Trojan.BAT.BANLOAD.THBAIAI
HEUR:Trojan.BAT.Generic (Kaspersky), Trojan.Obfus.BAT.3.Gen (BitDefender)
Windows
Threat Type: Trojan
Destructiveness: No
Encrypted: No
In the wild: Yes
OVERVIEW
Downloaded from the Internet, Dropped by other malware
This fileless malware connects to specific URLs to download PowerShell codes and execute these.
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 saves downloaded files into the said created folder.
TECHNICAL DETAILS
627 bytes
BAT
No
19 Feb 2019
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 creates the following folders:
- %Public%\Java_{6 random character}{1 random number}_
(Note: %Public% is the folder that serves as a repository of files or folders common to all users, which is usually C:\Users\Public in Windows Vista, 7, and 8.)
Download Routine
This Trojan connects to the following website(s) to download and execute a malicious file:
- http://{BLOCKED}.{BLOCKED}.52.26/loads/20938092830482 ← Powershell codes that will connect to other websites to download, extract and rename.
- http://{BLOCKED}.{BLOCKED}.52.26/mods/al/md.zip ← downloaded of Powershell codes
It saves the files it downloads using the following names:
- %Public%\Java_{6 random character}{1 random number}_\ex.png ← detected as Trojan.JS.BANKER.THBAIAI
- %Public%\Java_{6 random character}{1 random number}_\Java_{6 random character}{1 random number}_.exe ← Autoit Sctipt Compiler
- %Public%\Java_{6 random character}{1 random number}_\Java_{6 random character}{1 random number}_.LNS ← detected as TrojanSpy.Win32.BANRAP.AS
- %Public%\Java_{6 random character}{1 random number}_\Java_{6 random character}{1 random number}_1.LNS ← Autoit script
- %Public%\Java_{6 random character}{1 random number}_\libeay32.dll ← normal file
- %Public%\Java_{6 random character}{1 random number}_\sqlite3.dll ← normal file
- %Public%\Java_{6 random character}{1 random number}_\ssleay32.dll ← normal file
- %Public%\i.dat ← where it saves its string used for files and folder name.
- %Public%\c.lnk ← Target: Autoit compiler and autoit script
- %User Startup%\ Java__{6 random character}{1 random number}_.lnk ← Target: Autoit script compiler and autoit script
It saves downloaded files into the said created folder.
Other Details
This Trojan does the following:
- It executes the following command to restart the affected machine:
- shutdown -r -t 200
SOLUTION
9.850
14.824.03
19 Feb 2019
14.825.00
20 Feb 2019
Step 1
Before doing any scans, Windows 7, Windows 8, Windows 8.1, and Windows 10 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
Identify and terminate files detected as Trojan.BAT.BANLOAD.THBAIAI
- 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 4
Search and delete these folders
- %Public%\Java_{6 random character}{1 random number}_
- %Public%\i.dat
- %Public%\c.lnk
- %User Startup%\ Java__{6 random character}{1 random number}_.lnk
Step 5
Scan your computer with your Trend Micro product to delete files detected as Trojan.BAT.BANLOAD.THBAIAI. 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 the following Trend Micro Support pages for more information:
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