VBS_DUNIHI.THHAFAH

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.

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 files:

• {Removable Drive Letter}:\nWPZJHPFOa.vbs
• {Removable Drive Letter}:\{Malware Filename}.lnk
• {Removable Drive Letter}:\nWPZJHPFOa.lnk
• %Application Data%\nWPZJHPFOa.vbs
• %User Startup%\nWPZJHPFOa.vbs

(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, XP, and Server 2003, or C:\Users\{user name}\AppData\Roaming on Windows Vista, 7, and 8.. %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 XP, or C:\Users\{user name}\AppData\Roaming\Microsoft\Windows\Start Menu\Programs\Startup on Windows Vista, 7, and 8.)

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

• %User Temp%\{Malware Filename}.vbs
• %User Startup%\{Malware Filename}.vbs

(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, 7, and 8.. %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 XP, or C:\Users\{user name}\AppData\Roaming\Microsoft\Windows\Start Menu\Programs\Startup on Windows Vista, 7, and 8.)

It adds the following processes:

• wscript.exe //B "C:\Users\{BLOCKED}er_732\AppData\Roaming\nWPZJHPFOa.vbs"
• wscript.exe //B "C:\Users\{BLOCKED}~1\AppData\Local\Temp\{Malware Filename}.vbs"

Autostart Technique

This Worm creates the following registry entries to enable automatic execution of dropped component at every system startup:

HKEY_CURRENT_USER\Software\Microsoft\
Windows\CurrentVersion\Run
nWPZJHPFOa = "wscript.exe //B "C:\Users\{BLOCKED}er_732\AppData\Roaming\nWPZJHPFOa.vbs"

HKEY_CURRENT_USER\Software\Microsoft\
Windows\CurrentVersion\Run
{Malware Filename} = "wscript.exe //B "C:\Users\{BLOCKED}~1\AppData\Local\Temp\{Malware Filename}.vbs"

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows\CurrentVersion\Run
{Malware Filename} = "wscript.exe //B "C:\Users\{BLOCKED}~1\AppData\Local\Temp\{Malware Filename}.vbs"

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows\CurrentVersion\Run
nWPZJHPFOa = "wscript.exe //B "C:\Users\{BLOCKED}er_732\AppData\Roaming\nWPZJHPFOa.vbs"

Other System Modifications

This Worm adds the following registry entries:

HKEY_LOCAL_MACHINE\SOFTWARE\{Malware Filename}
{Default} = "false - 8/30/2018"

HKEY_LOCAL_MACHINE\SOFTWARE\NWPZJHPFOA
{Default} = "false - 8/30/2018"

Propagation

This Worm drops the following copies of itself in all physical and removable drives:

• {Removable Drive Letter}:\{Malware Filename}.vbs

Other Details

This Worm connects to the following possibly malicious URL:

• http://odogwu.{BLOCKED}s.net:49986/is-ready
• http://fud.{BLOCKED}pt.com:7744/is-ready