ALIASES:

Trojan:Win32/Delf.FY (Microsoft); BackDoor-EGJ (McAfee); W32.Palevo (Symantec); Trojan.Win32.Buzus.ilgr (Kaspersky); Trojan.Win32.Generic!BT (Sunbelt); Backdoor.IRCBot.ACTN (FSecure)

 PLATFORM:

Windows 2000, XP, Server 2003

 OVERALL RISK RATING:
 REPORTED INFECTION:

  • Threat Type: Worm

  • Destructiveness: No

  • Encrypted:

  • In the wild: Yes

  OVERVIEW

This worm 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: 33,280 bytes
File Type: EXE
Initial Samples Received Date: 30 Sep 2011

Arrival Details

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

  • %System Root%\RECYCLER\S-1-5-21-0243936033-3052116371-381863308-1811\vsbntlo.exe

(Note: %System Root% is the root folder, which is usually C:\. It is also where the operating system is located.)

It creates the following folders:

  • %System Root%\RECYCLER
  • %System Root%\RECYCLER\S-1-5-21-0243936033-3052116371-381863308-1811\

(Note: %System Root% is the root folder, which is usually C:\. It is also where the operating system is located.)

Other System Modifications

This worm deletes the following files:

  • %System Root%\RECYCLER\S-1-5-21-0243936033-3052116371-381863308-1811\vsbntlo.exe

(Note: %System Root% is the root folder, which is usually C:\. It is also where the operating system is located.)

It adds the following registry entries:

HKEY_CURRENT_USER\Software\Microsoft\
Windows\CurrentVersion\Run
12CFG214-K641-12SF-N85P = "%System Root%\RECYCLER\S-1-5-21-0243936033-3052116371-381863308-1811\vsbntlo.exe"

Dropping Routine

This worm drops the following files:

  • %System Root%\RECYCLER\S-1-5-21-0243936033-3052116371-381863308-1811\Desktop.ini

(Note: %System Root% is the root folder, which is usually C:\. It is also where the operating system is located.)

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 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\Microsoft\Windows\CurrentVersion\Run
    • 12CFG214-K641-12SF-N85P="%System Root%\RECYCLER\S-1-5-21-0243936033-3052116371-381863308-1811\vsbntlo.exe"

Step 3

Search and delete these folders

[ Learn More ]
Please make sure you check the Search Hidden Files and Folders checkbox in the More advanced options option to include all hidden folders in the search result.
  • %System Root%\RECYCLER
  • %System Root%\RECYCLER\S-1-5-21-0243936033-3052116371-381863308-1811\

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. %System Root%\RECYCLER\S-1-5-21-0243936033-3052116371-381863308-1811\Desktop.ini

Step 5

Scan your computer with your Trend Micro product to delete files detected as WORM_BUZUS.BCT. 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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