WORM_BLADAB.D
Windows
Threat Type: Worm
Destructiveness: No
Encrypted: Yes
In the wild: Yes
OVERVIEW
This worm arrives on a system as a file dropped by other malware or as a file downloaded unknowingly by users when visiting malicious sites.
It executes commands from a remote malicious user, effectively compromising the affected system.
It logs a user's keystrokes to steal information.
TECHNICAL DETAILS
Arrival Details
This worm 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 worm drops the following copies of itself into the affected system and executes them:
- %User Temp%\GoogleChrome.exe
(Note: %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.)
It adds the following mutexes to ensure that only one of its copies runs at any one time:
- ed695f7a0a96a421871268638e7cecd4
Autostart Technique
This worm adds the following registry entries to enable its automatic execution at every system startup:
HKEY_CURRENT_USER\Software\Microsoft\
Windows\CurrentVersion\Run
ed695f7a0a96a421871268638e7cecd4 = "%User Temp%\GoogleChrome.exe" .."
It drops the following file(s) in the Windows User Startup folder to enable its automatic execution at every system startup:
- %User Startup%\ed695f7a0a96a421871268638e7cecd4
(Note: %User Startup% is the current user's Startup folder, which is usually C:\Windows\Profiles\{user name}\Start Menu\Programs\Startup on Windows 98 and ME, C:\WINNT\Profiles\{user name}\Start Menu\Programs\Startup on Windows NT, and C:\Documents and Settings\{User name}\Start Menu\Programs\Startup.)
Other System Modifications
This worm adds the following registry keys:
HKEY_CURRENT_USER\Software\ed695f7a0a96a421871268638e7cecd4
It adds the following registry entries:
HKEY_CURRENT_USER\Environment
SEEM_MASK_NOZONECHECKS = "1"
HKEY_CURRENT_USER\Software\ed695f7a0a96a421871268638e7cecd4
US = "@"
It creates the following registry entry(ies) to bypass Windows Firewall:
HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\
Services\SharedAccess\Parameters\
FirewallPolicy\StandardProfile\AuthorizedApplications\
List
%User Temp%\GoogleChrome.exe = "%User Temp%\GoogleChrome.exe:*:Enabled:GoogleChrome.exe"
Propagation
This worm drops the following copy of itself in all physical and removable drives:
- {Drive Letter}:\! My Picutre.SCR
Backdoor Routine
This worm executes the following commands from a remote malicious user:
- Download and execute files
- Compress files for uploading
- Load plugins
- Ping
- Registry management
- Remote shell execution
- Restart
- Screenshot
- Unistall itself
- Update itself
- Terminate itself
It connects to the following URL(s) to send and receive commands from a remote malicious user:
- {BLOCKED}23.{BLOCKED}p.org
Dropping Routine
This worm drops the following file(s), which it uses for its keylogging routine:
- %User Temp%\GoogleChrome.exe.tmp
(Note: %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.)
Information Theft
This worm logs a user's keystrokes to steal information.
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
Note that not all files, folders, and registry keys and entries are installed on your computer during this malware's/spyware's/grayware's execution. This may be due to incomplete installation or other operating system conditions. If you do not find the same files/folders/registry information, please proceed to the next step.
Step 3
Restart in Safe Mode
Step 4
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
- ed695f7a0a96a421871268638e7cecd4
- ed695f7a0a96a421871268638e7cecd4
Step 5
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\Environment
- SEEM_MASK_NOZONECHECKS = "1"
- SEEM_MASK_NOZONECHECKS = "1"
- In HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Run
- ed695f7a0a96a421871268638e7cecd4 = "%User Temp%\GoogleChrome.exe.exe" .."
- ed695f7a0a96a421871268638e7cecd4 = "%User Temp%\GoogleChrome.exe.exe" .."
- In HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\SharedAccess\Parameters\FirewallPolicy\StandardProfile\AuthorizedApplications\List
- %User Temp%\GoogleChrome.exe.exe = "%User Temp%\GoogleChrome.exe.exe:*:Enabled:GoogleChrome.exe.exe"
- %User Temp%\GoogleChrome.exe.exe = "%User Temp%\GoogleChrome.exe.exe:*:Enabled:GoogleChrome.exe.exe"
Step 6
Search and delete this file
- %User Temp%\GoogleChrome.exe.tmp
Step 7
Restart in normal mode and scan your computer with your Trend Micro product for files detected as WORM_BLADAB.D. 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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