Ransom.MSIL.ROBTOR.THLADBC
HEUR:Trojan-Ransom.MSIL.Encoder.gen(KASPERSKY)
Windows
Threat Type: Ransomware
Destructiveness: No
Encrypted:
In the wild: Yes
OVERVIEW
Downloaded from the Internet, Dropped by other malware
This Ransomware arrives on a system as a file dropped by other malware or as a file downloaded unknowingly by users when visiting malicious sites.
It encrypts files found in specific folders. It drops files as ransom note.
TECHNICAL DETAILS
20,992 bytes
EXE
Yes
14 Dec 2023
Connects to URLs/IPs, Drops files, Encrypts files, Steals information, Collects system information
Arrival Details
This Ransomware 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 Ransomware adds the following processes:
- cmd.exe /c taskkill /IM {Malware Name} /F && del \ {Malware File Path}
- Notepad.exe "%Desktop%\RobCryptor.txt"
(Note: %Desktop% is the current user's desktop, which is usually C:\Documents and Settings\{User Name}\Desktop on Windows 2000(32-bit), XP, and Server 2003(32-bit), or C:\Users\{user name}\Desktop on Windows Vista, 7, 8, 8.1, 2008(64-bit), 2012(64-bit) and 10(64-bit).)
Autostart Technique
This Ransomware drops the following files:
- {Removable Drive}:\autorun.inf
Propagation
This Ransomware drops the following copy(ies) of itself in all removable drives:
- {Removable Drive}:\RobCryptor.exe → Copy of itself
Information Theft
This Ransomware gathers the following data:
- IP Address
- Username
- If Machine is 64-bit
- Total RAM
- Available Memory
- OS Version
- Lists of Disks
- OS Build
- Registered Owner
Stolen Information
This Ransomware sends the gathered information via HTTP POST to the following URL:
- https://{BLOCKED}d.com/api/webhooks/874832445508300811/_sh8CNQu_kjOYMptw-3i8n1wXSvRHgeULe04wHSodhpCd5o_LFoTugCEkUYE-uC0PuIX
Other Details
This Ransomware does the following:
- It terminates itself if any of the following are satisfied
- If the MD5 Hashed username matches the following hash:
- d199ae63b2b2e6c7bd8229faf10821e4 → ezzal
- If the following strings are found on the system information:
- VIRTUAL
- vmware
- VirtualBox
- It displays its ransom note after encryption
It checks if the following virtual machine or sandbox related module(s) is loaded in the affected system:
- sbieDll.dll
Ransomware Routine
This Ransomware encrypts files found in the following folders:
- %Desktop%
- %User Profile%\My Documents
- %User Profile%\My Pictures
(Note: %Desktop% is the current user's desktop, which is usually C:\Documents and Settings\{User Name}\Desktop on Windows 2000(32-bit), XP, and Server 2003(32-bit), or C:\Users\{user name}\Desktop on Windows Vista, 7, 8, 8.1, 2008(64-bit), 2012(64-bit) and 10(64-bit).. %User Profile% is the current user's profile folder, which is usually C:\Documents and Settings\{user name} on Windows 2000(32-bit), XP, and Server 2003(32-bit), or C:\Users\{user name} on Windows Vista, 7, 8, 8.1, 2008(64-bit), 2012(64-bit) and 10(64-bit).)
It appends the following extension to the file name of the encrypted files:
- .RobCryptor
It drops the following file(s) as ransom note:
- %Desktop%\RobCryptor.txt
SOLUTION
9.800
18.878.03
14 Dec 2023
18.879.00
15 Dec 2023
Step 1
Trend Micro Predictive Machine Learning detects and blocks malware at the first sign of its existence, before it executes on your system. When enabled, your Trend Micro product detects this malware under the following machine learning name:
- TROJ.Win32.TRX.XXPE50FFF075
Step 2
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 3
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 4
Search and delete this file
- {Removable Drive}:\autorun.inf
- {Removable Drive}:\RobCryptor.exe
Step 5
Scan your computer with your Trend Micro product to delete files detected as Ransom.MSIL.ROBTOR.THLADBC. 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.