TSPY_URSNIF.MVIL
TrojanSpy:Win32/Ursnif.HS (Microsoft)
Windows
![](/vinfo/imgFiles/legend.jpg)
Threat Type: Spyware
Destructiveness: No
Encrypted: Yes
In the wild: Yes
OVERVIEW
Downloaded from the Internet, Dropped by other malware
This spyware arrives on a system as a file dropped by other malware or as a file downloaded unknowingly by users when visiting malicious sites.
It does not have any propagation routine.
It does not have any backdoor routine.
It connects to certain websites to send and receive information. However, as of this writing, the said sites are inaccessible.
TECHNICAL DETAILS
146,432 bytes
EXE
Yes
21 Dec 2016
Connects to URLs/IPs, Steals information
Arrival Details
This spyware 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 spyware drops and executes the following files:
- %User Temp%\{random folder name}\{random filename}.bat ← used to execute copy and delete itself
(Note: %User Temp% is the user's temporary folder, where it usually is C:\Documents and Settings\{user name}\Local Settings\Temp on Windows 2000, Windows Server 2003, and Windows XP (32- and 64-bit); C:\Users\{user name}\AppData\Local\Temp 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 copies of itself into the affected system:
- %Application Data%\{string1}{string2}\{string1}{string2}.exe
where:
{string1} = first four letters of a dll file under %System% directory
{string2} = last four letters of a dll file under %System% directory
(Note: %System% is the Windows system folder, where it usually is C:\Windows\System32 on all Windows operating system versions.)
It creates the following folders:
- %Application Data%\{string1}{string2}
where:
{string1} = first four letters of a dll file under %System% directory
{string2} = last four letters of a dll file under %System% directory
(Note: %System% is the Windows system folder, where it usually is C:\Windows\System32 on all Windows operating system versions.)
It injects codes into the following process(es):
- svchost.exe
It terminates the execution of the copy it initially executed and executes the copy it drops instead.
Autostart Technique
This spyware adds the following registry entries to enable its automatic execution at every system startup:
HKEY_CURRENT_USER\Software\Microsoft\
Windows\CurrentVersion\Run
Client32 = %Application Data%\{string1}{string2}\{string1}{string2}.{exe/dll}
Other System Modifications
This spyware adds the following registry keys:
HKEY_CURRENT_USER\Software\AppDataLow\
Software\Microsoft\{GUID}
HKEY_CURRENT_USER\Software\AppDataLow\
Software\Microsoft\{GUID}\
Vars
HKEY_CURRENT_USER\Software\AppDataLow\
Software\Microsoft\{GUID}\
Files
HKEY_CURRENT_USER\Software\AppDataLow\
Software\Microsoft\{GUID}\
Config
It adds the following registry entries:
HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\
Services\SharedAccess\Parameters\
FirewallPolicy\StandardProfile\AuthorizedApplications\
List
%System%\svchost.exe = "%System%\svchost.exe:*:Enabled:Windows Explorer"
HKEY_CURRENT_USER\Software\AppDataLow\
Software\Microsoft\{GUID}
{Value Name} = "{hex value}"
where {Value Name} may be any of the following:
- Client
- Install
Propagation
This spyware does not have any propagation routine.
Backdoor Routine
This spyware does not have any backdoor routine.
Dropping Routine
This spyware drops the following files wherein it saves the information it gathers:
- %User Temp%\{random filename}.bin
(Note: %User Temp% is the user's temporary folder, where it usually is C:\Documents and Settings\{user name}\Local Settings\Temp on Windows 2000, Windows Server 2003, and Windows XP (32- and 64-bit); C:\Users\{user name}\AppData\Local\Temp 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.)
Information Theft
This spyware gathers the following data:
- Computer Name
- Digital Certificates
- Cookies
- Keyboard Logs
- Clipboard Logs
- Captured Screenshot
- Email Credentials
- Running processes and services
- Installed device drivers
- Installed Programs
- Host Name
- OS Name, Version, Manufacturer
Stolen Information
This spyware sends the gathered information via HTTP POST to the following URL:
- http://{BLOCKED}leforth.ru/images/{random path}.{bmp} - inaccessible
Other Details
This spyware connects to the following website to send and receive information:
- http://{BLOCKED}leforth.ru/images/{random path}.{gif/jpeg}
It does the following:
- Save stolen information in a file and then upload it
- Monitor Internet browsing activities
- Hook APIs of target process
- Uninstall itself
- It terminates itself if it runs under a virtual machine or sandbox by checking the following strings against Plug and Play devices:
- vbox
- qemu
- vmware
- virtual hd
However, as of this writing, the said sites are inaccessible.
NOTES:
This spyware looks for %System Root%\321.txt. If found, it performs its routine in Developer's Mode.
It does not have rootkit capabilities.
It does not exploit any vulnerability.
SOLUTION
9.800
13.140.05
06 Jan 2017
13.141.00
07 Jan 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
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_CURRENT_USER\Software\AppDataLow\Software\Microsoft
- {GUID}
Step 5
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
- Client32 = %Application Data%\{string1}{string2}\{string1}{string2}.{exe/dll}
- Client32 = %Application Data%\{string1}{string2}\{string1}{string2}.{exe/dll}
- In HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\SharedAccess\Parameters\FirewallPolicy\StandardProfile\AuthorizedApplications\List
- %System%\svchost.exe = "%System%\svchost.exe:*:Enabled:Windows Explorer"
- %System%\svchost.exe = "%System%\svchost.exe:*:Enabled:Windows Explorer"
Step 6
Search and delete this file
- %User Temp%\{random filename}.bin
Step 7
Restart in normal mode and scan your computer with your Trend Micro product for files detected as TSPY_URSNIF.MVIL. 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.
Did this description help? Tell us how we did.