TSPY_URSNIF.YHN
TrojanSpy:Win32/Ursnif.HP (Microsoft); Troj/Gozi-AQ (Sophos); Trojan.Win32.Scar.mwhi (Kaspersky);
Windows
![](/vinfo/imgFiles/legend.jpg)
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.
TECHNICAL DETAILS
360,448 bytes
EXE
Yes
25 Jan 2016
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 files:
- %User Temp%\{random folder name}\{random filename}.bat ← use to delete itself; deleted afterwards
- %Application Data%\{8 character string}\{8 character string}.exe ← copy of 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.. %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 spyware adds the following registry entries to enable its automatic execution at every system startup:
HKEY_CURRENT_USER\Software\Microsoft\
Windows\CurrentVersion\Run
{8 character string} = "%Application Data%\{8 character string}\{8 character string}.exe"
Other System Modifications
This spyware adds the following registry keys:
HKEY_CURRENT_USER\Software\AppDataLow\
Software\Microsoft\{GUID}
It adds the following registry entries:
HKEY_CURRENT_USER\Software\AppDataLow\
Software\Microsoft\{GUID}
Install = "{hex value}"
HKEY_CURRENT_USER\Software\AppDataLow\
Software\Microsoft\{GUID}
Client = "{hex value}"
HKEY_CURRENT_USER\Software\AppDataLow\
Software\Microsoft\{GUID}
{GUID} = "{hex value}"
Other Details
This spyware connects to the following possibly malicious URL:
- http://{BLOCKED}ex.com/images/%7brandom path}.{gif/bmp}
- http://{BLOCKED}freh.com/images/{random path}.{gif/bmp}
- http://{BLOCKED}frejfretergtht.com/images/{random path}.{gif/bmp}
- http://{BLOCKED}ak.com/images/{random path}.{gif/bmp}
- http://{BLOCKED}rehrehw.com/images/{random path}.{gif/bmp}
- http://{BLOCKED}hgrehghreerg.com/images/{random path}.{gif/bmp}
- http://{BLOCKED}fjfn.com/images/{random path}.{gif/bmp}
- http://{BLOCKED}ce.com/images/{random path}.{gif/bmp}
- http://{BLOCKED}rgjfrejregreg.com/images/{random path}.{gif/bmp}
- http://{BLOCKED}rejfreggrehhh.com/images/{random path}.{gif/bmp}
SOLUTION
9.800
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 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
- {8 character string} = "%Application Data%\{8 character string}\{8 character string}.exe"
- {8 character string} = "%Application Data%\{8 character string}\{8 character string}.exe"
Step 5
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}
- {GUID}
Step 6
Search and delete this file
- %User Temp%\{random folder name}\{random filename}.bat
- %Application Data%\{8 character string}\{8 character string}.exe
Step 7
Restart in normal mode and scan your computer with your Trend Micro product for files detected as TSPY_URSNIF.YHN. 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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