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TROJ_SERVSTART.A

October 08, 2012
 PLATFORM:

Windows 2000, XP, Server 2003

 OVERALL RISK RATING:
 DAMAGE POTENTIAL:
 DISTRIBUTION POTENTIAL:
 REPORTED INFECTION:

  • 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

File Size:

184,320 bytes

File Type:

PE

Memory Resident:

Yes

Initial Samples Received Date:

10 Dec 2009

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

Minimum Scan Engine:

8.900

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

[ Learn More ]

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


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