ALIASES:

RDN/PWS-Banker!ba (McAfee); Trojan-Downloader.Win32.Banload.cenl (Kaspersky); Trojan.Win32.Generic!BT (Sunbelt); Trojan horse Downloader.Banload.CKBV (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: 312,320 bytes
File Type: EXE
Memory Resident: Yes
Initial Samples Received Date: 05 Apr 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 creates the following folders:

  • %Program Files%\6z0Q2F

(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
anna-cws30764 = "%Program Files%\6z0Q2F\3F5K7W.exe"

Other System Modifications

This Trojan adds the following registry keys:

HKEY_CURRENT_USER\Software\Microsoft\
WinNT

It adds the following registry entries:

HKEY_CURRENT_USER\Software\Microsoft\
WinNT
01 = "D257D37387BC6A9641EB137F88BF63985DEB71BFBA5AD45A8688FC01789AC7C210B156"

HKEY_CURRENT_USER\Software\Microsoft\
WinNT
VS = "2C1C170571E157FE39D3729F"

It modifies the following registry entries:

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
SystemCertificates\CA\Certificates\
FE622EA7B33CA46519AB39736A66B8F6E41FF157
Blob = "{random values}"

(Note: The default value data of the said registry entry is {random values}.)

Dropping Routine

This Trojan drops the following files:

  • %Program Files%\6z0Q2F\8f8k0R6G5X.7Y1U1F0l
  • %Program Files%\6z0Q2F\primeiro.hlp
  • %Program Files%\6z0Q2F\segundo.hlp

(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).)

Other Details

This Trojan connects to the following possibly malicious URL:

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\Microsoft
    • WinNT

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
    • anna-cws30764 = "%Program Files%\6z0Q2F\3F5K7W.exe"
  • In HKEY_CURRENT_USER\Software\Microsoft\WinNT
    • 01 = "D257D37387BC6A9641EB137F88BF63985DEB71BFBA5AD45A8688FC01789AC7C210B156"
  • In HKEY_CURRENT_USER\Software\Microsoft\WinNT
    • VS = "2C1C170571E157FE39D3729F"

Step 5

Restore these modified registry values

[ Learn More ]

Important:Editing the Windows Registry incorrectly can lead to irreversible system malfunction. Please do this only if you know how to or you can seek your system administrator's help. You may also check out this Microsoft article first before modifying your computer's registry.

  • In HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\SystemCertificates\CA\Certificates\FE622EA7B33CA46519AB39736A66B8F6E41FF157
    • From: Blob = "{random values}"
      To: Blob = ""{random values}""

Step 6

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.
  • %Program Files%\6z0Q2F\8f8k0R6G5X.7Y1U1F0l
  • %Program Files%\6z0Q2F\primeiro.hlp
  • %Program Files%\6z0Q2F\segundo.hlp

Step 7

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%\6z0Q2F

Step 8

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