RANSOM_TEARDROP.THBOFH
Trojan-Ransom.Win32.Blocker.kqwj (Kaspersky), Ransom.HiddenTear (Norton), Trojan:Win32/Occamy.B (Microsoft)
Windows
![](/vinfo/imgFiles/legend.jpg)
Threat Type: Ransomware
Destructiveness: No
Encrypted:
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.
TECHNICAL DETAILS
33,792 bytes
EXE
Yes
03 Feb 2018
Terminates processes, 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 copies of itself into the affected system and executes them:
- %Application Data%\Tear Dr0p.exe
(Note: %Application Data% is the Application Data folder, where it usually is C:\Documents and Settings\{user name}\Application Data on Windows 2000, Windows Server 2003, and Windows XP (32- and 64-bit); C:\Users\{user name}\AppData\Roaming on 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.)
It drops the following files:
- %Application Data%\vmBzz_s.log
(Note: %Application Data% is the Application Data folder, where it usually is C:\Documents and Settings\{user name}\Application Data on Windows 2000, Windows Server 2003, and Windows XP (32- and 64-bit); C:\Users\{user name}\AppData\Roaming on 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.)
Autostart Technique
This Ransomware adds the following registry entries to enable its automatic execution at every system startup:
HKEY_CURRENT_USER\Software\Microsoft\
Windows\CurrentVersion\Run
Tear Dr0p (cry more) = %Application Data%\Tear Dr0p.exe
Process Termination
This Ransomware terminates processes or services that contain any of the following strings if found running in the affected system's memory:
- KillSwitch
- taskmanger
- processhacker
- regedit
- cmd
- mbam
- malwarebytes_assistant
- mbamtray
- mbamwow
- MBAMWsc
- MSASCui
- capinfos
- dumpcap
- rawshark
Other Details
This Ransomware does the following:
- Displays the following windows:
Ransomware Routine
This Ransomware encrypts files with the following extensions:
- .htm
- .xhtml
- .html
- .phtml
- .vb
- .sql
- .java
- .cpp
- .c
- .svg
- .txt
- .png
- .gif
- .doc
- .docx
- .xls
- .jpg
- .mp3
- .ogg
- .mp4
- .xml
- .jpeg
- .zip
- .zipx
- .7z
- .rar
It appends the following extension to the file name of the encrypted files:
- .teardr0p
SOLUTION
9.850
13.952.03
30 Jan 2018
13.953.00
31 Jan 2018
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
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
- Tear Dr0p (cry more) = %Application Data%\Tear Dr0p.exe
- Tear Dr0p (cry more) = %Application Data%\Tear Dr0p.exe
Step 5
Search and delete these files
- %Application Data%\Tear Dr0p.exe
- %Application Data%\vmBzz_s.log
Step 6
Restart in normal mode and scan your computer with your Trend Micro product for files detected as RANSOM_TEARDROP.THBOFH. 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.
Step 8
Scan your computer with your Trend Micro product to delete files detected as RANSOM_TEARDROP.THBOFH. 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:
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