TROJ_GATAK.FER
Windows
Threat Type: Trojan
Destructiveness: No
Encrypted:
In the wild: Yes
OVERVIEW
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
561,152 bytes
EXE
No
25 Jun 2015
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
9.750
11.722.04
10 Jun 2015
11.723.00
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
Step 4
Delete this registry key
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
- EventSubsystem
Step 5
Search and delete this file
- %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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