TROJ_RANSOM.CZU
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: Trojan
Destructiveness: No
Encrypted: No
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
63,714 bytes
EXE
Yes
24 Oct 2012
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.
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
Microsoft Updater = "{malware path}\{malware name}.exe"
Other System Modifications
This Trojan deletes the following registry keys:
HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\
Control\SafeBoot\Minimal
HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\
Control\SafeBoot\Network
Other Details
This Trojan connects to the following possibly malicious URL:
- {BLOCKED}29.104
- {BLOCKED}secenter.org
SOLUTION
9.300
9.484.02
24 Oct 2012
Step 1
Before doing any scans, Windows XP, Windows Vista, and Windows 7 users must disable System Restore to allow full scanning of their computers.
Step 2
Identify and delete files detected as TROJ_RANSOM.CZU using the Recovery Console
Step 3
Delete this registry value
Important: Editing the Windows Registry incorrectly can lead to irreversible system malfunction. Please do this step only if you know how or you can ask assistance from your system administrator. Else, check this Microsoft article first before modifying your computer's registry.
- In HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Run
- Microsoft Updater = "{malware path}\{malware name}.exe"
- Microsoft Updater = "{malware path}\{malware name}.exe"
Step 4
Scan your computer with your Trend Micro product to delete files detected as TROJ_RANSOM.CZU. If the detected files have already been cleaned, deleted, or quarantined by your Trend Micro product, no further step is required. You may opt to simply delete the quarantined files. Please check this Knowledge Base page for more information.
NOTES:
Restore Safe Boot Registry Settings
To restore safe boot registry settings:
- Open a text editor like Notepad.
- Copy and paste the following script:
- On Windows 2000:
- On Windows Server 2003:
- On Windows XP:
- On Windows Vista:
- On Windows 7:
- On Windows 2000:
- Save this file as RESTORE.REG.
- Execute the file RESTORE.REG.
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