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TROJ_DROPPER.XFO

October 04, 2012
 ALIASES:

BackDoor-DNT (McAfee); Trojan.Gen (Symantec); BehavesLike.Win32.Malware.ssc (mx-v) (Sunbelt)

 PLATFORM:

Windows 2000, Windows XP, Windows Server 2003

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

  • Threat Type: Trojan

  • Destructiveness: No

  • Encrypted:

  • 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 modifies files, disabling programs and applications from properly running.

It deletes itself after execution.

  TECHNICAL DETAILS

File Size:

31,744 bytes

File Type:

EXE

Memory Resident:

No

Initial Samples Received Date:

04 Oct 2012

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:

  • %System%\spo0lsv.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.)

Other System Modifications

This Trojan modifies the following files:

  • %System Root%\boot.ini

(Note: %System Root% is the root folder, which is usually C:\. It is also where the operating system is located.)

It deletes the following files:

  • %System%\windons.dll
  • %System%\dllcache\ws2_32.dll
  • %System%\bel.bat

(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.)

Dropping Routine

This Trojan drops the following files:

  • %System%\winji1.dat
  • %System%\regs.dat
  • %System%\subs.dat
  • %System%\noise0.dat
  • %System%\bel.dat
  • %System%\ws2_32.dll
  • %System%\dllcache\ws2_32.dll

(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.)

Other Details

This Trojan deletes itself after execution.

This report is generated via an automated analysis system.

  SOLUTION

Minimum Scan Engine:

9.200

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

Search and delete these files

[ Learn More ]
There may be some component files that are hidden. Please make sure you check the Search Hidden Files and Folders checkbox in the "More advanced options" option to include all hidden files and folders in the search result.
  • %System%\winji1.dat
  • %System%\regs.dat
  • %System%\subs.dat
  • %System%\noise0.dat
  • %System%\bel.dat
  • %System%\ws2_32.dll
  • %System%\dllcache\ws2_32.dll

Step 3

Scan your computer with your Trend Micro product to delete files detected as TROJ_DROPPER.XFO. 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.

Step 4

Restore deleted/modified files and/or registry entries from backup

*Note: Only Microsoft-related files/keys/values will be restored. If this malware/grayware also deleted registry keys/values related to programs that are not from Microsoft, please reinstall those programs on your computer.

    • %System Root%\boot.ini

Step 5

Restore this file from backup only Microsoft-related files will be restored. If this malware/grayware also deleted files related to programs that are not from Microsoft, please reinstall those programs on you computer again.

  • %System%\windons.dll
  • %System%\dllcache\ws2_32.dll
  • %System%\bel.bat


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