Ransom.MSIL.TRYTOCRY.THGOABQ

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 drops files as ransom note.

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 drops the following copies of itself into the affected system:

• %User Temp%\explorer.exe

(Note: %User Temp% is the current user's Temp folder, which is usually C:\Documents and Settings\{user name}\Local Settings\Temp on Windows 2000(32-bit), XP, and Server 2003(32-bit), or C:\Users\{user name}\AppData\Local\Temp on Windows Vista, 7, 8, 8.1, 2008(64-bit), 2012(64-bit) and 10(64-bit).)

Autostart Technique

This Ransomware adds the following registry entries to enable its automatic execution at every system startup:

HKEY_CURRENT_USER\Software\Microsoft\
Windows\CurrentVersion\Run
Microsoft = %User Temp%\explorer.exe

It drops the following file(s) in the Startup Items folder to enable its automatic execution at every system startup:

• %User Startup%\explorer.exe

(Note: %User Startup% is the current user's Startup folder, which is usually C:\Windows\Profiles\{user name}\Start Menu\Programs\Startup on Windows 98 and ME, C:\WINNT\Profiles\{user name}\Start Menu\Programs\Startup on Windows NT, C:\Documents and Settings\{User name}\Start Menu\Programs\Startup on Windows 2003(32-bit), XP and 2000(32-bit), or C:\Users\{user name}\AppData\Roaming\Microsoft\Windows\Start Menu\Programs\Startup on Windows Vista, 7, 8, 8.1, 2008(64-bit), 2012(64-bit), 10(64-bit).)

Propagation

This Ransomware drops the following copy(ies) of itself in all removable drives:

• الاصول الخمسه.exe
• خاص جدا.exe
• غريب.exe
• كلمات المرور.exe
• هام.exe
• Update.exe

Other Details

This Ransomware encrypts files with the following extensions:

• .doc
• .ppt
• .jpg
• .xls
• .pdf
• .docx
• .pptx
• .xlsx
• .mdb
• .accdb
• .sln
• .vb
• .aspx
• .cs
• .fmx
• .fmb
• .txt
• .zip
• .rar

It does the following:

• Has specific conditions before proceeding with its ransomware routine:
  • Avoids encryption if the machine name is one of the following:
  • DESKTOP-{BLOCKED}4
  • {BLOCKED}2
  • Date must be October 11, 2020 or later
• It creates shortcut files (.LNK) disguised as folders or files located on the affected drives pointing to the malware copy and the file it is disguised as.

Ransomware Routine

This Ransomware appends the following extension to the file name of the encrypted files:

• .Try2Cry

It drops the following file(s) as ransom note:

• {Encrypted File Path}\{Name of Encrypted File}.html
• 
• {Encrypted File Path}\{Name of Encrypted File}.txt - Empty text file
• {Encrypted File Path}\{Name of Encrypted File}.bmp
•