ALIASES:

Trojan.Dropper (Symantec); Backdoor.Win32.Zegost.sth (Kaspersky); Trojan.Win32.Generic!BT (Sunbelt); Trojan horse Downloader.Generic13.ARGQ (AVG)

 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.

  TECHNICAL DETAILS

File Size: 737,435 bytes
File Type: EXE
Memory Resident: No
Initial Samples Received Date: 24 May 2013

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.

Other System Modifications

This Trojan modifies the following file(s):

  • %System%\MSWINSCK.ocx

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

Dropping Routine

This Trojan drops the following files:

  • %Windows%\svchost.exe
  • %Windows%\SysWOW64\MSWINSCK.ocx

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

Other Details

This Trojan connects to the following possibly malicious URL:

  • http://g123p.{BLOCKED}y.com/attachment/cfile21.uf@231B504E5199D265298FCE.exe
  • http://pds25.{BLOCKED}s.com/pds/201304/27/64/mswinsck.ocx

This report is generated via an automated analysis system.

  SOLUTION

Minimum Scan Engine: 9.300

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

Search and delete these components

[ Learn More ]
There may be some components 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.
  • %Windows%\svchost.exe
  • %Windows%\SysWOW64\MSWINSCK.ocx

Step 3

Scan your computer with your Trend Micro product to delete files detected as TROJ_DARKSHEL.AW. 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%\MSWINSCK.ocx


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