RANSOM_WCRY.THAOBFJ
Ransom:Win32/WannaCrypt.A!rsm (MICROSOFT); Trojan-Ransom.Win32.Wanna.m (KASPERSKY); Trojan.Ransom.WannaCryptor.H (BITDEFENDER)
Windows
Threat Type: Ransomware
Destructiveness: No
Encrypted: No
In the wild: Yes
OVERVIEW
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 executes the dropped file(s). As a result, malicious routines of the dropped files are exhibited on the affected system.
TECHNICAL DETAILS
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.
Autostart Technique
This Ransomware registers itself as a system service to ensure its automatic execution at every system startup by adding the following registry entries:
HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\
services\mssecsvc2.1
ImagePath = {initial malware file path} -m security
It adds and runs the following services:
- mssecsvc2.1
Dropping Routine
This Ransomware drops the following files:
- %Windows%\tasksche.exe
(Note: %Windows% is the Windows folder, where it usually is C:\Windows on all Windows operating system versions.)
It executes the dropped file. As a result, malicious routines of the dropped file are exhibited on the affected system.
Other Details
This Ransomware connects to the following possibly malicious URL:
- http://www.{BLOCKED}sodp9ifjaposdfjhgosurijfaewrwergwff.com
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
Restart in Safe Mode
Step 4
Disable this malware service
- Service Name: mssecsvc2.1
Step 5
Delete this registry key
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_LOCAL_MACHINE\SYSTEM\CurrentControlSet\services\mssecsvc2.1
- ImagePath = {initial malware file path} -m security
- ImagePath = {initial malware file path} -m security
Step 6
Search and delete this file
- %Windows%\tasksche.exe
Step 7
Restart in normal mode and scan your computer with your Trend Micro product for files detected as RANSOM_WCRY.THAOBFJ. 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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