Worm.WSF.DUNIHI.PAT

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 drops copies of itself into all the removable drives connected to an affected system.

It executes commands from a remote malicious user, effectively compromising the affected system.

It logs a user's keystrokes to steal information.

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 copies of itself into the affected system and executes them:

• %Application Data%\{Malware Name}.wsf

(Note: %Application Data% is the current user's Application Data folder, which is usually C:\Documents and Settings\{user name}\Application Data on Windows 2000(32-bit), XP, and Server 2003(32-bit), or C:\Users\{user name}\AppData\Roaming on Windows Vista, 7, 8, 8.1, 2008(64-bit), 2012(64-bit) and 10(64-bit).)

It drops the following files:

• %User Temp%\ebgeaegdbdecaedfebace.reg

(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(32-bit), XP, and Server 2003(32-bit), or C:\Users\{user name}\AppData\Local\Temp on Windows Vista, 7, 8, 8.1, 2008(64-bit), 2012(64-bit) and 10(64-bit).)

It adds the following processes:

• regedit.exe %User Temp%\ebgeaegdbdecaedfebace.reg

(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(32-bit), XP, and Server 2003(32-bit), or C:\Users\{user name}\AppData\Local\Temp on Windows Vista, 7, 8, 8.1, 2008(64-bit), 2012(64-bit) and 10(64-bit).)

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
{Malware Name} = wscript.exe //B "%Application Data%\{Malware Name}.wsf"

HKEY_LOCAL_MACHINE\Software\Microsoft\
Windows\CurrentVersion\Run
{Malware Name} = wscript.exe //B "%Application Data%\{Malware Name}.wsf"

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

• %User Startup%\{Malware Name}.wsf

(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, C:\Documents and Settings\{User name}\Start Menu\Programs\Startup on Windows 2003(32-bit), XP and 2000(32-bit), or C:\Users\{user name}\AppData\Roaming\Microsoft\Windows\Start Menu\Programs\Startup on Windows Vista, 7, 8, 8.1, 2008(64-bit), 2012(64-bit), 10(64-bit).)

Other System Modifications

This Worm adds the following registry entries as part of its installation routine:

HKEY_LOCAL_MACHINE\SOFTWARE\{Malware Name}
(Default) = {true or false} - {Date of Infection}

It adds the following registry keys as part of its installation routine:

HKEY_LOCAL_MACHINE\SOFTWARE\{Malware Name}

It modifies the following registry entries:

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows\CurrentVersion\Policies\
System
EnableLUA = 0

(Note: The default value data of the said registry entry is 1.)

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows\CurrentVersion\Policies\
System
ConsentPromptBehaviorAdmin = 0

(Note: The default value data of the said registry entry is 3.)

HKEY_LOCAL_MACHINE\SOFTWARE\Policies\
Microsoft\Windows Defender
DisableAntiSpyware = 1

(Note: The default value data of the said registry entry is 0.)

Propagation

This Worm drops copies of itself into all the removable drives connected to an affected system.

It creates shortcut files (.LNK) disguised as folders or files located on the affected drives pointing to the malware copy.

Backdoor Routine

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

• disconnect - Terminate malware process
• reboot - Reboot the machine
• shutdown - Shutdown the machine
• execute - Execute command sent by C&C
• install-sdk - Install tool used for stealing passwords from web browsers
• get-pass - Steal passwords from a specific web browser
• get-pass-offline - Steal passwords from pre-determined web browsers
• update - Update the malware script
• uninstall - Uninstall the malware from the machine
• up-n-exec - Download and execute a file from a pre-determined URL
• bring-log - Upload WSH logs
• down-n-exec - Download and execute a file from the given URL
• filemanager - Download and execute fm-plugin.exe
• rdp - Download and execute rd-plugin.exe used for keylogging
• rev-proxy - Drop and execute rprox.exe used for reverse proxy
• exit-proxy - Terminate rprox.exe
• exit-hrdp - Terminate hrdp.exe
• keylogger - Drop and execute kl-plugin.exe used for keylogging
• offline-keylogger - Drop and execute kl-plugin.exe used for keylogging
• browse-logs - Upload list of logs
• cmd-shell - Execute sent shell command
• get-processes - Sends list of running processes
• disable-uac - Disable security
• check-eligible - Check if a file exists
• rev-rdp - Download and execute rdp
• force-eligible - Check if a file exists then execute it
• elevate - Elevate malware administrative rights
• if-elevate - Check if malware has administrative rights
• kill-process - Terminate a specific process
• sleep - The malware sleeps for a given amount of time
• update - Update the malware script

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

• danielmasonyachtsale.{BLOCKED}s.org

Information Theft

This Worm gathers the following data:

• Computer Name
• User Name
• Operating System
• AV Products
• Machine's Country
• Disk Volume Serial Number
• User Credentials

It logs a user's keystrokes to steal information.