TROJ_SERVSTART.A
Windows 2000, XP, Server 2003
Threat Type: Trojan
Destructiveness: No
Encrypted:
In the wild: Yes
OVERVIEW
This Trojan connects to certain URLs. It may do this to remotely inform a malicious user of its installation. It may also do this to download possibly malicious files onto the computer, which puts the computer at a greater risk of infection by other threats.
It deletes itself after execution.
TECHNICAL DETAILS
Installation
This Trojan drops the following copies of itself into the affected system:
- %System%\hytvya.exe
(Note: %System% is the Windows system folder, which is usually C:\Windows\System on Windows 98 and ME, C:\WINNT\System32 on Windows NT and 2000, or C:\Windows\System32 on Windows XP and Server 2003.)
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\ControlSet001\
Services\sdfvc
Type = 10
HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\
Services\sdfvc
Start = 2
HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\
Services\sdfvc
ErrorControl = 0
HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\
Services\sdfvc
ImagePath = %System%\hytvya.exe
HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\
Services\sdfvc
DisplayName = Remote Command Service
Download Routine
This Trojan connects to the following malicious URLs:
- ab3b4.3322.org:1800
- monn2.3322.org
Other Details
This Trojan deletes itself after execution.
SOLUTION
Step 1
Scan your computer with your Trend Micro product and note files detected as TROJ_SERVSTART.A
Step 2
Restart in Safe Mode, and then 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
- sdfvc
- sdfvc
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