TROJ_DROPPR.CK

July 15, 2013
 Analysis by: Kathleen Notario
 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 executes the dropped file(s). As a result, malicious routines of the dropped files are exhibited on the affected system.

It deletes itself after execution.

  TECHNICAL DETAILS

File Size:

71,680 bytes

File Type:

PE

Memory Resident:

No

Initial Samples Received Date:

22 Aug 2010

Payload:

Drops files

Installation

This Trojan adds the following folders:

  • D:\ssshall

Dropping Routine

This Trojan drops the following files:

  • %System%\{random filename1}.dll - detected as TROJ_ADLOAD.RE
  • %System%\{random filename2}.dll - detected as TROJ_ADLOAD.RE
  • %System%\{random filename3}.dll - detected as TROJ_ADLOAD.RE
  • %System%\{random filename4}.exe - detected as TROJ_FLYMUX.I
  • %System%\dllcache\{random filename1}.dll - detected as TROJ_ADLOAD.RE

(Note: %System% is the Windows system folder, which is usually C:\Windows\System32.)

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

Other Details

This Trojan deletes itself after execution.

  SOLUTION

Minimum Scan Engine:

8.900

VSAPI OPR PATTERN File:

7.402.06

VSAPI OPR PATTERN Date:

22 Aug 2010

Step 1

Before doing any scans, Windows XP, Windows Vista, and Windows 7 users must disable System Restore to allow full scanning of their computers.

Step 2

Remove the malware/grayware file dropped/downloaded by TROJ_DROPPR.CK

    TROJ_ADLOAD.RE
    TROJ_FLYMUX.I

Step 3

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. D:\ssshall

Step 4

Scan your computer with your Trend Micro product to delete files detected as TROJ_DROPPR.CK. 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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