RANSOM_CRYPTBTN.A
Windows
![](/vinfo/imgFiles/legend.jpg)
Threat Type: Trojan
Destructiveness: No
Encrypted: No
In the wild: Yes
OVERVIEW
This Trojan may arrive bundled with malware packages as a malware component. It arrives on a system as a file dropped by other malware or as a file downloaded unknowingly by users when visiting malicious sites.
TECHNICAL DETAILS
Arrival Details
This Trojan may arrive bundled with malware packages as a malware component.
It arrives on a system as a file dropped by other malware or as a file downloaded unknowingly by users when visiting malicious sites.
Other System Modifications
This Trojan creates the following registry key/entry to trick users into thinking that it is a legitimate application:
HKEY_CURRENT_USER\Software\Microsoft\
Direct3D\MostRecentApplication
Name = "{malware path}"
Dropping Routine
This Trojan drops the following files:
- C:\Program Files\Windows Defender\hosts.locked
Other Details
This Trojan does the following:
- Searches for the files with the following extensions in all drives:
- .doc
- .xls
- .ppt
- .txt
- .bmp
- .jpg
- .gif
- .jpeg
- .mpeg
- .avi
- .zip
- .rar
- .accdb
- .db
- .mdb
- .bak
NOTES:
This ransomware displays the following as ransom note:
It directs to the following URL when the "Buy BitCoin" button was clicked:
- https://www.youtube.com/watch?v={BLOCKED}J3Q9g
- https://www.{BLOCKED}e.com/en
This ransomware doesn't have the capability of encrypting files but has the intention of encrypting files and use it for ransom.
It may be used as a component of other malwares.
SOLUTION
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
Search and delete this file
- C:\Program Files\Windows Defender\hosts.locked
Step 4
Scan your computer with your Trend Micro product to delete files detected as RANSOM_CRYPTBTN.A. 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.
Step 5
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.
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