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TROJ_GORIADU.SMW

October 08, 2012
 Analysis by: jasperm
 PLATFORM:

Windows 2000, Windows XP, Windows Server 2003

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

  • Threat Type: Trojan

  • Destructiveness: No

  • Encrypted: No

  • In the wild: Yes

  OVERVIEW


This Trojan may be dropped by TROJ_GORIADU.DRP.

This malicious .DLL file decrypts the encrypted file {Varies}.XML located in the %Program Files%\baidu folder, which is included in the malware package. The decrypted data is an executable data which will then be written to a file named setup.exe, detected as TROJ_GORIADU.DRP.

This Trojan may be dropped by other malware. It may be dropped by other malware.

  TECHNICAL DETAILS

File Size:

708,672 bytes

File Type:

PE

Memory Resident:

Yes

Initial Samples Received Date:

22 Jan 2011

Arrival Details

This Trojan may be dropped by other malware.

It may be dropped by the following malware:

  • TROJ_GORIADU.DRP

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\NetHomeIDE
ImagePath = %System%\svchost.exe -k mysysgroup3

HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\
Services\NetHomeIDE\Parameters
ServiceDll = %System%\{malware name}.dll

Other Details

This Trojan does the following:

  • This malicious .DLL file decrypts the encrypted file {Varies}.XML located in the %Program Files%\baidu folder, which is included in the malware package. The decrypted data is an executable data which will then be written to a file named setup.exe, detected as TROJ_GORIADU.DRP.

(Note: %Program Files% is the default Program Files folder, usually C:\Program Files.)

  SOLUTION

Minimum Scan Engine:

8.900

VSAPI PATTERN File:

7.792.16

VSAPI PATTERN Date:

25 Jan 2011

VSAPI PATTERN Date:

1/25/2011 12:00:00 AM

FIRST VSAPI PATTERN FILE:

7.792.09

FIRST VSAPI PATTERN DATE:

25 Jan 2011

VSAPI OPR PATTERN File:

7.793.00

VSAPI OPR PATTERN Date:

25 Jan 2011

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

Remove malware files dropped/downloaded by TROJ_GORIADU.SMW

    • TROJ_GORIADU.DRP

Step 3

Identify and delete files detected as TROJ_GORIADU.SMW using either the Startup Disk or Recovery Console

[ Learn More ]

Step 4

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
    • NetHomeIDE

Step 5

Scan your computer with your Trend Micro product to delete files detected as TROJ_GORIADU.SMW. 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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