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JS_DLOADR.AU

October 08, 2012
 Analysis by: Christopher Daniel So
 ALIASES:

TrojanDownloader:JS/Qakbot.F (Microsoft)

 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 executes the downloaded files. As a result, malicious routines of the downloaded files are exhibited on the affected system.

  TECHNICAL DETAILS

File Size:

6,126 bytes

File Type:

Script

Memory Resident:

No

Initial Samples Received Date:

22 Nov 2010

Payload:

Downloads files

Download Routine

This Trojan accesses the following websites to download files:

  • http://{BLOCKED}rv.co.in/1
  • http://{BLOCKED}rv.co.in/21
  • http://{BLOCKED}1.co.in/1
  • http://{BLOCKED}1.co.in/21
  • http://{BLOCKED}2.co.in/1
  • http://{BLOCKED}2.co.in/21
  • http://{BLOCKED}3.in/1
  • http://{BLOCKED}3.in/21
  • http://{BLOCKED}3.com.ua/1
  • http://{BLOCKED}3.com.ua/21

It saves the files it downloads using the following names:

  • %User Temp%\S8XzxA.exe
  • %User Temp%\OUlEB.dll

(Note: %User Temp% is the current user's Temp folder, which is usually C:\Documents and Settings\{user name}\Local Settings\Temp on Windows 2000, XP, and Server 2003.)

Trend Micro detects the dowloaded file as:

  • BKDR_QAKBOT.SME

It then executes the downloaded files. As a result, malicious routines of the downloaded files are exhibited on the affected system.

  SOLUTION

Minimum Scan Engine:

8.900

FIRST VSAPI PATTERN FILE:

7.640.10

FIRST VSAPI PATTERN DATE:

22 Nov 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

Remove malware files dropped/downloaded by JS_DLOADR.AU

    BKDR_QAKBOT.SME

Step 3

Scan your computer with your Trend Micro product to delete files detected as JS_DLOADR.AU. 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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