WORM_DORKBOT.CD
Windows 2000, Windows XP, Windows Server 2003
Threat Type: Worm
Destructiveness: No
Encrypted: Yes
In the wild: Yes
OVERVIEW
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.
TECHNICAL DETAILS
253,952 bytes
EXE
Yes
27 Oct 2011
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.