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TROJ_DRPR.AL

October 08, 2012
 Analysis by: JasperM
 PLATFORM:

Windows 2000, XP, 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 other malware. It may be unknowingly downloaded by a user while visiting malicious websites.

It executes the dropped file(s). As a result, malicious routines of the dropped files are exhibited on the affected system.

  TECHNICAL DETAILS

File Size:

2,475,165 bytes

File Type:

PE

Memory Resident:

No

Initial Samples Received Date:

16 Sep 2010

Payload:

Drops files

Arrival Details

This Trojan may be dropped by other malware.

It may be unknowingly downloaded by a user while visiting malicious websites.

Installation

This Trojan drops and executes the following files:

  • %User Temp%\softpro.dll - detected as TROJ_STARTPA.SW
  • %User Temp%\sogou_pinyin_mini_5254.exe
  • %User Temp%\silentOverwrite - empty file
  • %User Temp%\Baidu-Toolbar.exe
  • %User Temp%\SeFastInstall2_3290.exe
  • %User Temp%\coopen_setup_100225.exe
  • %User Temp%\install.tmp - encrypted file used by SOFTPRO.DLL

(Note: %User Temp% is the current user's Temp folder, which is usually C:\Documents and Settings\{user name}\Local Settings\Temp on Windows 2000, XP, and Server 2003.)

Dropping Routine

This Trojan executes the dropped file(s). As a result, malicious routines of the dropped files are exhibited on the affected system.

Other Details

Based on analysis of the codes, it has the following capabilities:

  • Displays advertisements and toolbars because of the following dropped files:
    • %User Temp%\sogou_pinyin_mini_5254.exe
    • %User Temp%\Baidu-Toolbar.exe
    • %User Temp%\SeFastInstall2_3290.exe
    • %User Temp%\coopen_setup_100225.exe
    The said files may or may not be malicious, depending on how users view them when executed.

(Note: %User Temp% is the current user's Temp folder, which is usually C:\Documents and Settings\{user name}\Local Settings\Temp on Windows 2000, XP, and Server 2003.)

  SOLUTION

Minimum Scan Engine:

8.900

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_DRPR.AL

    • TROJ_STARTPA.SW

Step 3

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.
  • %User Temp%\sogou_pinyin_mini_5254.exe
  • %User Temp%\Baidu-Toolbar.exe
  • %User Temp%\SeFastInstall2_3290.exe
  • %User Temp%\coopen_setup_100225.exe

Step 4

Scan your computer with your Trend Micro product to delete files detected as TROJ_DRPR.AL. 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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