TSPY_DROPSKIM.D

February 20, 2015
 Analysis by: kathleenno
 Modified by: Cris Nowell Pantanilla
 ALIASES:

Trojan.Dropper (Symantec); Generic Dropper.p (Mcafee); W32/Dropper.P!tr (Fortinet); Trojan-Dropper (Ikarus)

 PLATFORM:

Windows

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

  • Threat Type: Spyware

  • Destructiveness: No

  • Encrypted: No

  • In the wild: Yes

  OVERVIEW

This spyware arrives on a system as a file dropped by other malware or as a file downloaded unknowingly by users when visiting malicious sites.

  TECHNICAL DETAILS

File Size:

55,296 bytes

File Type:

EXE

Memory Resident:

No

Initial Samples Received Date:

23 Jun 2011

Arrival Details

This spyware 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 spyware drops the following files:

  • %System Root%\DieBold\DLL\DFCDrgr.dll - TSPY_SKIMER.D
  • %System%\servicerg.exe - TSPY_SKIMER.D

(Note: %System Root% is the Windows root folder, where it usually is C:\ on all Windows operating system versions.. %System% is the Windows system folder, where it usually is C:\Windows\System32 on all Windows operating system versions.)

It drops the following non-malicious files:

  • %System%\tst.dat
  • %System Root%\Diebold\Dll\tst.dat

(Note: %System% is the Windows system folder, where it usually is C:\Windows\System32 on all Windows operating system versions.. %System Root% is the Windows root folder, where it usually is C:\ on all Windows operating system versions.)

Other Details

This spyware adds and runs the following services:

HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\
Services\servicerg

  SOLUTION

Minimum Scan Engine:

8.900

FIRST VSAPI PATTERN FILE:

8.242.06

FIRST VSAPI PATTERN DATE:

23 Jun 2011

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 TSPY_DROPSKIM.D. (Note: Please skip this step if the threat(s) listed below have already been removed.)

     TSPY_SKIMER.D

Step 3

Search and delete this file

[ Learn More ]
There may be some 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%\tst.dat
  • %System Root%\Diebold\Dll\tst.dat

Step 4

Scan your computer with your Trend Micro product to delete files detected as TSPY_DROPSKIM.D. 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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