WORM_BLADABINDI.JBQ

This worm arrives via removable drives. It 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. However, as of this writing, the said sites are inaccessible.

It gathers information and reports it to its servers.

Arrival Details

This worm arrives via removable drives.

It 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 file(s)/component(s):

• %Application Data%\system.exe.ini <- configuration file

(Note: %Application Data% is the Application Data folder, where it usually is C:\Documents and Settings\{user name}\Application Data on Windows 2000, Windows Server 2003, and Windows XP (32- and 64-bit); C:\Users\{user name}\AppData\Roaming on Windows Vista (32- and 64-bit), Windows 7 (32- and 64-bit), Windows 8 (32- and 64-bit), Windows 8.1 (32- and 64-bit), Windows Server 2008, and Windows Server 2012.)

It drops the following copies of itself into the affected system:

• %Application Data%\system.exe

(Note: %Application Data% is the Application Data folder, where it usually is C:\Documents and Settings\{user name}\Application Data on Windows 2000, Windows Server 2003, and Windows XP (32- and 64-bit); C:\Users\{user name}\AppData\Roaming on Windows Vista (32- and 64-bit), Windows 7 (32- and 64-bit), Windows 8 (32- and 64-bit), Windows 8.1 (32- and 64-bit), Windows Server 2008, and Windows Server 2012.)

It adds the following mutexes to ensure that only one of its copies runs at any one time:

• appdatasystem.exe

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
system.exe = "%Application Data%\system.exe"

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows\CurrentVersion\Run
system.exe = "%Application Data%\system.exe"

It drops the following file(s) in the Windows User Startup folder to enable its automatic execution at every system startup:

• %User Startup%\system.exe <- copy of itself

(Note: %User Startup% is the current user's Startup folder, which is usually C:\Documents and Settings\{user}\Start Menu\Programs\Startup on Windows 2000 and XP, and C:\Documents and Settings\{User name}\Start Menu\Programs\Startup on Windows Vista, 7, and 8.)

Other System Modifications

This worm deletes the following files:

• {.vbs file in root directories}

Propagation

This worm drops the following copy(ies) of itself in all removable drives:

• {Removable Drive Letter}:\system.exe

Backdoor Routine

This worm executes the following commands from a remote malicious user:

• Download and execute files
• Execute arbitrary codes or shell commands
• Uninstall itself
• Update itself
• Terminate itself
• Gather credentials from the following and sends to its C&C server:
  • DUC Registry
  • Filezilla registry and XML files

It connects to the following URL(s) to send and receive commands from a remote malicious user:

• mda.{BLOCKED}p.org:88

However, as of this writing, the said sites are inaccessible.

Other Details

This worm does the following:

• Bypass firewall protection by executing the following shell commands:
  • "%System%\netsh.exe" firwall add allowedprogram "%Application Data%\system.exe" "system.exe" ENABLE

(Note: %Application Data% is the Application Data folder, where it usually is C:\Documents and Settings\{user name}\Application Data on Windows 2000, Windows Server 2003, and Windows XP (32- and 64-bit); C:\Users\{user name}\AppData\Roaming on Windows Vista (32- and 64-bit), Windows 7 (32- and 64-bit), Windows 8 (32- and 64-bit), Windows 8.1 (32- and 64-bit), Windows Server 2008, and Windows Server 2012.)

It gathers the following information and reports it to its servers:

• Computer Name
• User Name
• Country
• Volume Serial Number
• Operating System Version
• Active Window

NOTES:

This worm hides the dropped copy of the malware found in removable drive.

It creates .LNK (shortcut) files using existing files found in removable drives. It uses the original filenames and file extensions and appends .LNK after. It then hides the original files tricking users to click .LNK files. This .LNK files point out to a hidden dropped copy of itself in the removable drive.

It does not have rootkit capabilities.

It does not exploit any vulnerability.