Ransom.Win32.MISSING.THKBBBC
Trojan-Ransom.Win32.Kangar.a (KASPERSKY)
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 then deletes itself afterward.
It drops files as ransom note.
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.
Installation
This Ransomware drops a copy of itself in the following folders using different file names:
- %Program Files%\Windows NT\explorer.exe
(Note: %Program Files% is the default Program Files folder, usually C:\Program Files in Windows 2000(32-bit), Server 2003(32-bit), XP, Vista(64-bit), 7, 8, 8.1, 2008(64-bit), 2012(64-bit) and 10(64-bit) , or C:\Program Files (x86) in Windows XP(64-bit), Vista(64-bit), 7(64-bit), 8(64-bit), 8.1(64-bit), 2008(64-bit), 2012(64-bit) and 10(64-bit).)
It adds the following processes:
- %System%\wbem\wmic.exe process call create "cmd.exe /c vssadmin delete shadows /all /quiet"
- %System%\WerFault.exe -u -p 7680 -s 280
(Note: %System% is the Windows system folder, where it usually is C:\Windows\System32 on all Windows operating system versions.)
It executes then deletes itself afterward.
It adds the following mutexes to ensure that only one of its copies runs at any one time:
- Local\Kangaroo_Ransomware
It terminates the execution of the copy it initially executed and executes the copy it drops instead.
Other System Modifications
This Ransomware adds the following registry entries:
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows NT\CurrentVersion\Winlogon
LegalNoticeCaption = Attention!
Other Details
This Ransomware does the following:
- It generates unique ID based on the Computer Name, Username, and system default locale name of the affected system.
- It displays the following GUI:
Ransomware Routine
This Ransomware appends the following extension to the file name of the encrypted files:
- .missing
It drops the following file(s) as ransom note:
- {Encrypted Directory}\{Encrypted File}.Contact_Data_Recovery.txt
SOLUTION
Step 1
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 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_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Winlogon
- LegalNoticeCaption = Attention!
- LegalNoticeCaption = Attention!
Step 4
Search and delete this file
- %Program Files%\Windows NT\explorer.exe
- {Encrypted Directory}\{Encrypted File}.Contact_Data_Recovery.txt
Step 5
Scan your computer with your Trend Micro product to delete files detected as Ransom.Win32.MISSING.THKBBBC. 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 the following Trend Micro Support pages for more information:
Step 6
Restore encrypted files from backup.
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