WORM_NGRBOT.VFF
Worm:Win32/Dorkbot.I (Microsoft)
Windows 2000, Windows Server 2003, Windows XP (32-bit, 64-bit), Windows Vista (32-bit, 64-bit), Windows 7 (32-bit, 64-bit)
Threat Type: Worm
Destructiveness: No
Encrypted:
In the wild: Yes
OVERVIEW
This worm arrives via removable drives. It arrives on a system as a file dropped by other malware or as a file downloaded unknowingly by users when visiting malicious sites.
It deletes the initially executed copy of itself.
TECHNICAL DETAILS
236032 bytes
EXE
16 Oct 2015
Arrival Details
This worm arrives via removable drives.
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:
- %Application Data%\{random file name}
- %Application Data%\Update\Explorer.exe
(Note: %Application Data% is the Application Data folder, where it usually is C:\Documents and Settings\{user name}\Application Data on Windows 2000, Windows Server 2003, and Windows XP (32- and 64-bit); C:\Users\{user name}\AppData\Roaming 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_CURRENT_USER\Software\Microsoft\
Windows\CurrentVersion\Run
Windows Explorer Manager = "%Application Data%\Update\Explorer.exe"
Propagation
This worm drops the following copy(ies) of itself in all removable drives:
- {Removable Drive Letter}:\{random filename}.exe
It sets the attributes of the following items to Hidden to trick the user into clicking the .LNK files:
- {Removable Drive Letter}:\{Folder Name}
Other Details
This worm connects to the following possibly malicious URL:
- http://api.{BLOCKED}ia.com/
It deletes the initially executed copy of itself
NOTES:
It drops the following LNK files disguised as folders to trick the user into clicking them to execute the dropped copy of the worm:
- {Drive Letter}:\{Folder Name}.lnk