:\WINNT\System32 on Windows NT and 2000, or C:\Windows\System32 on Windows XP and Server 2003.)
Other Details
This Trojan connects to the following possibly malicious URL:
- http://{BLOCKED}.233.53/mw/update_mw.xml?ver=%30%2E%30
This report is generated via an automated analysis system.
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_CURRENT_USER\Software
- Kamuse Inc.
- In hkey_current_user\software\kamuse inc.
- {malware file name}
- In hkey_current_user\software\kamuse inc.\{malware file name}
- patch
- In HKEY_CURRENT_USER\Software\Kamuse Inc.
- KUICDN
- In HKEY_CURRENT_USER\Software\Kamuse Inc.\KUICDN
- Settings
- In HKEY_CLASSES_ROOT
- ksnd
- In HKEY_LOCAL_MACHINE\SOFTWARE\Classes\ksnd
- DefaultIcon
- In HKEY_LOCAL_MACHINE\SOFTWARE\Classes\ksnd
- shell
- In HKEY_LOCAL_MACHINE\SOFTWARE\Classes\ksnd\shell
- open
- In HKEY_LOCAL_MACHINE\SOFTWARE\Classes\ksnd\shell\open
- command
Step 3
Delete this registry value
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\kamuse inc.\{malware file name}\patch
- ver = "1.2.8"
- In HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\Services\SharedAccess\Parameters\FirewallPolicy\StandardProfile\AuthorizedApplications\List
- %System%\kcdn\kcdn_mw.exe = "%System%\kcdn\kcdn_mw.exe:*:Enabled:kcdn_mw"
- In HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\Services\SharedAccess\Parameters\FirewallPolicy\StandardProfile
- DoNotAllowExceptions = "0"
- In HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\Services\SharedAccess\Parameters\FirewallPolicy\DomainProfile
- DoNotAllowExceptions = "0"
Step 4
Search and delete these files
- %System%\kcdn\patch.tmp
- %System%\kcdn\kcdn_mw.exe
- %System%\kcdn\KSenderComponent.dll
- %System%\kcdn\LogComponent.dll
- %System%\kcdn\Microsoft.VC80.CRT.manifest
- %System%\kcdn\msvcm80.dll
- %System%\kcdn\msvcr80.dll
- %System%\kcdn\NetworkComponent.dll
- %System%\kcdn\SharedResourceComponent.dll
- %System%\kcdn\config/ksender.bin
- %System%\kcdn\config/ksender.ini
- %System%\kcdn\config/sfd_idx.kmf
- %System%\kcdn\config/sfn_idx.kmf
- %System%\kcdn\config/sft.kmf
- %System%\kcdn\config/sfu_idx.kmf
- %System%\kcdn\config/sfut.kmf
- %System%\kcdn\config/system.log
- %System%\kcdn\BackboneApp.dll
- %System%\kcdn\ConfigComponent.dll
- %System%\kcdn\CPComponent.dll
- %System%\kcdn\CryptoComponent.dll
- %System%\kcdn\ErrorRecoveryComponent.dll
- %System%\kcdn\config\system.log
- %System%\kcdn\config\ksender.ini
- %System%\kcdn\config\ksender.bin
- %System%\kcdn\config\sfd_idx.kmf.bak
- %System%\kcdn\config\sfn_idx.kmf.bak
- %System%\kcdn\config\sfu_idx.kmf.bak
- %System%\kcdn\config\sft.kmf.bak
- %System%\kcdn\config\sfut.kmf.bak
Step 5
Search and delete these folders
- %System%\kcdn
- %System%\kcdn\config
- %System%\kcdn\temp
- %System%\kcdn\download
Step 6
Scan your computer with your Trend Micro product to delete files detected as TROJ_DLOADER.AAVC. 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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