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TrojanSpy.Win32.URSNIF.TIABOEBV

June 18, 2019
 Analysis by: Arvin Roi Macaraeg
 ALIASES:

Trojan.Win32.Fakap.psg(KASPERSKY); Trojan:Win32/Wacatac.B!ml(Microsoft)

 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

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 deletes itself after execution.

  TECHNICAL DETAILS

File Size:

620,032 bytes

File Type:

EXE

Memory Resident:

Yes

Initial Samples Received Date:

17 Jun 2019

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 copies of itself into the affected system:

  • %Application Data%\Microsoft\{random character}\{random character}.exe

(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:

  • cmd /C "nslookup myip.{BLOCKED}s.com resolver1.{BLOCKED}s.com > %User Temp%\{random 4 character}.bi1"
  • cmd /C "echo -------- >> %User Temp%\{random 4 character}.bi1"

It creates the following folders:

  • %Application Data%\Microsoft\B{random character}

(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).)

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
authtlib = "%Application Data%\Microsoft\{random charcacter}\{random character}.exe"

Dropping Routine

This Trojan Spy drops the following files:

  • %User Temp%\{random 4 character}.bi1
  • %User Temp%\{random 4 character}.bin1

(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).)

Other Details

This Trojan Spy connects to the following possibly malicious URL:

  • http://{BLOCKED}lfind.at/images/XM3IQ1JExq/ryC2D8Jpffaq43wox/2axNTsIkWOhA/eFYbue3mLri/8JzqKHuLmKh6cv/wJ0OvvpLlYnhBIgOs_2BA/Zb_2BahKdFrJTh4C/uc5YWK67Jfh9WCk/7rA5C5yLZcU4Ns8yic/rkuqxF7Ab/Sdtl_2F3wM5tvhyjCiYI/Ny5JmI9vkOTyrqMEGoL/9okRZ7GKF7UEez/u9.jpeg
  • http://{BLOCKED}-medicine.at
  • http://{BLOCKED}uption.ru

It deletes itself after execution.

  SOLUTION

Minimum Scan Engine:

9.850

FIRST VSAPI PATTERN FILE:

15.180.02

FIRST VSAPI PATTERN DATE:

17 Jun 2019

VSAPI OPR PATTERN File:

15.181.00

VSAPI OPR PATTERN Date:

18 Jun 2019

Step 1

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 2

Restart in Safe Mode

[ Learn More ]

Step 3

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

[ 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 4

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\Microsoft\Windows\CurrentVersion\Run
    • authlib = "%Application Data%\Microsoft\{random character}\{random character}.exe"

Step 5

Search and delete these components

[ Learn More ]
There may be some components 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 4 character}.bi1
  • %User Temp%\{random 4 character}.bin1

Step 6

Search and delete this folder

[ 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 character}

Step 7

Restart in normal mode and scan your computer with your Trend Micro product for files detected as TrojanSpy.Win32.URSNIF.TIABOEBV. 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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