➔
search
✕

WORM_DORKBOT.MCK

September 07, 2013
 Analysis by: Jaime Benigno Reyes
 ALIASES:

PWS:Win32/OnLineGames.JB (Microsoft), Trojan-Downloader.Win32.Genome.bbmu (Kaspersky), RDN/PWS-Mmorpg!n (McAfee)

 PLATFORM:

Windows 2000, Windows Server 2003, Windows XP (32-bit, 64-bit), Windows Vista (32-bit, 64-bit), Windows 7 (32-bit, 64-bit)

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

  • Threat Type: Worm

  • Destructiveness: No

  • Encrypted:

  • In the wild: Yes

  OVERVIEW


This worm arrives by connecting affected removable drives to a system. It 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:

73,728 bytes

File Type:

EXE

Memory Resident:

Yes

Initial Samples Received Date:

16 May 2013

Arrival Details

This worm arrives by connecting affected removable drives to a system.

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:

  • %System Root%\Users\Public\HEX-5823-6893-6818\jutched.exe (Windows Vista and higher versions)
  • %Application Data%\HEX-5823-6893-6818\jutched.exe (Versions lower than Windows Vista)

(Note: %System Root% is the root folder, which is usually C:\. It is also where the operating system is located.. %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 and 7.)

It creates the following folders:

  • %System Root%\Users\Public\HEX-5823-6893-6818 (Windows Vista and higher versions)
  • %Application Data%\HEX-5823-6893-6818 (Versions lower than Windows Vista)

(Note: %System Root% is the root folder, which is usually C:\. It is also where the operating system is located.. %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 and 7.)

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
Java Update Manager = "%System Root%\Users\Public\HEX-5823-6893-6818\jutched.exe" (Windows Vista and higher versions)

HKEY_CURRENT_USER\Software\Microsoft\
Windows\CurrentVersion\Run
Java Update Manager = "%Application Data%\HEX-5823-6893-6818\jutched.exe" (Versions lower than Windows Vista)

Propagation

This worm creates the following folders in all removable drives:

  • {removable drive letter}:\8585485

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

  • {removable drive letter}:\8585485\{folder name in the removable drive}.exe

Other Details

This worm connects to the following possibly malicious URL:

  • {BLOCKED}ution.{BLOCKED}e.net

NOTES:

The number of copies this worm drops in a removable drive inside the created folder 8585485 is equivalent to the number of folders present in that removable drive.

It use the folder names as its file names.

It drops shortcut files pointing to the copies of itself in removable drives.

For the file names of the dropped .LNK files, it uses the names of the folders located on the said drives and appends the letter 's'.

It then sets the attributes of the original folders to Hidden to trick the user into clicking the .LNK files.