WORM_DORKBOT.CD

This worm arrives via removable drives. It may be dropped by other malware.

It drops an AUTORUN.INF file to automatically execute the copies it drops when a user accesses the drives of an affected system.

It also has rootkit capabilities, which enables it to hide its processes and files from the user.

Arrival Details

This worm arrives via removable drives.

It may be dropped by other malware.

It may be downloaded from the following remote sites:

• http://{BLOCKED}le.com/dl/133427805/4e64adb/b1.dat
• http://s217.{BLOCKED}le.com/get/16dd73798d0be89ecd2b93ded050c79e829e5af7/4eaa4d00/2/4e0c5cda66f98382/7f3f25d/b1.dat

Installation

This worm drops the following copies of itself into the affected system:

• %User Profile%\Application Data\{random characters}.exe

(Note: %User Profile% is the current user's profile folder, which is usually C:\Windows\Profiles\{user name} on Windows 98 and ME, C:\WINNT\Profiles\{user name} on Windows NT, and C:\Documents and Settings\{user name} on Windows 2000, XP, and Server 2003.)

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 file name} = "%User Profile%\Application Data\{malware file name}.exe"

Propagation

This worm creates the following folders in all removable drives:

• {drive letter}:\RECYCLER

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

• {drive letter}:\RECYCLER\{random characters}.exe

It drops an AUTORUN.INF file to automatically execute the copies it drops when a user accesses the drives of an affected system.

The said .INF file contains the following strings:

[autorun]
;{garbage}
shellexecute=RECYCLER\{random characters}.exe
;{garbage}
shell\open\command=RECYCLER\{random characters}.exe
;{garbage}
icon=shell32.dll,7
;{garbage}
action=Open folder to view files
;{garbage}
shell\explore\command=RECYCLER\{random characters}.exe
;{garbage}
useautoplay=1
;{garbage}

Rootkit Capabilities

This worm also has rootkit capabilities, which enables it to hide its processes and files from the user.

Download Routine

This worm downloads an updated copy of itself from the following website(s):

• http://{BLOCKED}e.com/dl/133427805/4e64adb/b1.dat
• http://{BLOCKED}7.hotfile.com/get/5734caeab7c19f1f61af2c2efbaa844650c3a74f/4eaa2a70/2/4e0c5cda66f98382/7f3f25d/b1.dat

Other Details

This worm connects to the following URL(s) to get the affected system's IP address:

• http://api.wipmania.com/

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