TROJ_BLAKSHADE.A
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:
- %User Profile%\Application Data\zzuX40eizZ
(Note: %User Profile% is the current user's profile folder, which is usually C:\Documents and Settings\{user name} on Windows 2000, XP, and Server 2003, or C:\Users\{user name} on Windows Vista and 7.)
Other System Modifications
This Trojan adds the following registry keys:
HKEY_CURRENT_USER\Software\VB and VBA Program Settings\
SrvID\ID
HKEY_CURRENT_USER\Software\VB and VBA Program Settings\
INSTALL\DATE
HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\
Control\MediaResources\msvideo
It adds the following registry entries:
HKEY_CURRENT_USER\Software\Microsoft\
Windows NT\CurrentVersion\Winlogon
shell = "%User Profile%\zzuX40eizZ\zzJvslHD4.exe,explorer.exe"
HKEY_CURRENT_USER\Software\VB and VBA Program Settings\
SrvID\ID
S3OBVZNC6B = "Straffern's Bot"
HKEY_CURRENT_USER\Software\VB and VBA Program Settings\
INSTALL\DATE
S3OBVZNC6B = "February 18, 2014"
HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\
Services\SharedAccess\Parameters\
FirewallPolicy\StandardProfile
DoNotAllowExceptions = "0"
HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\
Services\SharedAccess\Parameters\
FirewallPolicy\StandardProfile\AuthorizedApplications\
List
%System Root%\\{malware file name}.exe = "{random characters}"
HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\
Services\SharedAccess\Parameters\
FirewallPolicy\StandardProfile\AuthorizedApplications\
List
%User Profile%\Application Data\JLJY21VLBR.exe = "{random characters}"
Dropping Routine
This Trojan drops the following files:
- %User Profile%\zzuX40eizZ\qiecBl
- %User Profile%\zzuX40eizZ\zzJvslHD4.exe.lnk
- %User Temp%\IMG(65).jpg
(Note: %User Profile% is the current user's profile folder, which is usually C:\Documents and Settings\{user name} on Windows 2000, XP, and Server 2003, or C:\Users\{user name} on Windows Vista and 7.. %User Temp% is the current user's Temp folder, which is usually C:\Documents and Settings\{user name}\Local Settings\Temp on Windows 2000, XP, and Server 2003, or C:\Users\{user name}\AppData\Local\Temp on Windows Vista and 7.)
This report is generated via an automated analysis system.
SOLUTION
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
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\VB and VBA Program Settings\SrvID
- ID
- In HKEY_CURRENT_USER\Software\VB and VBA Program Settings\INSTALL
- DATE
- In HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\MediaResources
- msvideo
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\Microsoft\Windows NT\CurrentVersion\Winlogon
- shell = "%User Profile%\zzuX40eizZ\zzJvslHD4.exe,explorer.exe"
- In HKEY_CURRENT_USER\Software\VB and VBA Program Settings\SrvID\ID
- S3OBVZNC6B = "Straffern's Bot"
- In HKEY_CURRENT_USER\Software\VB and VBA Program Settings\INSTALL\DATE
- S3OBVZNC6B = "February 18, 2014"
- In HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\Services\SharedAccess\Parameters\FirewallPolicy\StandardProfile
- DoNotAllowExceptions = "0"
- In HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\Services\SharedAccess\Parameters\FirewallPolicy\StandardProfile\AuthorizedApplications\List
- %System Root%\{malware file name}.exe = "{random characters}"
- In HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\Services\SharedAccess\Parameters\FirewallPolicy\StandardProfile\AuthorizedApplications\List
- %User Profile%\Application Data\JLJY21VLBR.exe = "{random characters}"
Step 4
Search and delete these components
- %User Profile%\zzuX40eizZ\qiecBl
- %User Profile%\zzuX40eizZ\zzJvslHD4.exe.lnk
- %User Temp%\IMG(65).jpg
Step 5
Search and delete this folder
- %User Profile%\Application Data\zzuX40eizZ
Step 6
Scan your computer with your Trend Micro product to delete files detected as TROJ_BLAKSHADE.A. 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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