ALIASES:

TrojanDownloader:Win32/Renos.PG (Microsoft); Downloader-CEW.ak (McAfee); Trojan.Gen.2 (Symantec); PAK:UPX (Kaspersky); Trojan.Win32.Generic!BT (Sunbelt); Trojan.Generic.5710356 (FSecure)

 PLATFORM:

Windows 2000, Windows XP, Windows Server 2003

 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: 162,304 bytes
File Type: EXE
Memory Resident: No
Initial Samples Received Date: 10 Nov 2011

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.

Installation

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

  • {malware path and file name}.exe
  • %Windows%\Vxazaa.exe

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

Other System Modifications

This Trojan adds the following registry keys:

HKEY_CURRENT_USER\Software\VXEG3ZNNE5

HKEY_CURRENT_USER\Software\Microsoft\
Windows\CurrentVersion\Internet Settings\
Zones\_CHAR(0x03)_

It adds the following registry entries:

HKEY_CURRENT_USER\Software\VXEG3ZNNE5
VlyE5 = 1

HKEY_CURRENT_USER\Software\VXEG3ZNNE5
VlyN = 1cc9d22

HKEY_CURRENT_USER\Software\VXEG3ZNNE5
VlyE = 87ca421

Dropping Routine

This Trojan drops the following files:

  • %Windows%\Tasks\{35DC3473-A719-4d14-B7C1-FD326CA84A0C}.job

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

This report is generated via an automated analysis system.

  SOLUTION

Minimum Scan Engine: 9.200

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

Delete this registry key

[ Learn More ]

Important: Editing the Windows Registry incorrectly can lead to irreversible system malfunction. Please do this step only if you know how or you can ask assistance from your system administrator. Else, check this Microsoft article first before modifying your computer's registry.

  • In HKEY_CURRENT_USER\Software
    • VXEG3ZNNE5
  • In HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Internet Settings\Zones
    • _CHAR(0x03)_

Step 3

Delete this registry value

[ Learn More ]

Important: Editing the Windows Registry incorrectly can lead to irreversible system malfunction. Please do this step only if you know how or you can ask assistance from your system administrator. Else, check this Microsoft article first before modifying your computer's registry.

  • In HKEY_CURRENT_USER\Software\VXEG3ZNNE5
    • VlyE5=1
  • In HKEY_CURRENT_USER\Software\VXEG3ZNNE5
    • VlyN=1cc9d22
  • In HKEY_CURRENT_USER\Software\VXEG3ZNNE5
    • VlyE=87ca421

Step 4

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. %Windows%\Tasks\{35DC3473-A719-4d14-B7C1-FD326CA84A0C}.job

Step 5

Scan your computer with your Trend Micro product to delete files detected as TROJ_RENOS.SMK3. 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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