Analysis by: Rika Joi Gregorio
ALIASES:

TrojanDownloader:Win32/Waledac.R(Microsoft), a variant of Win32/Kryptik.BDII trojan(Eset)

 PLATFORM:

Windows 2000, Windows Server 2003, Windows XP (32-bit, 64-bit), Windows Vista (32-bit, 64-bit), Windows 7 (32-bit, 64-bit)

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

  • Threat Type: Trojan

  • Destructiveness: No

  • Encrypted:

  • In the wild: Yes

  OVERVIEW

This Trojan arrives on a system as a file dropped by other malware or as a file downloaded unknowingly by users when visiting malicious sites.

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

  TECHNICAL DETAILS

File Size: 19,456 bytes
File Type: EXE
Memory Resident: No
Initial Samples Received Date: 13 Jun 2013

Arrival Details

This Trojan arrives on a system as a file dropped by other malware or as a file downloaded unknowingly by users when visiting malicious sites.

Download Routine

This Trojan connects to the following website(s) to download and execute a malicious file:

  • http://paxodvy.com/newmay3.exe
  • http://hcj6i3su.urtokzi.com/calc.exe

It saves the files it downloads using the following names:

  • %Windows%\Temp\temp{random digit}.exe

(Note: %Windows% is the Windows folder, which is usually C:\Windows.)

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

Other Details

This Trojan connects to the following possibly malicious URL:

  • http://{BLOCKED}.41.222/main.htm
  • http://{BLOCKED}.41.222/default.htm

  SOLUTION

Minimum Scan Engine: 9.300
FIRST VSAPI PATTERN FILE: 9.978.03
FIRST VSAPI PATTERN DATE: 13 Jun 2013
VSAPI OPR PATTERN File: 9.979.00
VSAPI OPR PATTERN Date: 13 Jun 2013

Step 1

Before doing any scans, Windows XP, Windows Vista, and Windows 7 users must disable System Restore to allow full scanning of their computers.

Step 2

Search and delete these files

[ Learn More ]
There may be some 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.  
  • %Windows%\Temp\temp{random digit}.exe

Step 3

Scan your computer with your Trend Micro product to delete files detected as TROJ_DLOADE.WAD. 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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