WORM_BUZUS.SMX

October 23, 2013
 Analysis by: JasperM
 PLATFORM:

Windows 2000, XP, Server 2003

 OVERALL RISK RATING:
 DISTRIBUTION POTENTIAL:
 REPORTED INFECTION:

  • Threat Type: Worm

  • Destructiveness: No

  • Encrypted:

  • In the wild: Yes

  OVERVIEW

This worm arrives by connecting affected removable drives to a system. It may be dropped by other malware. It may be unknowingly downloaded by a user while visiting malicious websites.

It drops copies of itself into all the removable drives connected to an affected system.

  TECHNICAL DETAILS

File Size:

Varies

File Type:

PE

Memory Resident:

Yes

Initial Samples Received Date:

21 Jul 2010

Payload:

Downloads files, Connects to URLs/Ips, Drops files

Arrival Details

This worm arrives by connecting affected removable drives to a system.

It may be dropped by other malware.

It may be unknowingly downloaded by a user while visiting malicious websites.

Installation

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

  • %Application Data%\ohydy.exe

(Note: %Application Data% is the current user's Application Data folder, which is usually C:\Documents and Settings\{user name}\Application Data on Windows 2000, XP, and Server 2003, or C:\Users\{user name}\AppData\Roaming on Windows Vista and 7.)

It is injected into the following processes running in memory:

  • EXPLORER.EXE

Autostart Technique

This worm adds the following registry entries to enable its automatic execution at every system startup:

HKEY_LOCAL_MACHINE\Software\Microsoft\
Windows NT\CurrentVersion\Winlogon
Taskman = %Application Data%\ohydy.exe

Propagation

This worm drops copies of itself into all the removable drives connected to an affected system.

It sends copies of itself to target recipients using the following instant-messaging (IM) applications:

  • MSN Messenger

Other Details

Based on analysis of the codes, it has the following capabilities:

  • It can propagate through email.
  • It connects to the following server by opening random UDP ports:
    • ff.{BLOCKED}.com
    • ff.{BLOCKED}12terra.com
    • ff.{BLOCKED}ter50.com
    • ff.{BLOCKED}m.com
    • ff.{BLOCKED}u3.com
  • The reply may contain command to visit the following websites to download other malicious files:
    • http://{BLOCKED}9.92.250/pr.exe - detected as WORM_BUZUS.ARR
    • http://{BLOCKED}on.com/backbot.exe - detected as TROJ_PUVBED.Z
    • http://{BLOCKED}on.com/loaderadv600.exe - detected as TROJ_BURNIX.SMEP
    • http://{BLOCKED}dat.info/rp020832.exe - detected as TROJ_CUTWAIL.SMQ

  SOLUTION

Minimum Scan Engine:

8.900

VSAPI PATTERN File:

7.331.00

VSAPI PATTERN Date:

22 Jul 2010

VSAPI PATTERN Date:

7/22/2010 12:00:00 AM

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

Restart in Safe Mode

[ Learn More ]

Step 3

Remove the malware/grayware file dropped/downloaded by WORM_BUZUS.SMX

Step 4

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.

RESTORE
  • Close Registry Editor.

    • Step 5

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