- Threat Encyclopedia
- Malware
- TSPY_URSNIF.YNJ
TrojanSpy:Win32/Ursnif.gen!K (Microsoft)
Windows 2000, Windows Server 2003, Windows XP (32-bit, 64-bit), Windows Vista (32-bit, 64-bit), Windows 7 (32-bit, 64-bit)
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 deletes the initially executed copy of itself.
Varies
EXE
Yes
25 Mar 2014
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 the following copies of itself into the affected system:
(Note: %All Users Profile% is the All Users or Common profile folder, which is C:\Documents and Settings\All Users in Windows 2000, XP, and Server 2003, and C:\ProgramData in Windows Vista and 7.)
It drops the following component file(s):
(Note: %System% is the Windows system folder, which is usually C:\Windows\System32.)
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
{random file name} = "%All Users Profile%\Application Data\{random file name}.exe"
Other System Modifications
This spyware adds the following registry keys:
HKEY_CURRENT_USER\SOFTWARE\Microshit
It adds the following registry entries:
HKEY_LOCAL_MACHINE\System\CurrentControlSet\
Control\Session Manager\AppCertDlls
{random file name} = "%System%\{random file name 2}.dll"
Stolen Information
This spyware sends the gathered information via HTTP POST to the following URL:
Other Details
This spyware deletes the initially executed copy of itself
NOTES:
It hooks the following WININET.DLL exported functions when the DLL component is loaded in IEXPLORE.EXE to monitor network traffic:
It hooks the following NSS3.DLL exported functions when the DLL component is loaded in FIREFOX.EXE to monitor network traffic:
It hooks the following WS2_32.DLL and KERNEL32.DLL exported functions when the DLL component is loaded in CHROME.EXE to monitor network traffic:
9.700
10.686.01
25 Mar 2014
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
Identify and terminate files detected as TSPY_URSNIF.YNJ
Step 3
Delete this registry key
=Important: Editing the Windows Registry incorrectly can lead to irreversible system malfunction. Please do this only if you know how to or you can seek your system administrator’s help. You may also check out this Microsoft article first before modifying your computer's registry.
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.
Step 5
Restart in normal mode and scan your computer with your Trend Micro product for files detected as TSPY_URSNIF.YNJ. 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.