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TROJ_CARBERP.B

October 08, 2012
 PLATFORM:

Windows 2000, XP, Server 2003

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

  • Threat Type: Trojan

  • Destructiveness: No

  • Encrypted: Yes

  • In the wild: Yes

  OVERVIEW

This Trojan connects to certain URLs. It may do this to remotely inform a malicious user of its installation. It may also do this to download possibly malicious files onto the computer, which puts the computer at a greater risk of infection by other threats.

  TECHNICAL DETAILS

File Size:

72,704 bytes

File Type:

EXE

Memory Resident:

Yes

Initial Samples Received Date:

02 Oct 2010

Installation

This Trojan adds the following processes:

  • %windows%\explorer.exe
  • %system%\svchost.exe

Autostart Technique

This Trojan drops the following files:

  • %user startup%\chkntfs.exe - copy of itself
  • %Application Data%\chkntfs.dat - non-malicious component

(Note: %Application Data% is the current user's Application Data folder, which is usually C:\Windows\Profiles\{user name}\Application Data on Windows 98 and ME, C:\WINNT\Profiles\{user name}\Application Data on Windows NT, and C:\Documents and Settings\{user name}\Local Settings\Application Data on Windows 2000, XP, and Server 2003.)

Download Routine

This Trojan connects to the following malicious URLs:

  • http://{BLOCKED}t.{BLOCKED}ts.com/cfg/miniav.plug
  • http:/{BLOCKED}t.{BLOCKED}ts.com/cfg/ebnkusod
  • http://{BLOCKED}t.{BLOCKED}ts.com/cfg/passw.plug
  • http://{BLOCKED}t.{BLOCKED}ts.com/cfg/stopav.plug

  SOLUTION

Minimum Scan Engine:

8.900

VSAPI PATTERN File:

07.508.02

VSAPI PATTERN Date:

02 Oct 2010

VSAPI PATTERN Date:

10/2/2010 12:00:00 AM

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

Search and delete this file

[ 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.
  • %Application Data%\chkntfs.dat

Step 3

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