TSPY_URSNIF.K
TrojanSpy:Win32/Ursnif.gen!P(Microsoft), Win32/PSW.Papras.DS trojan(NOD32), Trojan-Spy.Win32.Ursnif (Ikarus)
Windows
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 connects to certain websites to send and receive information. It deletes itself after execution.
TECHNICAL DETAILS
338,219 bytes
EXE
Yes
12 Mar 2015
Steals information, Connects to URLs/IPs
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:
- %System%\{Random Filename}.exe
(Note: %System% is the Windows system folder, where it usually is C:\Windows\System32 on all Windows operating system versions.)
It adds the following mutexes to ensure that only one of its copies runs at any one time:
- Local\{GUID}
It injects codes into the following process(es):
- explorer.exe
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} = "%System%\{random file name}.exe"
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}"
Information Theft
This spyware gathers the following data:
- Digital Certificates
- Capture Screenshot
- Computer Name
- List Processes
- List Contents on this registry: HKLM\SOFTWARE\Microsoft\Windows\CurrentVersion\Uninstall\
- System Information
- Steal Cookies
- List Drivers
Other Details
This spyware connects to the following website to send and receive information:
- http://{BLOCKED}epport.su/zzz_img/flib/xxx/
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 performs a scan:
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Microsoft Antimalware\Exclusions\Paths %System%\{random file name}.exe = 0
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows Defender\Exclusions\Paths %System%\{random file name}.exe = 0
It terminates itself if found running under a virtual machine or sandbox by checking the following strings:
- vbox
- qemu
- vmware
- virtual hd
SOLUTION
9.750
11.536.04
12 Mar 2015
11.537.00
13 Mar 2015
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} = "%System%\{random file name}.exe"
- {random} = "%System%\{random file name}.exe"
- In HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Microsoft Antimalware\Exclusions\Paths
- %System%\{random file name}.exe = "0"
- %System%\{random file name}.exe = "0"
- In HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows Defender\Exclusions\Paths
- %System%\{random file name}.exe = "0"
- %System%\{random file name}.exe = "0"
Step 6
Restart in normal mode and scan your computer with your Trend Micro product for files detected as TSPY_URSNIF.K. 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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