ALIASES:

Trojan:WinNT/Bancos.G (Microsoft); PolyPatch-UPX (McAfee); Adware.Websearch (Symantec); Trojan-Downloader.Win32.Homa.fky (Kaspersky); Trojan.Win32.Generic.pak!cobra (Sunbelt); Dropped:Generic.Banker.Delf.2C06CB5A (FSecure)

 PLATFORM:

Windows 2000, Windows XP, Windows Server 2003

 OVERALL RISK RATING:
 REPORTED INFECTION:
 SYSTEM IMPACT RATING:
 INFORMATION EXPOSURE:

  • Threat Type: Spyware

  • Destructiveness: No

  • Encrypted:

  • In the wild: Yes

  OVERVIEW

This spyware 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: 6,091,776 bytes
File Type: EXE
Memory Resident: Yes
Initial Samples Received Date: 10 May 2012

Arrival Details

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

  • %Application Data%\ctfmonn.exe

(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 spyware adds the following registry entries to enable its automatic execution at every system startup:

HKEY_CURRENT_USER\Software\Microsoft\
Windows\CurrentVersion\Run
{malware file name} = "{malware path and file name}"

Other System Modifications

This spyware adds the following registry keys:

HKEY_CURRENT_USER\ctfmonn

HKEY_CURRENT_USER\EnableLUA

It adds the following registry entries:

HKEY_CURRENT_USER\EnableLUA
SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\System = "0"

HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\
Services\pelodlo
ImagePath = "system32\drivers\trs.sys"

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows\CurrentVersion\policies\
system
EnableLUA = "0"

Dropping Routine

This spyware drops the following files:

  • %System%\drivers\trs.sys
  • %System Root%\logwindp.txt

(Note: %System% is the Windows system folder, which is usually C:\Windows\System on Windows 98 and ME, C:\WINNT\System32 on Windows NT and 2000, or C:\Windows\System32 on Windows XP and Server 2003.. %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

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
    • ctfmonn
  • In HKEY_CURRENT_USER
    • EnableLUA

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
    • {malware file name} = "{malware path and file name}"
  • In HKEY_CURRENT_USER\EnableLUA
    • SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\System = "0"
  • In HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\Services\pelodlo
    • ImagePath = "system32\drivers\trs.sys"
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\policies\system
    • EnableLUA = "0"

Step 5

Search and delete these files

[ 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%\drivers\trs.sys
  • %System Root%\logwindp.txt

Step 6

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


Did this description help? Tell us how we did.