TROJ_CRILOCK.CI
Windows 2000, Windows XP, Windows Server 2003

Threat Type: Trojan
Destructiveness: No
Encrypted:
In the wild: Yes
OVERVIEW
This Trojan 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
309,958 bytes
EXE
04 Feb 2014
Arrival Details
This Trojan 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 Trojan drops the following files:
- {Folder Path}\README TO UNLOCK.txt
It drops the following copies of itself into the affected system:
- %User Temp%\Q92sPD97W8G9xnT.exe
- "%User Temp%\tEST.exe
(Note: %User Temp% is the current user's Temp folder, which is usually C:\Documents and Settings\{user name}\Local Settings\Temp on Windows 2000, XP, and Server 2003, or C:\Users\{user name}\AppData\Local\Temp on Windows Vista and 7.)
Autostart Technique
This Trojan adds the following registry entries to enable its automatic execution at every system startup:
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows\CurrentVersion\Run
Alcmeter = "%User Temp%\Q92sPD97W8G9xnT.exe"
Other System Modifications
This Trojan adds the following registry keys:
HKEY_CLASSES_ROOT\.LOCKED
HKEY_CLASSES_ROOT\OZOBUKHRXMOVNAR
HKEY_CLASSES_ROOT\OZOBUKHRXMOVNAR\DefaultIcon
HKEY_CLASSES_ROOT\OZOBUKHRXMOVNAR\shell\
open\command
HKEY_CURRENT_USER\Software\Adobe\
Adobe Acrobat\10.0
HKEY_CURRENT_USER\Software\Adobe\
Adobe Synchronizer\10.0
HKEY_LOCAL_MACHINE\System\Acrobatbrokerserverdispatchercpp789
HKEY_CURRENT_USER\Software\Adobe\
Acrobat Reader\10.0\Installer\
Migrated
NOTES:
This malware encrypts files and renames them to {filename and extension}.LOCKED.