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TSPY_TINBA.WRSA

June 26, 2015
 Analysis by: Anthony Joe Melgarejo
 PLATFORM:

Windows

 OVERALL RISK RATING:
 DAMAGE POTENTIAL:
 DISTRIBUTION POTENTIAL:
 REPORTED INFECTION:
 INFORMATION EXPOSURE:

  • Threat Type: Spyware

  • Destructiveness: No

  • Encrypted: Yes

  • In the wild: Yes

  OVERVIEW

Infection Channel:

Downloaded from the Internet


This is the detection for the latest variant of Tinba that hit certain countries in Europe. Tinba is dubbed as smallest banker Trojan due to its file size.

This Spyware may be unknowingly downloaded by a user while visiting malicious websites.

It retrieves specific information from the affected system.

  TECHNICAL DETAILS

File Size:

117,248 bytes

File Type:

EXE

Memory Resident:

Yes

Initial Samples Received Date:

26 Jun 2015

Payload:

Steals information

Arrival Details

This Spyware may be unknowingly downloaded by a user while visiting malicious websites.

Installation

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

  • %Application Data%\Fobber\nemre.exe

(Note: %Application Data% is the current user's Application Data folder, which is usually C:\Documents and Settings\{user name}\Application Data on Windows 2000, XP, and Server 2003, or C:\Users\{user name}\AppData\Roaming on Windows Vista, 7, and 8.)

It injects codes into the following process(es):

  • verclsid.exe
  • explorer.exe

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
Fobber = "%Application Data%\Fobber\nemre.exe"

Other System Modifications

This Spyware adds the following registry entries:

HKEY_CURRENT_USER\Software\Microsoft\
Internet Explorer\Main
TabProcGrowth = "1"

It modifies the following registry entries:

HKEY_CURRENT_USER\Software\Microsoft\
Windows\CurrentVersion\Internet Settings\
Zones\3
1609 = "0"

Information Theft

This Spyware gathers the following data:

  • Login Credentials to certain sites (please see below)

It retrieves the following information from the affected system:

  • Hard Disk Serial Number
  • OS Installation Date

Drop Points

Stolen information is uploaded to the following websites:

  • http://{pseudo-random domain}.net/iUx

NOTES:

It attempts to disable the SPDY protocol in Mozilla Firefox by dropping user.js in the Firefox profile folder %Application Data%\Mozilla\Firefox\Profiles\{profile folder}. However, the said file is truncated. Therefore, the malware is unsuccessful with its attempt to disable the protocol.

It generates several pseudo-random domains to contact its C& C server.

It may receive the following payloads from its C&C server:

  • Updated shellcode for process injection
  • Updated C& C server

It injects its code to the following web browsers' processes:

  • iexplore.exe
  • firefox.exe
  • chrome.exe

It hooks certain functions in the web browsers where it injected its code to steal login credentials (via man-in-the-middle attacks) from the following websites:

  • Microsoft
  • Google
  • Facebook
  • GMX
  • Live Messenger
  • Twitter

  SOLUTION

Minimum Scan Engine:

9.750

FIRST VSAPI PATTERN FILE:

11.754.05

FIRST VSAPI PATTERN DATE:

26 Jun 2015

VSAPI OPR PATTERN File:

11.755.00

VSAPI OPR PATTERN Date:

27 Jun 2015

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

Note that not all files, folders, and registry keys and entries are installed on your computer during this malware's/spyware's/grayware's execution. This may be due to incomplete installation or other operating system conditions. If you do not find the same files/folders/registry information, please proceed to the next step.

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
    • Fobber = "%Application Data%\Fobber\nemre.exe"
  • In HKEY_CURRENT_USER\Software\Microsoft\Internet Explorer\Main
    • TabProcGrowth = "1"

Step 5

Search and delete these files

[ Learn More ]
There may be some 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.
  • %Application Data%\Mozilla\Firefox\Profiles\{Profile folder}\user.js

Step 6

Reset Internet security settings

[ Learn More ]

Step 7

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