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TROJ_TDSS.KARUL

October 08, 2012
 Analysis by: Karl Dominguez
 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

It enables the OS continue booting without crashing by replicating a particular system library. It is a component file of BKDR_TDSS. It is also responsible for loading the other component file, RTKT_TDSS.KARUD.

This Trojan may be dropped by other malware. It arrives as a component bundled with malware/grayware packages. It may be dropped by other malware.

It is a component of other malware.

  TECHNICAL DETAILS

File Size:

3,134 bytes

File Type:

DLL

Initial Samples Received Date:

06 Apr 2011

Arrival Details

This Trojan may be dropped by other malware.

It arrives as a component bundled with malware/grayware packages.

It may be dropped by the following malware:

  • BKDR_TDSS.KARU

Installation

This Trojan is a component of other malware.

Other Details

This Trojan does the following:

  • Enables the OS continue booting without crashing by replicating the system library kdcom.dll. This malware is a component file of BKDR_TDSS. This file has usually two versions, one for 32-bit and one for 64-bit systems. This file is also responsible for loading the other component file RTKT_TDSS.KARUD.

  SOLUTION

Minimum Scan Engine:

8.900

FIRST VSAPI PATTERN FILE:

7.956.14

FIRST VSAPI PATTERN DATE:

08 Apr 2011

VSAPI OPR PATTERN File:

7.957.00

VSAPI OPR PATTERN Date:

08 Apr 2011

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

Remove malware files dropped/downloaded by TROJ_TDSS.KARUL

Step 3

Scan your computer with your Trend Micro product to delete files detected as TROJ_TDSS.KARUL. 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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