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Threat Encyclopedia

TROJ_GORIADU.DRP

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: Yes

  • In the wild: Yes

OVERVIEW


This Trojan drops files detected by Trend Micro as:

  • TROJ_GORIADU.SMX
  • TROJ_GORIADU.SMW
  • TROJ_GORIADU.SMC
  • TROJ_GORIADU.SMY
  • TROJ_GORIADU.SMM

It creates folders. It creates registry key.

This Trojan may be dropped by other malware.

TECHNICAL DETAILS

File Size:

Varies

File Type:

PE

Memory Resident:

No

Initial Samples Received Date:

24 Jan 2011

Payload:

Drops files

Arrival Details

This Trojan may be dropped by the following malware:

  • TROJ_GORIADU.SMX

Installation

This Trojan drops the following files:

  • %Program Files%\baidu\newnetgar.dll - detected as TROJ_GORIADU.SMW
  • %Program Files%\baidu\spass.dll - detected as TROJ_GORIADU.SMC
  • %Program Files%\baidu\passthru.dll - detected as TROJ_GORIADU.SMY
  • %Program Files%\baidu\netsf.inf - NDIS miniport driver configuration file
  • %Program Files%\baidu\netsf_m.inf - NDIS miniport driver configuration file
  • %Program Files%\baidu\sumpod-nos.sys - detected as TROJ_GORIADU.SMM
  • %Program Files%\baidu\sumpod.sys - detected as TROJ_GORIADU.SMM
  • %Program Files%\baidu\SysDat.bin - TROJ_GORIADU.SMC configuration file
  • %Program Files%\baidu\msfsg.exe - detected as TROJ_GORIADU.SMX
  • %Program Files%\baidu\dsetup.exe - detected as TROJ_GORIADU.SMX

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

It creates the following folders:

  • %Program Files%\baidu

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

Other Details

This Trojan does the following:

  • It executes the file dsetup.exe, which installs the dropped components to the %System% directory.
  • The file dsetup.exe copies the configuration file of TROJ_GORIADU.SMM to the %Windows%\inf folder. It then copies the file sumpod.sys, which is detected as TROJ_GORIADU.SMM in the %System%\drivers directory. It registers sumpod.sys as a system service by creating the following registry key:

    HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\Passthru

  • It then copies and executes the following files to the %System% folder:
    • passthru.dll to passthru.dll
    • newnetgar.dll to idecomp.dll
  • It creates a folder named %System%\hardpol. It then creates and executes a copy of spass.dll and saves it as hardpol.dll. The new file, hardpol.dll, is also detected as TROJ_GORIADU.SMM.
  • It also creates the folder MyIEData in the created folder. It then copies the configuration file of TROJ_GORIADU.SMM into MyIEData.
  • TROJ_GORIADU.DRP deletes the initially dropped files in the %Program Files% directory after executing dsetup.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.. %Windows% is the Windows folder, which is usually C:\Windows or C:\WINNT.. %Program Files% is the default Program Files folder, usually C:\Program Files.)

SOLUTION

Minimum Scan Engine:

8.900

FIRST VSAPI PATTERN FILE:

7.796.11

FIRST VSAPI PATTERN DATE:

27 Jan 2011

VSAPI OPR PATTERN File:

7.797.00

VSAPI OPR PATTERN Date:

27 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.DRP

    • TROJ_GORIADU.SMX
    • TROJ_GORIADU.SMW
    • TROJ_GORIADU.SMC
    • TROJ_GORIADU.SMY
    • TROJ_GORIADU.SMM

Step 3

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
    • PassThru

Step 4

Search and delete this folder

[ Learn More ]
Please make sure you check the Search Hidden Files and Folders checkbox in the More advanced options option to include all hidden folders in the search result.
  • %Program Files%\baidu

Step 5

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