TSPY_URSNIF.XXRB
TrojanSpy:Win32/Ursnif (Microsoft); Win32/PSW.Papras.DS (ESET-NOD32); W32/Backdoor2.HYRW (F-Prot); W32/Papras.DS!tr.pws (Fortinet); RDN/Generic PWS.y!bdp (McAfee)
Windows
Threat Type: Spyware
Destructiveness: No
Encrypted:
In the wild: Yes
OVERVIEW
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 deletes itself after execution.
TECHNICAL DETAILS
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 the following copies of itself into the affected system and executes them:
- %User Temp%\{string1 + string2}.exe (for Windows Vista and above)
where:- {string1} = first four letters of a dll file under %System% directory
- {string2} = last four letters of a dll file under %System% directory
- (e.g. ciadt500.exe = ciadmin.dll + jet500.dll)
- %System%\{string1 + string2}.exe (for Windows XP and below)
(Note: %System% is the Windows system folder, where it usually is C:\Windows\System32 on all Windows operating system versions.)
It drops and executes the following files:
- %User Temp%\{Random Filename}.bat - batch file to delete the executed copy
(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.)
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
{random} = "%User Temp%\{string1 + string2}.exe" (for Windows Vista and above)
HKEY_CURRENT_USER\Software\Microsoft\
Windows\CurrentVersion\Run
{random} = "%System%\{string1 + string2}.exe" (for Windows XP and below)
Other System Modifications
This spyware adds the following registry keys:
HKEY_CURRENT_USER\Software\AppDataLow\
{GUID}
It adds the following registry entries:
HKEY_CURRENT_USER\Software\AppDataLow\
{GUID}
Install = "{hex value}"
HKEY_CURRENT_USER\Software\AppDataLow\
{GUID}
Client = "{hex value}"
Other Details
This spyware connects to the following possibly malicious URL:
- http://{BLOCKED}ecarsdaysforum.xyz/geodata/version/ip2ext
- http://{BLOCKED}steelsforums.xyz/geodata/version/ip2ext
- http://{BLOCKED}ersbrenderns.com/geodata/version/ip2ext
- http://{BLOCKED}systemsbreds.com/geodata/version/ip2ext
It deletes itself after execution.
NOTES:
It locates the following registries:
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Microsoft Antimalware\Exclusions\Paths
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows Defender\Exclusions\Paths
If found, it adds the following registry value to exclude its dropped copy everytime an antivirus software performs a scan:
- HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Microsoft Antimalware\Exclusions\Paths
- %System%\{string1 + string2}.exe = 0 (for Windows XP and below)
- %User Temp%\{string1 + string2}.exe = 0 (for Windows Vista and above)
- HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows Defender\Exclusions\Paths
- HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Microsoft Antimalware\Exclusions\Paths
- %System%\{string1 + string2}.exe = 0 (for Windows XP and below)
- %User Temp%\{string1 + string2}.exe = 0 (for Windows Vista and above)
It deletes the Zone.Identifier NTFS stream to remove the downloaded files history.
SOLUTION
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
- {GUID}
- {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
- {random} = "{%User Temp% or %System%}\{string1 + string2}.exe"
- {random} = "{%User Temp% or %System%}\{string1 + string2}.exe"
- In HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Microsoft Antimalware\Exclusions\Paths
- %System%\{string1 + string2}.exe = "0" (for Windows XP and below)
- %System%\{string1 + string2}.exe = "0" (for Windows XP and below)
- In HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Microsoft Antimalware\Exclusions\Paths
- %User Temp%\{string1 + string2}.exe = "0" (for Windows Vista and above)
- %User Temp%\{string1 + string2}.exe = "0" (for Windows Vista and above)
- In HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows Defender\Exclusions\Paths
- %System%\{string1 + string2}.exe = "0" (for Windows XP and below)
- %System%\{string1 + string2}.exe = "0" (for Windows XP and below)
- In HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows Defender\Exclusions\Paths
- %User Temp%\{string1 + string2}.exe = "0" (for Windows Vista and above)
- %User Temp%\{string1 + string2}.exe = "0" (for Windows Vista and above)
Step 6
Search and delete this file
- %User Temp%\{Random Filename}.bat
Step 7
Restart in normal mode and scan your computer with your Trend Micro product for files detected as TSPY_URSNIF.XXRB. 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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