TSPY_CIMUZ.WCS
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: Spyware
Destructiveness: No
Encrypted: Yes
In the wild: Yes
OVERVIEW
This spyware arrives on a system as a file dropped by other malware or as a file downloaded unknowingly by users when visiting malicious sites.
It executes the dropped file(s). As a result, malicious routines of the dropped files are exhibited on the affected system.
TECHNICAL DETAILS
Arrival Details
This spyware 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 spyware drops and executes the following files:
- %System%\iebho.dll
(Note: %System% is the Windows system folder, which is usually C:\Windows\System32.)
Autostart Technique
This spyware registers itself as a BHO to ensure its automatic execution every time Internet Explorer is used by adding the following registry keys:
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows\CurrentVersion\Explorer\
Browser Helper Objects\{D032570A-5F63-4812-A094-87D007C23012}
HKEY_CURRENT_USER\Software\AppDataLow
It registers itself as a BHO to ensure its automatic execution every time Internet Explorer is used by adding the following registry entries:
HKEY_CURRENT_USER\Software\AppDataLow\
BHOinit
url = "http://{BLOCKED}nevinovat.com/pteradaptelfan/ "
HKEY_CURRENT_USER\Software\AppDataLow\
BHOinit
url2 = "http://{BLOCKED}fnevinovat.com/pteradaptelfan/ "
Other System Modifications
This spyware adds the following registry entries as part of its installation routine:
HKEY_CLASSES_ROOT\CLSID\{D032570A-5F63-4812-A094-87D007C23012}\
InprocServer32
@ = "%System%\iebho.dll"
HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
CLSID\{D032570A-5F63-4812-A094-87D007C23012}\InprocServer32
@ = "%System%\iebho.dll"
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Internet Explorer\Main
Enable Browser Extensions = "yes"
It adds the following registry keys as part of its installation routine:
HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
CLSID\{D032570A-5F63-4812-A094-87D007C23012}
HKEY_CLASSES_ROOT\CLSID\{D032570A-5F63-4812-A094-87D007C23012}
Dropping Routine
This spyware executes the dropped file(s). As a result, malicious routines of the dropped files are exhibited on the affected system.
Other Details
This spyware connects to the following possibly malicious URL:
- http://{BLOCKED}nevinovat.com/pteradaptelfan/
SOLUTION
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
Restart in Safe Mode
Step 3
Delete this registry key
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_CLASSES_ROOT\CLSID
- {5C255C8A-E604-49b4-9D64-90988571CECB}
- {5C255C8A-E604-49b4-9D64-90988571CECB}
- In HKEY_LOCAL_MACHINE\SOFTWARE\Classes\CLSID
- {D032570A-5F63-4812-A094-87D007C23012}
- {D032570A-5F63-4812-A094-87D007C23012}
- In HKEY_CURRENT_USER\Software
- AppDataLow
- AppDataLow
- In HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Explorer\Browser Helper Objects
- {D032570A-5F63-4812-A094-87D007C23012}
- {D032570A-5F63-4812-A094-87D007C23012}
Step 4
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\Internet Explorer\Main
- Enable Browser Extensions = "yes"
- Enable Browser Extensions = "yes"
Step 5
Search and delete this file
- %System%\iebho.dll
Step 6
Scan your computer with your Trend Micro product to delete files detected as TSPY_CIMUZ.WCS. 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.
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