Analysis by: Merianne Polintan
ALIASES:

TrojanDownloader:Win32/Vundo.J(Microsoft),Troj/Mdrop-ETG(Sophos),Trojan.Vundo.HAF(Bitdefender),W32/Cidox.ADTB!tr(Fortinet),Win32/Citirevo.AE trojan(Nod32)

 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 requires its main component to successfully perform its intended routine.

  TECHNICAL DETAILS

File Size: 48,128 bytes
File Type: DLL
Memory Resident: Yes
Initial Samples Received Date: 10 Apr 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.

Other Details

This Trojan connects to the following possibly malicious URL:

  • {BLOCKED}ilzip.com/phpbb/js.php
  • www.{BLOCKED}x.ru
  • {BLOCKED}ip.com/phpbb/get.php?id={Value}
  • {BLOCKED}ast.com/phpbb/get.php?id={Value}
  • {BLOCKED}1etag.com/phpbb/get.php?id={Value}
  • {BLOCKED}all.com/phpbb/get.php?id={Value}
  • {BLOCKED}nda.com/phpbb/get.php?id={Value}
  • {BLOCKED}nma.com/phpbb/get.php?id={Value}
  • {BLOCKED}mva.com/phpbb/get.php?id={Value}
  • {BLOCKED}ix.com/phpbb/get.php?id={Value}
  • {BLOCKED}od.com/phpbb/get.php?id={Value}
  • {BLOCKED}rns.com/phpbb/get.php?id={Value}
  • {BLOCKED}ip.com/phpbb/get.php?id={Value}
  • {BLOCKED}it.com/phpbb/get.php?id={Value}
  • {BLOCKED}ets.com/phpbb/get.php?id={Value}
  • {BLOCKED}su.com/phpbb/get.php?id={Value}
  • {BLOCKED}des.com/phpbb/get.php?id={Value}
  • {BLOCKED}ns.com/phpbb/get.php?id={Value}
  • {BLOCKED}ck.com/phpbb/get.php?id={Value}
  • {BLOCKED}ad.com/phpbb/get.php?id={Value}
  • {BLOCKED}ra.com/phpbb/get.php?id={Value}
  • {BLOCKED}s.su/phpbb/get.php?id={Value}
  • {BLOCKED}tano.com/phpbb/get.php?id={Value}
  • {BLOCKED}click.com/phpbb/get.php?id={Value}
  • {BLOCKED}eta.ru/phpbb/get.php?id={Value}
  • {BLOCKED}e1.com/phpbb/get.php?id={Value}
  • {BLOCKED}lans.ru/phpbb/get.php?id={Value}
  • {BLOCKED}.{BLOCKED}.35.154/phpbb/get.php?id={Value}
  • {BLOCKED}szip.com/phpbb/post.php?id={Value}

It requires its main component to successfully perform its intended routine.

  SOLUTION

Minimum Scan Engine: 9.300
FIRST VSAPI PATTERN FILE: 9.850.06
FIRST VSAPI PATTERN DATE: 01 Mar 2013
VSAPI OPR PATTERN File: 9.851.00
VSAPI OPR PATTERN Date: 01 Mar 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

Scan your computer with your Trend Micro product and note files detected as TROJ_VUNDO.FZA

Step 3

Restart in Safe Mode

[ Learn More ]

Step 4

Search and delete the files detected as TROJ_VUNDO.FZA

*Note: Some component files may be 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.

To stop the malware/grayware from running when certain files are opened:

For Windows 2000, Windows XP, and Windows Server 2003:

  1. Right-click Start then click Search....
  2. In the Named input box, type the name of the file that was detected earlier.
  3. In the Look In drop-down list, select My Computer then press Enter.
  4. Once located, select the file then press SHIFT+DELETE to delete it.

For Windows Vista and Windows 7:

  1. Click Start>Computer.
  2. In the Search Computer input box, type the name of the file detected earlier, and press Enter.
  3. Once located, select the file then press SHIFT+DELETE to delete it.
    *Note: Read the following Microsoft page if these steps do not work on Windows 7.

Step 5

Restart in normal mode and scan your computer with your Trend Micro product for files detected as TROJ_VUNDO.FZA. 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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