Trojan.LNK.EMOTET.YJCD2

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.

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 drops the following files:

• %User Temp%\rzsPrHsBem.ps1

(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 adds the following processes:

• %System%\cmd.exe /v:on /c {filename}.lnk||goto&p^o^w^e^r^s^h^e^l^l.e^x^e -c "&{[System.Text.Encoding]::ASCII.GetString([System.Convert]::FromBase64String('{encoded base 64}')) > "%User Temp%\rzsPrHsBem.ps1"; powershell -executionpolicy bypass -file "%User Temp%\rzsPrHsBem.ps1"; Remove-Item -Force "%User Temp%\rzsPrHsBem.ps1"
• powershell.exe -c "&{[System.Text.Encoding]::ASCII.GetString([System.Convert]::FromBase64String('{encoded base 64}')) > "%User Temp%\rzsPrHsBem.ps1"
• %System%\WindowsPowerShell\v1.0\powershell.exe" -executionpolicy bypass -file %User Temp%\rzsPrHsBem.ps1

(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 System Modifications

This Trojan deletes the following files:

• %User Temp%\rzsPrHsBem.ps1

(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).)

Download Routine

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

• %User Temp%\pFXxlnhRVh.pRK

(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 connects to the following possibly malicious URL:

• http://{BLOCKED}technologies.com.pk/apitest/1r8uV/
• http://{BLOCKED}u.vn/components/gMXyb7/
• https://www.{BLOCKED}teldiligencias.com.mx/api/ga/
• http://www.{BLOCKED}te.cmru.ac.th/web53photo/anKeOTOIYXxzOtlIS9D/
• http://{BLOCKED}rup.dk/modlogan/DAbeNM/
• http://{BLOCKED}e.me/wp-content/DTN/