Analysis by: Anthony Joe Melgarejo

ALIASES:

W32.Waledac.C!gen3 (Symantec), TR/Kazy.123032.53 (Antivir), Trojan-PWS.Win32.Tepfer (Ikarus)

 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.

  TECHNICAL DETAILS

File Size: 44,544 bytes
File Type: EXE
Memory Resident: Yes
Initial Samples Received Date: 28 Dec 2012

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 accesses the following websites to download files:

  • http://{BLOCKED}iv.ru/rasta01.exe
  • http://{BLOCKED}ys.ru/rasta01.exe

It saves the files it downloads using the following names:

  • %Temp%\temp{random number}.exe

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

  SOLUTION

Minimum Scan Engine: 9.300
FIRST VSAPI PATTERN FILE: 9.642.05
FIRST VSAPI PATTERN DATE: 07 Jan 2013
VSAPI OPR PATTERN File: 9.643.00
VSAPI OPR PATTERN Date: 08 Jan 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

Identify and terminate files detected as TROJ_WALEDAC.DCD

[ Learn More ]
  1. Windows Task Manager may not display all running processes. In this case, please use a third-party process viewer, preferably Process Explorer, to terminate the malware/grayware/spyware file. You may download the said tool here.
  2. If the detected file is displayed in either Windows Task Manager or Process Explorer but you cannot delete it, restart your computer in safe mode. To do this, refer to this link for the complete steps.
  3. If the detected file is not displayed in either Windows Task Manager or Process Explorer, continue doing the next steps.

Step 3

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.  
  • %Temp%\temp{random number}.exe

Step 4

Search and delete the file detected as TROJ_WALEDAC.DCD

[ Learn More ]
Please make sure you check the Search Hidden Files and Folders checkbox in the More advanced options option to include all hidden files in the search result.

Step 5

Scan your computer with your Trend Micro product to delete files detected as TROJ_WALEDAC.DCD. 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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