TROJ_SERVSTAR.DY
Virtool:Win32/CeeInject.BN (Microsoft)
Windows 2000, Windows XP, Windows Server 2003
![](/vinfo/imgFiles/legend.jpg)
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.
It deletes the initially executed copy of itself.
TECHNICAL DETAILS
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 copies of itself into the affected system:
- %Program Files%\7rar\{random numbers}.jpg
- %Program Files%\7rar\WinHodx32.exe
(Note: %Program Files% is the default Program Files folder, usually C:\Program Files.)
It creates the following folders:
- %Program Files%\7rar
(Note: %Program Files% is the default Program Files folder, usually C:\Program Files.)
It adds the following mutexes to ensure that only one of its copies runs at any one time:
- {abc-_-cba}
Autostart Technique
This Trojan registers itself as a system service to ensure its automatic execution at every system startup by adding the following registry entries:
HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\
Services\WinHtwg33
ImagePath = "%Program Files%\7rar\WinHodx32.exe"
Other Details
This Trojan deletes the initially executed copy of itself
NOTES:
It connects to the following site to report its installation:
- {BLOCKED}xiaozu.3322.org
It checks if the following process is running:
- ksafe.exe
If the said process is found, it removes the device associated with the following CLSID:
- {4d36e972-e325-11ce-bfc1-08002be10318}
The said CLSID is related to the network adapter device. Removing a device will delete the device's hardware and software registry keys and any hardware-profile-specific registry keys. This routine will prevent the user from accessing the internet.
SOLUTION
Step 1
For Windows XP and Windows Server 2003 users, before doing any scans, please make sure you disable System Restore to allow full scanning of your computer.
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_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services
- WinHtwg33
- WinHtwg33
Step 4
Search and delete this folder
- %Program Files%\7rar
Step 5
Restart in normal mode and scan your computer with your Trend Micro product for files detected as TROJ_SERVSTAR.DY. 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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