TSPY_URSNIF.DC
TrojanSpy:Win32/Ursnif.gen!K (Microsoft), Backdoor.Win32.Papras.fqm (Kaspersky), Trojan.Gen.2 (Symantec), Generic PWS.y!1kg (NAI), Trojan.Generic.7772210 (FSecure), Trojan.Win32.Generic!BT (Sunbelt), W32/Papras.FQM!tr.bdr (Fortinet), Backdoor.Win32.Papras (Ikarus), a variant of Win32/Kryptik.AIZZ trojan (NOD32)
Windows 2000, Windows XP, Windows Server 2003
Threat Type: Spyware
Destructiveness: No
Encrypted: Yes
In the wild: Yes
OVERVIEW
This spyware arrives as a file that exports the functions of other malware/grayware. It arrives on a system as a file dropped by other malware or as a file downloaded unknowingly by users when visiting malicious sites. It arrives as a component bundled with malware/grayware packages.
It executes commands from a remote malicious user, effectively compromising the affected system. However, as of this writing, the said sites are inaccessible.
It modifies the Internet Explorer Zone Settings.
It attempts to steal sensitive online banking information, such as user names and passwords. This routine risks the exposure of the user's account information, which may then lead to the unauthorized use of the stolen data.
It sends the information it gathers to remote users via HTTP Post.
It requires its main component to successfully perform its intended routine.
TECHNICAL DETAILS
Arrival Details
This spyware arrives as a file that exports the functions of other malware/grayware.
It arrives on a system as a file dropped by other malware or as a file downloaded unknowingly by users when visiting malicious sites.
It arrives as a component bundled with malware/grayware packages.
Installation
This spyware adds the following mutexes to ensure that only one of its copies runs at any one time:
- {GUID}
It injects itself into the following processes as part of its memory residency routine:
- Explorer.exe
Other System Modifications
This spyware adds the following registry entries as part of its installation routine:
HKEY_CURRENT_USER\Software\Microsoft\
Internet Explorer\Main
NoProtectedModeBanner = 1
HKEY_CURRENT_USER\Software\Microsoft\
Windows\CurrentVersion\Internet Settings\
Zones\3
2500 = 3
HKEY_CURRENT_USER\Software\AppDataLow\
{b40c9685-9620-52ff-8952-cda6a35487c8}
k1 = {random number}
HKEY_CURRENT_USER\Software\AppDataLow\
{b40c9685-9620-52ff-8952-cda6a35487c8}
k2 = {random number}
HKEY_CURRENT_USER\Software\AppDataLow\
{b40c9685-9620-52ff-8952-cda6a35487c8}
Version = 28
Backdoor Routine
This spyware executes the following commands from a remote malicious user:
- Archive and upload files
- Capture screenshot
- Update/Download a configuration file
- Download and Execute other files
- Start and Stop a SOCKS proxy
- Reboot the affected system
- Clear cookies
- Steal certificates and cookies
- Retrieve log file with the stolen information
- List running process
It connects to the following URL(s) to send and receive commands from a remote malicious user:
- {BLOCKED}zna.com.tw
- {BLOCKED}i.com.tw
- {BLOCKED}.{BLOCKED}.146.103
- {BLOCKED}.{BLOCKED}.56.242
- {BLOCKED}.{BLOCKED}.47.173
However, as of this writing, the said sites are inaccessible.
Web Browser Home Page and Search Page Modification
This spyware modifies the Internet Explorer Zone Settings.
Information Theft
This spyware attempts to steal sensitive online banking information, such as user names and passwords. This routine risks the exposure of the user's account information, which may then lead to the unauthorized use of the stolen data.
It injects itself into the following web browsers to monitor searches made by the user on the following search engines:
- Chrome
- Firefox
- Internet Explorer
- Safari
- Opera
Drop Points
This spyware sends the information it gathers to remote users via HTTP Post.
Other Details
This spyware requires its main component to successfully perform its intended routine.
SOLUTION
Step 1
For Windows XP and Windows Server 2003 users, before doing any scans, please make sure you disable System Restore to allow full scanning of your computer.
Step 2
Restart in Safe Mode
Step 3
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\Internet Explorer\Main
- NoProtectedModeBanner = 1
- NoProtectedModeBanner = 1
- In HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Internet Settings\Zones\3
- 2500 = 3
- 2500 = 3
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
- {b40c9685-9620-52ff-8952-cda6a35487c8}
- {b40c9685-9620-52ff-8952-cda6a35487c8}
Step 5
Reset Internet security settings
Step 6
Restart in normal mode and scan your computer with your Trend Micro product for files detected as TSPY_URSNIF.DC. 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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