Analysis by: jont
 PLATFORM:

Windows 2000, Windows XP, Windows 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 connects to the certain URL(s) to download its component file(s).

  TECHNICAL DETAILS

File Size: 91,648 bytes
File Type: PE
Memory Resident: Yes
Initial Samples Received Date: 30 Nov 2010
Payload: Downloads files

Installation

This Trojan injects threads into the following normal process(es):

  • Explorer.exe

Autostart Technique

This Trojan drops the following file(s) in the Windows Startup folder to enable its automatic execution at every system startup:

  • chkntfs.exe

Download Routine

This Trojan connects to the following URL(s) to download its component file(s):

  • http://{BLOCKED}ntryit.us/cfg/imp
  • http://{BLOCKED}ntryit.us/cfg/miniav.plug
  • http://{BLOCKED}ntryit.us/cfg/passw.plug
  • http://{BLOCKED}ntryit.us/cfg/stopav.plug

  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

Restart in Safe Mode

[ Learn More ]

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 Startup%\chkntfs.exe

Step 4

Restart in normal mode and scan your computer with your Trend Micro product for files detected as TROJ_CARBERP.AC. 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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