RANSOM_STUPETRI.A
Windows
Threat Type: Ransomware
Destructiveness: No
Encrypted: No
In the wild: Yes
OVERVIEW
Dropped by other malware, Downloaded from the Internet
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 with specific file extensions. It encrypts files found in specific folders.
TECHNICAL DETAILS
71,168 bytes
EXE
No
24 May 2017
Connects to URLs/IPs, Displays message/message boxes, Encrypts files
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 files:
- %Desktop%\{Random Value}.4rncry4w
- %Desktop%\{Random Value}3a.4rnkey
- %User Profile%\Pictures\{Random Value}.4rncry4w
- %User Profile%\Pictures\{Random Value}5d.4rnkey
- %User Profile%\Documents\{Random Value}.4rncry4w
- %User Profile%\Documents\{Random Value}t6.4rnkey
- %Path to Malware%\4rw5wDecryptor.exe
- %User Startup%\4rw5wDecryptor.exe
(Note: %Desktop% is the desktop folder, where it usually is C:\Documents and Settings\{user name}\Desktop in Windows 2000, Windows Server 2003, and Windows XP (32- and 64-bit); C:\Users\{user name}\Desktop in Windows Vista (32- and 64-bit), Windows 7 (32- and 64-bit), Windows 8 (32- and 64-bit), Windows 8.1 (32- and 64-bit), Windows Server 2008, and Windows Server 2012.. %User Profile% is the current user's profile folder, which is usually C:\Documents and Settings\{user name} on Windows 2000, XP, and Server 2003, or C:\Users\{user name} on Windows Vista and 7.. %User Startup% is the current user's Startup folder, which is usually C:\Documents and Settings\{user}\Start Menu\Programs\Startup on Windows 2000 and XP, and C:\Documents and Settings\{User name}\Start Menu\Programs\Startup on Windows Vista, 7, and 8.)
Other Details
This Ransomware does the following:
Displays a fake error message:
- Pings www.{BLOCKED}t6f090z5f5hf5h.com, terminates itself if successful
Displays the following window as ransom note:
Ransomware Routine
This Ransomware encrypts files with the following extensions:
- .jpg
- .png
- .txt
- .NEF
- .exe
- .DOC
- .DOCX
- .DOT
- .DOTM
- .ODT
- .lnk
- .url
- .pif
- .dll
- .wav
- .avi
- .mp3
- .rar
- .zip
It encrypts files found in the following folders:
- Desktop
- MyPictures
- Personal
It appends the following extension to the file name of the encrypted files:
- .4rwcry4w
SOLUTION
9.850
13.428.01
24 May 2017
13.429.00
25 May 2017
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
- %Desktop%\{Random Value}.4rncry4w
- %Desktop%\{Random Value}3a.4rnkey
- %User Profile%\Pictures\{Random Value}.4rncry4w
- %User Profile%\Pictures\{Random Value}5d.4rnkey
- %User Profile%\Documents\{Random Value}.4rncry4w
- %User Profile%\Documents\{Random Value}t6.4rnkey
- %Path to Malware%\4rw5wDecryptor.exe
- %User Startup%\4rw5wDecryptor.exe
Step 4
Scan your computer with your Trend Micro product to delete files detected as RANSOM_STUPETRI.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.
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