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TROJ_BUZUS.AOT

May 14, 2013
 ALIASES:

VirTool:Win32/DelfInject.gen!BI (Microsoft); Trojan.Gen (Symantec); Trojan.Win32.Buzus.gtjm (Kaspersky); Trojan.Win32.Buzus (Sunbelt); Trojan horse Delf.VLJ (AVG)

 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:

1,818,624 bytes

File Type:

EXE

Memory Resident:

Yes

Initial Samples Received Date:

14 May 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.

Installation

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

  • %Program Files%\Microsoft\syser.exe

(Note: %Program Files% is the default Program Files folder, usually C:\Program Files in Windows 2000, Server 2003, and XP (32-bit), Vista (32-bit), and 7 (32-bit), or C:\Program Files (x86) in Windows XP (64-bit), Vista (64-bit), and 7 (64-bit).)

It creates the following folders:

  • %Program Files%\Microsoft

(Note: %Program Files% is the default Program Files folder, usually C:\Program Files in Windows 2000, Server 2003, and XP (32-bit), Vista (32-bit), and 7 (32-bit), or C:\Program Files (x86) in Windows XP (64-bit), Vista (64-bit), and 7 (64-bit).)

Autostart Technique

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

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows\CurrentVersion\Run
Adobe Update = "%Program Files%\Microsoft\syser.exe"

HKEY_CURRENT_USER\Software\Microsoft\
Windows\CurrentVersion\Run
Adobe Update = "%Program Files%\Microsoft\syser.exe"

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Active Setup\Installed Components\{63NNFX26-5C1R-401Q-14ER-RN1GF7715JP8}
StubPath = "%Program Files%\Microsoft\syser.exe restart"

HKEY_CURRENT_USER\Software\Microsoft\
Windows\CurrentVersion\Run
Adobe Update = "%Program Files%\Internet Explorer\iexplore.exe"

Other System Modifications

This Trojan adds the following registry keys:

HKEY_CURRENT_USER\Software\Configs

HKEY_LOCAL_MACHINE\Software\Microsoft\
Active Setup\Installed Components\{63NNFX26-5C1R-401Q-14ER-RN1GF7715JP8}

It adds the following registry entries:

HKEY_CURRENT_USER\Software\Configs
MyConfigs = "{random characters}"

HKEY_CURRENT_USER\Software\Configs
InstalledServer = "{malware path and file name}"

Dropping Routine

This Trojan drops the following files:

  • Temp.htm
  • %User Temp%\1.html

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

This report is generated via an automated analysis system.

  SOLUTION

Minimum Scan Engine:

9.300

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

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
    • Configs
  • In HKEY_LOCAL_MACHINE\Software\Microsoft\Active Setup\Installed Components
    • {63NNFX26-5C1R-401Q-14ER-RN1GF7715JP8}

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.

  • In HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Run
    • Adobe Update = "%Program Files%\Microsoft\syser.exe"
  • In HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Run
    • Adobe Update = "%Program Files%\Microsoft\syser.exe"
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Active Setup\Installed Components\{63NNFX26-5C1R-401Q-14ER-RN1GF7715JP8}
    • StubPath = "%Program Files%\Microsoft\syser.exe restart"
  • In HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Run
    • Adobe Update = "%Program Files%\Internet Explorer\iexplore.exe"
  • In HKEY_CURRENT_USER\Software\Configs
    • MyConfigs = "{random characters}"
  • In HKEY_CURRENT_USER\Software\Configs
    • InstalledServer = "{malware path and file name}"

Step 5

Search and delete these components

[ Learn More ]
There may be some components 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.htm
  • %User Temp%\1.html

Step 6

Search and delete this folder

[ 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.
  • %Program Files%\Microsoft

Step 7

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