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VBS_DUNIHI.MEM

February 23, 2015
 Analysis by: Miguel Carlo Ang
 ALIASES:

Worm.VBS.Dunihi.BC(Bitdefender);Worm:VBS/Jenxcus.K(Microsoft)

 PLATFORM:

Windows

 OVERALL RISK RATING:
 DAMAGE POTENTIAL:
 DISTRIBUTION POTENTIAL:
 REPORTED INFECTION:
 INFORMATION EXPOSURE:

  • Threat Type: Worm

  • Destructiveness: No

  • Encrypted:

  • 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.

  TECHNICAL DETAILS

File Size:

100,670 bytes

Memory Resident:

Yes

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:

  • %User Temp%\EvilEyes.vbs

(Note: %User Temp% is the user's temporary folder, where it usually is C:\Documents and Settings\{user name}\Local Settings\Temp on Windows 2000, Windows Server 2003, and Windows XP (32- and 64-bit); C:\Users\{user name}\AppData\Local\Temp 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.)

Autostart Technique

This worm adds the following registry entries to enable its automatic execution at every system startup:

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows\CurrentVersion\Run
EvilEyes.vbs = %User Temp%\EvilEyes.vbs

HKEY_CURRENT_USER\Software\Microsoft\
Windows\CurrentVersion\Run
EvilEyes.vbs = %User Temp%\EvilEyes.vbs

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

  • %User Startup%\EvilEyes.vbs

(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 entries as part of its installation routine:

HKEY_CURRENT_USER
njq8 = "{n / y}"

Propagation

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

  • {removable drive letter}:\EvilEyes.vbs

Other Details

This worm connects to the following possibly malicious URL:

  • {BLOCKED}worm.zapto.org:5557

NOTES:

It drops shortcut files pointing to the copy of itself in removable drives. These dropped .LNK files use the names of the folders and files located on the said drives for their file names. It then sets the attributes of the original files to Hidden to trick the user into clicking the .LNK files.