Analysis by: Clive Fuentebella
ALIASES:

Trojan-Spy.Win32.Noon.auiw (KASPERSKY)

 PLATFORM:

Windows

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

  • Threat Type: Trojan Spy

  • Destructiveness: No

  • Encrypted: Yes

  • 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.

  TECHNICAL DETAILS

File Size: 1,245,184 bytes
File Type: EXE
Memory Resident: Yes
Initial Samples Received Date: 28 May 2020

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 Profile%\Mysell1\Sirkivgtt.exe
  • %User Profile%\Mysell1\Sirkivgtt.vbs

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

It adds the following processes:

  • {Malware file name and path}
  • %User Profile%\Mysell1\Sirkivgtt.exe

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

Autostart Technique

This Trojan Spy creates the following registry entries to enable automatic execution of dropped component at every system startup:

HKEY_CURRENT_USER\Software\Microsoft\
Windows\CurrentVersion\RunOnce
SSKENDE = %User Profile%\Mysell1\Sirkivgtt.vbs

Other Details

This Trojan Spy connects to the following possibly malicious URL:

  • http://ocsp.{BLOCKED}i.goog/gsr2/ME4wTDBKMEgwRjAJBgUrDgMCGgUABBTgXIsxbvr2lBkPpoIEVRE6gHlCnAQUm%2BIHV2ccHsBqBt5ZtJot39wZhi4CDQHjtJqhjYqpgSVpULg%3D
  • http://ocsp.{BLOCKED}i.goog/gts1o1/MFEwTzBNMEswSTAJBgUrDgMCGgUABBRCRjDCJxnb3nDwj%2Fxz5aZfZjgXvAQUmNH4bhDrz5vsYJ8YkBug630J%2FSsCEFb63M0OvvAcCAAAAABDVec%3D

  SOLUTION

Minimum Scan Engine: 9.850
FIRST VSAPI PATTERN FILE: 15.940.02
FIRST VSAPI PATTERN DATE: 19 Jun 2020
VSAPI OPR PATTERN File: 15.941.00
VSAPI OPR PATTERN Date: 20 Jun 2020

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

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

[ Learn More ]

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\RunOnce
    • SSKENDE = %User Profile%\Mysell1\Sirkivgtt.vbs

Step 5

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 Profile%\Mysell1\Sirkivgtt.exe
  • %User Profile%\Mysell1\Sirkivgtt.vbs

Step 6

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