RANSOM_UYARITEAR.A
Ransom:MSIL/Ryzerlo.A (Microsoft); MSIL/Filecoder.Y!tr (Fortinet)
Windows
Threat Type: Trojan
Destructiveness: No
Encrypted: No
In the wild: Yes
OVERVIEW
This Trojan 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 arrives on a system as a file dropped by other malware or as a file downloaded unknowingly by users when visiting malicious sites.
Autostart Technique
This Trojan adds the following registry entries to enable its automatic execution at every system startup:
HKEY_CURRENT_USER\SOFTWARE\Microsoft\
Windows\CurrentVersion\Run
WindowsServiceEngine = {malware path and filename}
Other System Modifications
This Trojan modifies the following file(s):
- It encrypts files and appends the extension .locked
Other Details
This Trojan encrypts files with the following extensions:
- .txt
- .rar
- .jpeg
- .jpg
- .sql
- .png
- .accdb
- .xls
- .xlsx
- .doc
- .docx
- .ppt
- .pptx
- .zip
- .gz
- .tar
- .tib
- .tmp
- .frm
- .dwg
- .pst
- .psd
- .ai
- .svg
- .gif
- .bak
- .db
It drops the following file(s)/component(s):
- %Desktop%\DOSYALARINIZA ULAŞMAK İÇİN AÇINIZ.html - Ransom Note
- %User Profile%\.windowsServiceEngine
(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.)
NOTES:
This ransomware drops the following ransom note:
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
Delete this registry value
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.
- In HKEY_CURRENT_USER\SOFTWARE\Microsoft\Windows\CurrentVersion\Run
- WindowsServiceEngine = {malware path and filename}
- WindowsServiceEngine = {malware path and filename}
Step 4
Search and delete these files
- %Desktop%\DOSYALARINIZA ULAŞMAK İÇİN AÇINIZ.html
- %User Profile%\.windowsServiceEngine
Step 5
Scan your computer with your Trend Micro product to delete files detected as RANSOM_UYARITEAR.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 6
Restore encrypted files from backup.
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