RANSOM_SALSA.A
Windows
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 executes the downloaded files. As a result, malicious routines of the downloaded files are exhibited on the affected system.
It deletes the initially executed copy of itself.
TECHNICAL DETAILS
357,376 bytes
EXE
No
01 Apr 2017
Connects to URLs/IPs
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 file(s)/component(s):
- {malware path}\master.dll
- {malware path}\dump.dll
- {malware path}\2.data
- {malware path}\0.data
- {malware path}\msvcp140.dll - non-malicious file
- {malware path}\vcruntime140.dll - non-malicious file
- {malware path}\concrt140.dll - non-malicious file
- {malware path}\vccorlib140.dll - non-malicious file
- %User Profile%\{random characters}\master.dll
- %User Profile%\{random characters}\dump.dll
- %User Profile%\{random characters}\2.data
- %User Profile%\{random characters}\0.data
- %User Profile%\{random characters}\msvcp140.dll - non-malicious file
- %User Profile%\{random characters}\vcruntime140.dll - non-malicious file
- %User Profile%\{random characters} \concrt140.dll - non-malicious file
- %User Profile%\{random characters}\vccorlib140.dll - non-malicious file
- %User Profile%\{random characters}\{random characters}.exe
(Note: %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.)
It creates the following folders:
- %User Profile%\{random characters} - two folders
(Note: %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.)
Autostart Technique
This Ransomware adds the following registry entries to enable its automatic execution at every system startup:
HKCU\Software\Microsoft\
Windows\CurrentVersion\RunOnce
{random characters} = %User Profile%\{random name}.exe {random numbers} {random characters}
HKCU\Software\Microsoft\
Windows\CurrentVersion\Run
{random characters} = %User Profile%\{random name}.exe {random characters}
Download Routine
This Ransomware connects to the following URL(s) to download its component file(s):
- http://{BLOCKED}here1948.biz/
It saves the files it downloads using the following names:
- {malware path}\msvcp140.dll - non-malicious file
- {malware path}\vccorlib140.dll - non-malicious file
- {malware path}\vcruntime140.dll - non-malicious file
- {malware path}\concrt140.dll - non-malicious file
- %User Profile%\{random name}.exe
(Note: %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.)
It then executes the downloaded files. As a result, malicious routines of the downloaded files are exhibited on the affected system.
Other Details
This Ransomware requires the following additional components to properly run:
- msvcp140.dll - non-malicious file, Microsoft Visual 2015 C++ Redistributable DLL
- vcruntime140.dll - non-malicious file, Microsoft Visual 2015 C++ Redistributable DLL
- concrt140.dll - non-malicious file, Microsoft Visual 2015 C++ Redistributable DLL
- vccorlib140.dll - non-malicious file, Microsoft Visual 2015 C++ Redistributable DLL
It deletes the initially executed copy of itself
SOLUTION
9.850
13.316.08
03 Apr 2017
13.317.00
04 Apr 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
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\RunOnce
- {random characters} = %User Profile%\{random name}.exe {random numbers} {random characters}
- {random characters} = %User Profile%\{random name}.exe {random numbers} {random characters}
- In HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Run
- {random characters} = %User Profile%\{random name}.exe {random characters}
- {random characters} = %User Profile%\{random name}.exe {random characters}
Step 4
Search and delete this file
- {malware path}\master.dll
- {malware path}\dump.dll
- {malware path}\2.data
- {malware path}\0.data
- {malware path}\msvcp140.dll
- {malware path}\vcruntime140.dll
- {malware path}\concrt140.dll
- {malware path}\vccorlib140.dll
- %User Profile%\{random characters}\master.dll
- %User Profile%\{random characters}\dump.dll
- %User Profile%\{random characters}\2.data
- %User Profile%\{random characters}\0.data
- %User Profile%\{random characters}\msvcp140.dll
- %User Profile%\{random characters}\vcruntime140.dll
- %User Profile%\{random characters} \concrt140.dll
- %User Profile%\{random characters}\vccorlib140.dll
- %User Profile%\{random characters}\{random characters}.exe
Step 5
Search and delete these folders
- %User Profile%\{random characters}
Step 6
Scan your computer with your Trend Micro product to delete files detected as RANSOM_SALSA.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.
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