Infection Channel: Propagates via removable drives
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.
It drops an AUTORUN.INF file to automatically execute the copies it drops when a user accesses the drives of an affected system.
File size: 135,168 bytes
File type: EXE
Memory resident: Yes
Initial samples received date: 14 Mar 2012
Payload: Compromises system security
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:
- %User Profile%\{random}.exe
(Note: %User Profile% is the current user's profile folder, which is usually C:\Documents and Settings\{user name} on Windows 2000, XP, and Server 2003, or C:\Users\{user name} 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
{random} = "%User Profile%\{random}.exe /{random letter}"
Other System Modifications
This worm adds the following registry entries as part of its installation routine:
HKEY_LOCAL_MACHINE\SOFTWARE\Policies\
Microsoft\Windows\WindowsUpdate\
AU
NoAutoUpdate = "1"
It modifies the following registry entries to hide files with Hidden attributes:
HKEY_CURRENT_USER\Software\Microsoft\
Windows\CurrentVersion\Explorer\
Advanced
ShowSuperHidden = "0"
(Note: The default value data of the said registry entry is 1.)
Propagation
This worm drops the following copy(ies) of itself in all removable drives:
- Passwords.exe
- Porn.exe
- {random}.exe
- Secret.exe
- Sexy.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:
{garbage chracters}
[autorun]
icoN={random}.exe,0
{garbage chracters}
open={random}.EXE
{garbage chracters}
actiON=8183
{garbage chracters}
USeAUtopLAY=1
{garbage chracters}
Backdoor Routine
This worm connects to the following URL(s) to send and receive commands from a remote malicious user:
- ns1.{BLOCKED}.com
- ns1.{BLOCKED}1532.com
- ns1.{BLOCKED}ll.org
- ns2.{BLOCKED}.com
NOTES:
The dropped autorun.inf is detected as Mal_OtorunS.
It searches for folders in all removable drives then drops copies of itself as {folder name}.exe.
It also uses the filenames of of files with the following extensions:
- .avi
- .bmp
- .doc
- .gif
- .jpe
- .jpg
- .mp3
- .mp4
- .mpg
- .pdf
- .png
- .tif
- .txt
- .wav
- .wma
- .wmv
- .xls
It then sets the attribute of the original file or folder to Hidden and System to trick users into thinking that the dropped copy is the legitimate file or folder.
It also adds the following non-malicious file in removable drives:
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