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TROJ_ZBOT.BAF

October 09, 2012
 Analysis by: Christopher Daniel So
 Modified by: Erika Bianca Mendoza
 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

As of this writing, the said sites are inaccessible.

  TECHNICAL DETAILS

File Size:

172,032 bytes

File Type:

EXE

Memory Resident:

Yes

Initial Samples Received Date:

29 Apr 2010

Payload:

Creates files, Drops files, Connects to URLs/Ips

Arrival Details

This malware arrives via the following means:

  • may be dropped and executed by its main ZBOT component

Installation

This Trojan adds the following folders:

  • %Application Data%\Rudy

(Note: %Application Data% is the current user's Application Data folder, which is usually C:\Windows\Profiles\{user name}\Application Data on Windows 98 and ME, C:\WINNT\Profiles\{user name}\Application Data on Windows NT, and C:\Documents and Settings\{user name}\Local Settings\Application Data on Windows 2000, XP, and Server 2003.)

It drops the following non-malicious file:

  • %Application Data%\Rudy\teeb.tmp

(Note: %Application Data% is the current user's Application Data folder, which is usually C:\Windows\Profiles\{user name}\Application Data on Windows 98 and ME, C:\WINNT\Profiles\{user name}\Application Data on Windows NT, and C:\Documents and Settings\{user name}\Local Settings\Application Data on Windows 2000, XP, and Server 2003.)

Autostart Technique

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

HKEY_CURRENT_USER\Software\Microsoft\
Windows\CurrentVersion\Run
{1E4B2D16-BDE9-5695-E6A2-289F36546274} = %Application Data%\{6randomchars2}\{4randomchars}.exe

Other System Modifications

This Trojan adds the following registry keys:

HKEY_CURRENT_USER\Software\Microsoft\
{6randomchars}

It adds the following registry entries:

HKEY_CURRENT_USER\Software\Microsoft\
{6randomchars}
{random} = {hex values}

Download Routine

This Trojan connects to the following URL(s) to download its configuration file:

  • http://{BLOCKED}e.ru/syria2020.bin

As of this writing, the said sites are inaccessible.

NOTES:
The configuration file contains information that will be used for its information theft routine. This includes:

  • Web Injects
  • URLs related to financial institutions that will be monitored
  • URL where it downloads an updated copy of itself
  • Configuration file URL
  • Server where the stolen information will be sent

  SOLUTION

Minimum Scan Engine:

8.900

FIRST VSAPI PATTERN FILE:

7.136.16

FIRST VSAPI PATTERN DATE:

30 Apr 2010

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

Scan your computer with your Trend Micro product and note files detected as TROJ_ZBOT.BAF

Step 3

Restart in Safe Mode

[ Learn More ]

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_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Run
    • {1E4B2D16-BDE9-5695-E6A2-289F36546274} = %Application Data%\{6randomchars2}\{4randomchars}.exe

Step 5

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\Microsoft\
    • {6randomchars}

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. %Application Data%\Rudy

Step 7

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