Ransom.MSIL.WANNASCREAM.A
Trojan:MSIL/Filecoder.DSK!MTB (Microsoft); Trojan.Filecoder (Quickheal); Trojan-Ransom.FileCrypter (Ikarus)
Windows
![](/vinfo/imgFiles/legend.jpg)
Threat Type: Ransomware
Destructiveness: No
Encrypted: No
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 steals certain information from the system and/or the user.
It connects to certain websites to send and receive information.
It drops files as ransom note.
TECHNICAL DETAILS
28,672 bytes
EXE
Yes
19 Feb 2020
Drops files, Steals information, Connects to URLs/IPs
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 Startup%\Runtime Broker.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).)
It adds the following processes:
- "cmd.exe /c vssadmin.exe delete shadows /all /quiet"
Information Theft
This Ransomware steals the following information:
- Operating System
- CPU information
- Public IP Address
- Total Size of All Logical Drives
- Machine Name
- Volume Serial Number
- Processor ID
Other Details
This Ransomware connects to the following website to send and receive information:
- http://recoverydata.{BLOCKED}sting.com/db
Ransomware Routine
This Ransomware avoids encrypting files with the following strings in their file name:
- info.txt
It avoids encrypting files with the following strings in their file path:
- C:\Windows
- A:\
- C:\Boot
- boot
- swapfile.sys
- pagefile.sys
- hiberfil.sys
- BOOTNXT
- boot.sdi
- bootmgr
- BOOTSECT.BAK
It appends the following extension to the file name of the encrypted files:
- -id.[{generated ID from Volume Serial Number or Processor iD}].Email=[{BLOCKED}tharma24@cock.li].Harma
It drops the following file(s) as ransom note:
- {infected folder}\info.txt
- %User Startup%\WannaScream.hta
SOLUTION
9.850
15.694.04
19 Feb 2020
15.695.00
20 Feb 2020
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.XXPE50FFF033
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
Restart in Safe Mode
Step 5
Search and delete these files
- %User Startup%\WannaScream.hta
Step 6
Restart in normal mode and scan your computer with your Trend Micro product for files detected as Ransom.MSIL.WANNASCREAM.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 7
Restore encrypted files from backup.
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