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TROJ_GATAK.FER

June 27, 2015
 PLATFORM:

Windows

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

  • Threat Type: Trojan

  • Destructiveness: No

  • Encrypted:

  • In the wild: Yes

  OVERVIEW

Infection Channel:

Downloaded from the Internet

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.

It connects to certain websites to send and receive information. It deletes itself after execution.

  TECHNICAL DETAILS

File Size:

561,152 bytes

File Type:

EXE

Memory Resident:

No

Initial Samples Received Date:

25 Jun 2015

Payload:

Connects to URLs/IPs, Downloads files

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 drops the following files:

  • %User Temp%\~{random digits}.tmp - contains system information

(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 injects codes into the following process(es):

  • explorer.exe

Other System Modifications

This Trojan adds the following registry keys:

HKEY_CURRENT_USER\Software\Microsoft\
EventSubsystem

Download Routine

This Trojan accesses the following websites to download files:

  • http://{BLOCKED}enpost.org/uploads/867534d498edf2d8154c81112dfaf2ee.png

Information Theft

This Trojan gathers the following data:

  • OS Version
  • Computer Name
  • Host Name
  • Running process

Other Details

This Trojan connects to the following website to send and receive information:

  • http://{BLOCKED}ltportugal.co.uk/report_N_0025_{hex value}_{report status}

It deletes itself after execution.

NOTES:
Where {report status} can be any of the following:

  • watch2_err_1
  • image_size_ok
  • image_type_ok
  • gdiplus_not_ok
  • gdiplus_ok
  • image_ok
  • crc_ok
  • image_not_ok
  • image_type_not_ok
  • image_size_not_ok
  • page_ok
  • payload_ok
  • payload_size_ok
  • payload_type_bad
  • payload_type_exe_wait_del
  • payload_file_name_ok
  • payload_file_write_ok
  • payload_file_run_ok
  • payload_file_wait_ok
  • payload_file_delete_ok
  • payload_type_exe
  • payload_type_shell
  • payload_mem_ok
  • payload_executed
  • payload_mem_not_ok
  • payload_no_ok
  • page_err
  • step_2
  • step_3
  • executed_ok
  • mark_setted
  • mark_not_setted
  • process_
  • except
  • except_detail_
  • step_0
  • step_1
  • already_ok
  • mark_ok
  • step_4
  • started_ext_
  • mark_already
  • already_active
  • finished

This malware will terminate itself if any of the following processes is present in the system:

  • PEiD.exe
  • aswVBoxClient.exe
  • SandboxieDcomLaunch.exe

This malware relies on steganography to evade detection. It connects to specific URLs to download a stock image, where majority of its routines are embedded. It then extracts the following from the downloaded image:

  • Arbitrary code
  • List of URLs to be accessed

  SOLUTION

Minimum Scan Engine:

9.750

FIRST VSAPI PATTERN FILE:

11.722.04

FIRST VSAPI PATTERN DATE:

10 Jun 2015

VSAPI OPR PATTERN File:

11.723.00

VSAPI OPR PATTERN Date:

11 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 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
    • EventSubsystem

Step 5

Search and delete this file

[ 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.
  • %User Temp%\~{random digits}.tmp

Step 6

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