RANSOM_HIDDENTEARNULL.A
MSIL.Trojan-Ransom.NullRansom.A (GData); Trojan.Ransom.HiddenTear (A) (Emsisoft)
Windows
![](/vinfo/imgFiles/legend.jpg)
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 is capable of encrypting files in the affected system.
TECHNICAL DETAILS
691,712 bytes
EXE
Yes
15 Aug 2017
Drops files, 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%\{Malware Filename}
(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 modifies the following registry entry(ies) to enable its automatic execution at every system startup:
HKLM\SOFTWARE\Microsoft\
Windows\CurrentVersion\Run
winScreenFilter = "%Application Data%\{Malware Filename}"
Other Details
This Ransomware renames encrypted files using the following names:
- {original filename.extension}.null
It is capable of encrypting files in the affected system.
Ransomware Routine
This Ransomware avoids encrypting files with the following strings in their file path:
- WINDOWS
NOTES:
It displays the following window applications as ransom note:
SOLUTION
9.850
13.596.07
15 Aug 2017
13.597.00
16 Aug 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
Restart in Safe Mode
Step 4
Restore this modified 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\CurrentVersion\Run
- winScreenFilter = "%Application Data%\{Malware Filename}"
- winScreenFilter = "%Application Data%\{Malware Filename}"
Step 5
Restart in normal mode and scan your computer with your Trend Micro product for files detected as RANSOM_HIDDENTEARNULL.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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