Analysis by: Khristian Joseph Morales
ALIASES:

Trojan:PowerShell/BynocoLNK.BEOE!MTB (MICROSOFT)

 PLATFORM:

Windows

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

  • Threat Type: Trojan

  • Destructiveness: No

  • Encrypted:

  • In the wild: Yes

  OVERVIEW

This Trojan 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: 2,638 bytes
File Type: LNK
Memory Resident: No
Initial Samples Received Date: 19 May 2022

Arrival Details

This Trojan 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 adds the following folders:

  • %AppDataLocal%\BEhFcGmnp

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

It adds the following processes:

  • "%System%\cmd.exe" /v:on /c {encoded base 64}||goto&p^o^w^e^r^s^h^e^l^l.e^x^e -c "&{$kRMaFO='{encoded base 64}';$hLTAQy='{encoded base 64}';$RY=[System.Convert]::FromBase64String($kRMaFO+$hLTAQy);$vZ=[System.Text.Encoding]::ASCII.GetString($RY); iex ($vZ)}"
  • powershell.exe -c "&{$kRMaFO='{encoded base 64}';$hLTAQy='{encoded base 64}';$RY=[System.Convert]::FromBase64String($kRMaFO+$hLTAQy);$vZ=[System.Text.Encoding]::ASCII.GetString($RY); iex ($vZ)}"
  • "%System%\regsvr32.exe" %User Temp%\..\BEhFcGmnp\IfcziNlbBL.EnA

(Note: %System% is the Windows system folder, where it usually is C:\Windows\System32 on all Windows operating system versions.. %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).)

Download Routine

This Trojan saves the files it downloads using the following names:

  • %AppDataLocal%\BEhFcGmnp\IfcziNlbBL.EnA

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

Other Details

This Trojan connects to the following possibly malicious URL:

  • http://{BLOCKED}-shoshi.main.jp/yamada-shoshi/lg1/
  • http://{BLOCKED}ign.nl/libraries/c8NvFU14/
  • https://{BLOCKED}ation-esisa.fr/css/iU2SYlfYxsk/
  • http://{BLOCKED}g.uz/Docs/1kj8refeLdotQee2f/
  • http://{BLOCKED}imarlik.com.tr/wp-admin/9IW7L1gKwWOoNQREJ6/
  • http://{BLOCKED}lustphtravel.com/cgi-bin/QphfoQq4t/