TrojanSpy.Win32.URSNIF.TIABOEEG

March 26, 2020
 Analysis by: Patrick Noel Collado
 ALIASES:

TrojanSpy:Win32/Ursnif!MTB (Microsoft), Win32:CrypterX-gen [Trj] (Avast)

 PLATFORM:

Windows

 OVERALL RISK RATING:
 DAMAGE POTENTIAL:
 DISTRIBUTION POTENTIAL:
 REPORTED INFECTION:
 INFORMATION EXPOSURE:

  • Threat Type: Trojan Spy

  • Destructiveness: No

  • Encrypted:

  • In the wild: Yes

  OVERVIEW

Infection Channel:

Downloaded from the Internet, Dropped by other malware

This Trojan Spy arrives on a system as a file dropped by other malware or as a file downloaded unknowingly by users when visiting malicious sites.

It steals certain information from the system and/or the user.

  TECHNICAL DETAILS

File Size:

937,984 bytes

File Type:

DLL

Memory Resident:

Yes

Initial Samples Received Date:

15 Mar 2020

Payload:

Connects to URLs/IPs, Steals information

Arrival Details

This Trojan Spy 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 Trojan Spy drops the following files:

  • %User Temp%\{random}.bl1

(Note: %User Temp% is the current user's Temp folder, which is usually C:\Documents and Settings\{user name}\Local Settings\Temp on Windows 2000(32-bit), XP, and Server 2003(32-bit), or C:\Users\{user name}\AppData\Local\Temp on Windows Vista, 7, 8, 8.1, 2008(64-bit), 2012(64-bit) and 10(64-bit).)

It drops the following copies of itself into the affected system:

  • %Application Data%\Microsoft\{random}\{random}.dll

(Note: %Application Data% is the current user's Application Data folder, which is usually C:\Documents and Settings\{user name}\Application Data on Windows 2000(32-bit), XP, and Server 2003(32-bit), or C:\Users\{user name}\AppData\Roaming on Windows Vista, 7, 8, 8.1, 2008(64-bit), 2012(64-bit) and 10(64-bit).)

It adds the following processes:

  • systeminfo.exe
  • nslookup myip.{BLOCKED}s.com resolver1.{BLOCKED}s.com
  • nslookup {BLOCKED}.{BLOCKED}.0.1
  • tasklist.exe
  • driverquery.exe

It creates the following folders:

  • &Application Data%\Microsoft\{random}

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 Trojan Spy adds the following registry entries to enable its automatic execution at every system startup:

HKEY_CURRENT_USER\Software\Microsoft\
Windows\CurrentVersion\Run
{random} = rundll32 "%Application Data%\Microsoft\{random}\{random}.dll",DllRegisterServer

Other System Modifications

This Trojan Spy adds the following registry entries:

HKEY_CURRENT_USER\Software\AppDataLow\
Software\Microsoft\{GUID}
Client = {Hex Values}

HKEY_CURRENT_USER\Software\AppDataLow\
Software\Microsoft\{GUID}
Client32 = {Hex Values}

Information Theft

This Trojan Spy steals the following information:

  • User Name
  • Host Name
  • OS Name
  • OS Version
  • OS Manufacturer
  • OS Configuration
  • OS Build type
  • Registered Owner
  • Registered Organization
  • Product ID
  • Original Install Date
  • System Boot Time
  • System Manufacturer
  • System Model
  • System Type
  • Hardware information
  • List of devices on the network
  • Processes currently running
  • List of installed drivers
  • User Credentials from Browsers

It attempts to steal stored email credentials from the following:

  • Outlook
  • Thunderbird
  • Live Mail

Stolen Information

This Trojan Spy sends the gathered information via HTTP POST to the following URL:

  • {BLOCKED}erdata.at
  • get.{BLOCKED}ttburton.com

  SOLUTION

Minimum Scan Engine:

9.850

FIRST VSAPI PATTERN FILE:

15.744.03

FIRST VSAPI PATTERN DATE:

13 Mar 2020

VSAPI OPR PATTERN File:

15.745.00

VSAPI OPR PATTERN Date:

14 Mar 2020

Step 1

Trend Micro Predictive Machine Learning detects and blocks malware at the first sign of its existence, before it executes on your system. When enabled, your Trend Micro product detects this malware under the following machine learning name:

    Troj.Win32.TRX.XXPE50FFF034

Step 2

Before doing any scans, Windows 7, Windows 8, Windows 8.1, and Windows 10 users must disable System Restore to allow full scanning of their computers.

Step 3

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 4

Identify and terminate files detected as TrojanSpy.Win32.URSNIF.TIABOEEG

[ Learn More ]
  1. Windows Task Manager may not display all running processes. In this case, please use a third-party process viewer, preferably Process Explorer, to terminate the malware/grayware/spyware file. You may download the said tool here.
  2. If the detected file is displayed in either Windows Task Manager or Process Explorer but you cannot delete it, restart your computer in safe mode. To do this, refer to this link for the complete steps.
  3. If the detected file is not displayed in either Windows Task Manager or Process Explorer, continue doing the next steps.

Step 5

Delete this registry value

[ Learn More ]

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}
    • Client32 = {Hex Values}
  • In HKEY_CURRENT_USER\Software\AppDataLow\Software\Microsoft\{GUID}
    • Client = {Hex Values}
  • In HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Run
    • {Random} = rundll32 "%Application Data%\Microsoft\{Random}\{Random}.dll",DllRegisterServer

Step 6

Search and delete this file

[ Learn More ]
There may be some files that are hidden. Please make sure you check the Search Hidden Files and Folders checkbox in the "More advanced options" option to include all hidden files and folders in the search result.
  • %User Temp%\{random}.bl1
  • %Application Data%\Microsoft\{random}\{random}.dll

Step 7

Search and delete these folders

[ Learn More ]
Please make sure you check the Search Hidden Files and Folders checkbox in the More advanced options option to include all hidden folders in the search result.
  • %Application Data%\Microsoft\{random}

Step 8

Scan your computer with your Trend Micro product to delete files detected as TrojanSpy.Win32.URSNIF.TIABOEEG. 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 the following Trend Micro Support pages for more information:


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