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TROJ_TDSS.KAX

August 31, 2010
 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: No

  • In the wild: Yes

  OVERVIEW


Trend Micro has flagged this malware as noteworthy due to the increased potential for damage, propagation, or both, that it possesses. Specifically, this TDSS/alurion variant works in 64-bit systems.

To get a one-glance comprehensive view of the behavior of this Trojan, refer to the Threat Diagram shown below.

This Trojan may be unknowingly downloaded by a user while visiting malicious websites.

It connects to certain websites to send and receive information.

  TECHNICAL DETAILS

File Size:

126,464 bytes

File Type:

PE

Memory Resident:

Yes

Initial Samples Received Date:

30 Aug 2010

Payload:

Connects to URLs/Ips, Hides files and processes

Arrival Details

This Trojan may be unknowingly downloaded by a user while visiting malicious websites.

Installation

This Trojan drops the following copies of itself into the affected system:

  • %UserTemp%\{temporary file name}.tmp

Other Details

Based on analysis of the codes, it has the following capabilities:

  • Hides the following files:
    • cfg.ini
    • mbr
    • ldr16
    • ldr32
    • ldr64
    • drv32
    • drv64
    • cmd.dll
    • cmd64.dll
    • bckfg.tmp
  • Modifies the master boot record (MBR) of the affected system to enable automatic loading at startup

It connects to the following website to send and receive information:

  • https://{BLOCKED}b6.com/
  • https://{BLOCKED}.{BLOCKED}.20.132/
  • https://{BLOCKED}lm94.asia
  • https://{BLOCKED}.{BLOCKED}.20.135/
  • https://{BLOCKED}ka.in/
  • https://{BLOCKED}anno.in/
  • http://{BLOCKED}71gg1.cc/
  • http://{BLOCKED}ha644.com/
  • http://{BLOCKED}357.cn/
  • http://{BLOCKED}922.cn/
  • http://{BLOCKED}4555j.com/
  • http://{BLOCKED}i813ck.com/

  SOLUTION

Minimum Scan Engine:

8.900

FIRST VSAPI PATTERN FILE:

7.422.03

FIRST VSAPI PATTERN DATE:

30 Aug 2010

VSAPI OPR PATTERN File:

7.353.00

VSAPI OPR PATTERN Date:

01 Sep 2010

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

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