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TSPY_BANCOS.BWF

June 29, 2013
 Modified by: Mark Joseph Manahan
 ALIASES:

TrojanSpy:Win32/Bancos.AIP (Microsoft); Trojan.Win32.Generic!BT (Sunbelt)

 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

Infection Channel:

Downloaded from the Internet, Dropped by other malware

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:

13,824 bytes

File Type:

EXE

Memory Resident:

Yes

Initial Samples Received Date:

04 Oct 2012

Payload:

Modifies HOSTS file, Downloads files

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.

It may be downloaded from the following remote sites:

  • http://www.{BLOCKED}vision.pro/noticias/video-cne-escandalo7o.avi.exe

Installation

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

  • %User Temp%\office.exe

(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.)

Autostart Technique

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

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows\CurrentVersion\Run
Microsoft Office = "%User Temp%\office.exe"

Other System Modifications

This spyware adds the following registry entries:

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

Dropping Routine

This spyware drops the following files:

  • {Malware Path}\key.txt

HOSTS File Modification

This spyware adds the following strings to the Windows HOSTS file:

  • {BLOCKED}.{BLOCKED}.49.14 {BLOCKED}ibe.com.ve
  • {BLOCKED}.{BLOCKED}.49.14 www.{BLOCKED}ibe.com.ve
  • {BLOCKED}.{BLOCKED}.49.14 {BLOCKED}evenezuela.com
  • {BLOCKED}.{BLOCKED}.49.14 www.{BLOCKED}evenezuela.com
  • {BLOCKED}.{BLOCKED}.49.14 {BLOCKED}o.com
  • {BLOCKED}.{BLOCKED}.49.14 www.{BLOCKED}o.com
  • {BLOCKED}.{BLOCKED}.49.14 {BLOCKED}i.gob.ve
  • {BLOCKED}.{BLOCKED}.49.14 www.{BLOCKED|i.gob.ve
  • {BLOCKED}.{BLOCKED}.49.14 {BLOCKED}r.com.ve
  • {BLOCKED}.{BLOCKED}.49.14 www.{BLOCKED}r.com.ve
  • {BLOCKED}.{BLOCKED}.49.14 {BLOCKED}cial.com
  • {BLOCKED}.{BLOCKED}.49.14 www.{BLOCKED}cial.com

Other Details

This spyware attempts to access the following websites to download files, which are possibly malicious:

  • http://{BLOCKED}i.info/aso.php?usario={username}
  • http://{BLOCKED}i.info/phar.php?usario={username}
  • http://{BLOCKED}i.info//banwgites.txt

  SOLUTION

Minimum Scan Engine:

9.200

FIRST VSAPI PATTERN FILE:

9.440.05

FIRST VSAPI PATTERN DATE:

04 Oct 2012

VSAPI OPR PATTERN File:

9.441.00

VSAPI OPR PATTERN Date:

05 Oct 2012

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 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
    • Microsoft Office = %User Temp%\office.exe
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\System
    • EnableLUA = 0

Step 4

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.
  • key.txt
  • {malware path}\key.txt

Step 5

Remove these strings added by the malware/grayware/spyware in the HOSTS file

[ Learn More ]
    • {BLOCKED}.{BLOCKED}.49.14 {BLOCKED}ibe.com.ve
    • {BLOCKED}.{BLOCKED}.49.14 www.{BLOCKED}ibe.com.ve
    • {BLOCKED}.{BLOCKED}.49.14 {BLOCKED}evenezuela.com
    • {BLOCKED}.{BLOCKED}.49.14 www.{BLOCKED}evenezuela.com
    • {BLOCKED}.{BLOCKED}.49.14 {BLOCKED}o.com
    • {BLOCKED}.{BLOCKED}.49.14 www.{BLOCKED}o.com
    • {BLOCKED}.{BLOCKED}.49.14 {BLOCKED}i.gob.ve
    • {BLOCKED}.{BLOCKED}.49.14 www.{BLOCKED|i.gob.ve
    • {BLOCKED}.{BLOCKED}.49.14 {BLOCKED}r.com.ve
    • {BLOCKED}.{BLOCKED}.49.14 www.{BLOCKED}r.com.ve
    • {BLOCKED}.{BLOCKED}.49.14 {BLOCKED}cial.com
    • 199.175.49.14 www.{BLOCKED}cial.com
"

Step 6

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