TSPY_BANKER.YWNRB
TrojanSpy:Win32/Banker (Microsoft), Trojan-Banker.Win32.BestaFera.etr (Kaspersky)
Windows
Threat Type: Spyware
Destructiveness: No
Encrypted: Yes
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.
It attempts to steal information, such as user names and passwords, used when logging into certain banking or finance-related websites. It steals certain information from the system and/or the user.
TECHNICAL DETAILS
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:
- %User Temp%\SkyperSetup.exe
(Note: %User Temp% is the user's temporary folder, where it usually is C:\Documents and Settings\{user name}\Local Settings\Temp on Windows 2000, Windows Server 2003, and Windows XP (32- and 64-bit); C:\Users\{user name}\AppData\Local\Temp on Windows Vista (32- and 64-bit), Windows 7 (32- and 64-bit), Windows 8 (32- and 64-bit), Windows 8.1 (32- and 64-bit), Windows Server 2008, and Windows Server 2012.)
It drops the following component file(s):
- %User Temp%\INF.txt
- %User Temp%\cplWindows.txt
- %User Temp%\Registred.COM
(Note: %User Temp% is the user's temporary folder, where it usually is C:\Documents and Settings\{user name}\Local Settings\Temp on Windows 2000, Windows Server 2003, and Windows XP (32- and 64-bit); C:\Users\{user name}\AppData\Local\Temp on Windows Vista (32- and 64-bit), Windows 7 (32- and 64-bit), Windows 8 (32- and 64-bit), Windows 8.1 (32- and 64-bit), Windows Server 2008, and Windows Server 2012.)
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
BlueStacks = "%User Temp%\SkyperSetup.exe"
Information Theft
This spyware attempts to steal information from the following banks and/or other financial institutions:
- Banco Santander
- HSBC Bank Brasil S.A.
- Banco Bradesco S/A
It steals the following information:
- Username
- Password
- Card Number
- Card Validity
- Contact Infomation
- Agency
Stolen Information
This spyware sends the data it gathers to the following email addresses via SMTP:
- {BLOCKED}uilindo1090@gmail.com
- {BLOCKED}undesbitencourte@uol.com.br
- {BLOCKED}bashow10@gmail.com
- {BLOCKED}eiro-marineide@uol.com.br
SOLUTION
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
Identify and terminate files detected as TSPY_BANKER.YWNRB
- Windows Task Manager may not display all running processes. In this case, please use a third-party process viewer, preferably Process Explorer, to terminate the malware/grayware/spyware file. You may download the said tool here.
- If the detected file is displayed in either Windows Task Manager or Process Explorer but you cannot delete it, restart your computer in safe mode. To do this, refer to this link for the complete steps.
- If the detected file is not displayed in either Windows Task Manager or Process Explorer, continue doing the next steps.
Step 3
Delete this registry value
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
- BlueStacks = "%User Temp%\SkyperSetup.exe"
- BlueStacks = "%User Temp%\SkyperSetup.exe"
Step 4
Search and delete these files
Step 5
Scan your computer with your Trend Micro product to delete files detected as TSPY_BANKER.YWNRB. 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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